refactor: NCS-8 removed Context and replaced it with History (#6 )

Reviewed-on: #6
ci: bump version with Build-18
2026-03-28 18:08:55 +01:00 · 2026-03-28 12:39:59 +00:00 · 2026-03-28 13:35:49 +01:00 · 2026-03-27 09:25:13 +00:00 · 2026-03-25 08:48:49 +01:00 · 2026-03-25 08:19:43 +01:00
54 changed files with 1320 additions and 5533 deletions
@@ -1,120 +0,0 @@
 # Claude Code – Working Agreement
 ## Workflow: Plan → Write Tests → Implement → Verify
 ### 1. Plan First
 Before writing any code, produce an explicit plan:
 - Restate the requirement in your own words to confirm understanding.
 - List every file you intend to create or modify.
 - Identify risks or unknowns upfront.
 - Wait for confirmation **only** when the plan reveals an ambiguity that cannot be resolved from context. Otherwise proceed immediately.
 ### 2. Write Tests
 Before implementing, write tests that should cover the new behaviour.
 Only write tests for the new behaviour.
 ### 3. Implement
 Follow the plan. Do not add scope beyond what was agreed.
 ### 4. Verify Every Requirement
 After implementation, go through each requirement one-by-one and confirm it is satisfied:
 - Run the relevant tests (unit, integration, or build check) for every changed module.
 - If a requirement **cannot** be fulfilled, do **not** silently skip it — document it immediately (see *Unresolved Requirements* below).
 ---
 ## No Code Without Verification (Testing)
 - Every new behaviour must be covered by at least one automated test before the task is considered done.
 - Every bug fix must be accompanied by a regression test that fails before the fix and passes after.
 - Run `./gradlew :modules:<module>:test` (or the appropriate Gradle task) and confirm a green build before marking work complete.
 - If a test cannot be written for a legitimate reason, document it in `docs/unresolved.md` with an explanation.
 ---
 ## Automatic Bug Fixing
 - When a test or build step fails, attempt to fix the root cause immediately — do **not** ask for permission.
 - Apply the fix, re-run the verification, and continue until green.
 - If the same failure persists after **three** fix attempts, stop, log the issue in `docs/unresolved.md`, and surface a concise summary.
 ---
 ## Unresolved Requirements → `docs/unresolved.md`
 When a requirement or bug cannot be resolved, append an entry to `docs/unresolved.md`:
 ```markdown
 ## [YYYY-MM-DD] <Short title>
 **Requirement / Bug:**
 <What was requested or what failed>
 **Root Cause (if known):**
 <Why it cannot be resolved right now>
 **Attempted Fixes:**
 1. <What was tried>
 2. …
 **Suggested Next Step:**
 <What a human engineer should investigate>
 ```
 Create the file if it does not exist. Never delete existing entries.
 ---
 ## Project Structure
 ```
 .                        ← Repository root (multi-project Gradle setup)
 ├── build.gradle.kts     ← Root build file (shared plugins, dependency versions)
 ├── settings.gradle.kts  ← Gradle settings (declares all subprojects)
 ├── modules/             ← One subdirectory per microservice
 │   └── <service>/
 │       ├── build.gradle.kts
 │       └── src/
 └── docs/                ← Architecture Decision Records, API docs, unresolved issues
    └── unresolved.md
 ```
 ### Conventions
 - All microservices live under `modules/{service-name}`. Never place service code in the root.
 - Shared configuration (dependency versions, plugin setup) belongs in the **root** `build.gradle.kts` or in `buildSrc` / a version catalog.
 - `settings.gradle.kts` must include every module via `include(":modules:<service>")`.
 - Architecture decisions go in `docs/adr/` as numbered Markdown files (`ADR-001-<title>.md`).
 - API contracts live in `/docs/api/`.
 - Unit tests extend `AnyFunSuite with Matchers with JUnitSuiteLike` — no `@Test` annotations, no `: Unit` requirement
 - Integration tests use `@QuarkusTest` with JUnit 5 — `@Test` methods must be explicitly typed `: Unit`
 - Always exclude scala-library from Quarkus deps to avoid Scala 2 conflicts
 ## Coverage Conventions
 - Branch coverage must be at least 90% - unless there is a good reason not to.
 - Line coverage must be at least 95% - unless there is a good reason not to.
 - Method coverage must be at least 90% - unless there is a good reason not to.
 - To check coverage use jacoco-reporter/scoverage_coverage_gaps.py modules/{service}/build/reports/scoverageTest/scoverage.xml
 - IMPORTANT: modules/{service}/build/reports/scoverage/scoverage.xml is not used for coverage TEST calculation. Do not use it.
 ## Agent Routing Rules
 ### Use agents in PARALLEL when:
 - Tasks touch different, independent microservices
 - No shared files or state between tasks
 - Example: "implement service-user AND service-orders simultaneously"
 ### Use agents SEQUENTIALLY when:
 - Tasks have dependencies (architect → implementer → test-writer)
 - Shared API contracts are involved
 - Example: design API first, then implement, then test
 ## Quick-Reference Checklist
 Before considering any task done, confirm:
 - [ ] Plan was written and requirements restated
 - [ ] All planned files were created / modified
 - [ ] Automated tests cover the new behaviour
 - [ ] `./gradlew build` (or scoped task) is green
 - [ ] Each requirement has been explicitly verified
 - [ ] Any unresolved items are logged in `docs/unresolved.md`
@@ -23,7 +23,7 @@ report findings to team-leader, who re-invokes scala-implementer for fixes.
 - `@QuarkusTest` methods (JUnit 5) must be explicitly typed `: Unit`
 ### Tests
- Unit tests must extend `AnyFunSuite with Matchers with JUnitSuiteLike`, not plain JUnit 5
+- Unit tests must extend `AnyFunSuite with Matchers`
 - Integration tests use `@QuarkusTest` with JUnit 5 `@Test` methods
 - No raw `@Test` annotations on plain unit test classes
@@ -0,0 +1,9 @@
 # Memory Index
 ## Feedback
 - [feedback_keep_structure_updated.md](feedback_keep_structure_updated.md) — Update structure memory files whenever source files are added, removed, or changed
 ## Project Structure
 - [project_structure_root.md](project_structure_root.md) — Top-level layout, modules list, VERSIONS map, navigation rules (skip `build/`, `.gradle/`, `.idea/`)
 - [project_structure_api.md](project_structure_api.md) — `modules/api`: all files and types (Board, Piece, Square, GameState, Move, ApiResponse, PlayerInfo)
 - [project_structure_core.md](project_structure_core.md) — `modules/core`: all files and types (GameContext, GameRules, MoveValidator, GameController, Parser, Renderer)
@@ -0,0 +1,16 @@
 ---
 name: keep-structure-memory-updated
 description: Always update the project structure memory files when adding, removing, or changing source files
 type: feedback
 ---
 After any change that adds, removes, renames, or significantly alters a source file, update the relevant structure memory file:
 - New/renamed/deleted file in `modules/api` → update `project_structure_api.md`
 - New/renamed/deleted file in `modules/core` → update `project_structure_core.md`
 - New module, dependency version change, or new top-level directory → update `project_structure_root.md`
 - New module added → create a new `project_structure_<module>.md` and add it to `MEMORY.md`
 **Why:** Structure memories are the primary navigation aid. Stale entries cause wasted exploration.
 **How to apply:** Treat the structure memory update as part of completing any implementation task — do it in the same session, not as a follow-up.
@@ -0,0 +1,51 @@
 ---
 name: module-api-structure
 description: File and type overview for the modules/api module (shared domain types)
 type: project
 ---
 # Module: `modules/api`
 **Purpose:** Shared domain model — pure data types with no game logic. Depended on by `modules/core`.
 **Gradle:** `id("scala")`, no `application` plugin. No Quarkus. Uses scoverage plugin.
 **Package root:** `de.nowchess.api`
 ## Source files (`src/main/scala/de/nowchess/api/`)
 ### `board/`
 | File | Contents |
 |------|----------|
 | `Board.scala` | `opaque type Board = Map[Square, Piece]` — extensions: `pieceAt`, `withMove`, `pieces`; `Board.initial` sets up start position |
 | `Color.scala` | `enum Color { White, Black }` — `.opposite`, `.label` |
 | `Piece.scala` | `case class Piece(color, pieceType)` — convenience vals `WhitePawn`…`BlackKing` |
 | `PieceType.scala` | `enum PieceType { Pawn, Knight, Bishop, Rook, Queen, King }` — `.label` |
 | `Square.scala` | `enum File { A–H }`, `enum Rank { R1–R8 }`, `case class Square(file, rank)` — `.toString` algebraic, `Square.fromAlgebraic(s)` |
 ### `game/`
 | File | Contents |
 |------|----------|
 | `GameState.scala` | `case class CastlingRights(kingSide, queenSide)` + `.None`/`.Both`; `enum GameResult { WhiteWins, BlackWins, Draw }`; `enum GameStatus { NotStarted, InProgress, Finished(result) }`; `case class GameState(piecePlacement, activeColor, castlingWhite, castlingBlack, enPassantTarget, halfMoveClock, fullMoveNumber, status)` — FEN-compatible snapshot |
 ### `move/`
 | File | Contents |
 |------|----------|
 | `Move.scala` | `enum PromotionPiece { Knight, Bishop, Rook, Queen }`; `enum MoveType { Normal, CastleKingside, CastleQueenside, EnPassant, Promotion(piece) }`; `case class Move(from, to, moveType = Normal)` |
 ### `player/`
 | File | Contents |
 |------|----------|
 | `PlayerInfo.scala` | `opaque type PlayerId = String`; `case class PlayerInfo(id: PlayerId, displayName: String)` |
 ### `response/`
 | File | Contents |
 |------|----------|
 | `ApiResponse.scala` | `sealed trait ApiResponse[+A]` → `Success[A](data)` / `Failure(errors)`; `case class ApiError(code, message, field?)`; `case class Pagination(page, pageSize, totalItems)` + `.totalPages`; `case class PagedResponse[A](items, pagination)` |
 ## Test files (`src/test/scala/de/nowchess/api/`)
 Mirror of main structure — one `*Test.scala` per source file using `AnyFunSuite with Matchers`.
 ## Notes
 - `GameState` is FEN-style but `Board` (in `core`) is a `Map[Square,Piece]` — the two are separate representations
 - `CastlingRights` is defined here in `api`; the castling logic lives in `core`
@@ -0,0 +1,48 @@
 ---
 name: module-core-structure
 description: File and type overview for the modules/core module (TUI chess engine)
 type: project
 ---
 # Module: `modules/core`
 **Purpose:** Standalone TUI chess application. All game logic, move validation, rendering. Depends on `modules/api`.
 **Gradle:** `id("scala")` + `application` plugin. Main class: `de.nowchess.chess.Main`. Uses scoverage plugin.
 **Package root:** `de.nowchess.chess`
 ## Source files (`src/main/scala/de/nowchess/chess/`)
 ### Root
 | File | Contents |
 |------|----------|
 | `Main.scala` | Entry point — prints welcome, starts `GameController.gameLoop(GameContext.initial, Color.White)` |
 ### `controller/`
 | File | Contents |
 |------|----------|
 | `GameController.scala` | `sealed trait MoveResult` ADT: `Quit`, `InvalidFormat`, `NoPiece`, `WrongColor`, `IllegalMove`, `Moved`, `MovedInCheck`, `Checkmate`, `Stalemate`; `object GameController` — `processMove(ctx, turn, raw): MoveResult` (pure), `gameLoop(ctx, turn)` (I/O loop), `applyRightsRevocation(...)` (castling rights bookkeeping) |
 | `Parser.scala` | `object Parser` — `parseMove(input): Option[(Square, Square)]` parses coordinate notation e.g. `"e2e4"` |
 ### `logic/`
 | File | Contents |
 |------|----------|
 | `GameContext.scala` | `enum CastleSide { Kingside, Queenside }`; `case class GameContext(board, whiteCastling, blackCastling)` — `.castlingFor(color)`, `.withUpdatedRights(color, rights)`; `GameContext.initial`; `extension (Board).withCastle(color, side)` moves king+rook atomically |
 | `GameRules.scala` | `enum PositionStatus { Normal, InCheck, Mated, Drawn }`; `object GameRules` — `isInCheck(board, color)`, `legalMoves(ctx, color): Set[(Square,Square)]`, `gameStatus(ctx, color): PositionStatus` |
 | `MoveValidator.scala` | `object MoveValidator` — `isLegal(board, from, to)`, `legalTargets(board, from): Set[Square]` (board-only, no castling), `legalTargets(ctx, from)` (context-aware, includes castling), `isCastle`, `castleSide`, `castlingTargets(ctx, color)` — full castling legality (empty squares, no check through transit) |
 ### `view/`
 | File | Contents |
 |------|----------|
 | `Renderer.scala` | `object Renderer` — `render(board): String` outputs ANSI-colored board with file/rank labels |
 | `PieceUnicode.scala` | `extension (Piece).unicode: String` maps each piece to its Unicode chess symbol |
 ## Test files (`src/test/scala/de/nowchess/chess/`)
 Mirror of main structure — one `*Test.scala` per source file using `AnyFunSuite with Matchers`.
 ## Key design notes
 - `MoveValidator` has two overloaded `legalTargets`: one takes `Board` (geometry only), one takes `GameContext` (adds castling)
 - `GameRules.legalMoves` filters by check — it calls `MoveValidator.legalTargets(ctx, from)` then simulates each move
 - Castling rights revocation is in `GameController.applyRightsRevocation`, triggered after every move
 - No `@QuarkusTest` — this module is a plain Scala application, not a Quarkus service
@@ -0,0 +1,55 @@
 ---
 name: project-root-structure
 description: Top-level project structure, modules list, and navigation notes for NowChessSystems
 type: project
 ---
 # NowChessSystems — Root Structure
 ## Directory layout (skip `build/`, `.gradle/`, `.idea/`)
 ```
 NowChessSystems/
 ├── build.gradle.kts          # Root: sonarqube plugin, VERSIONS map
 ├── settings.gradle.kts       # include(":modules:core", ":modules:api")
 ├── gradlew / gradlew.bat
 ├── CLAUDE.md                 # Project instructions for Claude Code
 ├── .claude/
 │   ├── CLAUDE.MD             # Working agreement (plan/verify/unresolved)
 │   ├── settings.json
 │   └── agents/               # architect, code-reviewer, gradle-builder, scala-implementer, test-writer
 ├── docs/
 │   ├── Claude-Skills.md
 │   ├── Security.md
 │   └── unresolved.md
 ├── jacoco-reporter/          # Python scripts for coverage gap reporting
 └── modules/
    ├── api/                  # Shared domain types (no logic)
    └── core/                 # TUI chess engine + game logic
 ```
 ## Modules
 | Module | Gradle path | Purpose |
 |--------|-------------|---------|
 | `api` | `:modules:api` | Shared domain model: Board, Piece, Move, GameState, ApiResponse |
 | `core` | `:modules:core` | TUI chess app: game logic, move validation, rendering |
 `core` depends on `api` via `implementation(project(":modules:api"))`.
 ## VERSIONS (root `build.gradle.kts`)
 | Key | Value |
 |-----|-------|
 | `QUARKUS_SCALA3` | 1.0.0 |
 | `SCALA3` | 3.5.1 |
 | `SCALA_LIBRARY` | 2.13.18 |
 | `SCALATEST` | 3.2.19 |
 | `SCALATEST_JUNIT` | 0.1.11 |
 | `SCOVERAGE` | 2.1.1 |
 ## Navigation rules
 - **Always skip** `build/`, `.gradle/`, `.idea/` when exploring — they are generated artifacts
 - Tests use `AnyFunSuite with Matchers` (ScalaTest), not JUnit `@Test`
 - No Quarkus in current modules — Quarkus is planned for future services
 - Agent workflow: architect → scala-implementer → test-writer → gradle-builder → code-reviewer
@@ -7,6 +7,6 @@
    </profile>
  </component>
  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+    <mapping directory="" vcs="Git" />
  </component>
 </project>
@@ -1,58 +1,58 @@
-# CLAUDE.md
+# CLAUDE.md — NowChessSystems
-This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+## Stack
 Scala 3.5.x · Quarkus + quarkus-scala3 · Hibernate/Jakarta · Lanterna TUI · K8s + ArgoCD + Kargo · Frontend TBD (Vite/React/Angular/Vue)
-## Build & Test Commands
+### Memory
 Your memory is saved under .claude/memory/MEMORY.md.
 ## Structure
 ```
 build.gradle.kts / settings.gradle.kts   # root; include(":modules:<svc>") per service
 modules/<svc>/build.gradle.kts + src/
 docs/adr/  docs/api/  docs/unresolved.md
 ```
 Versions in root `extra["VERSIONS"]`; modules read via `rootProject.extra["VERSIONS"] as Map<String,String>`.
 ## Commands
 ```bash
 # Build everything
 ./gradlew build
-
+./gradlew :modules:<svc>:build|test
-# Build a single module
+./gradlew :modules:<svc>:test --tests "de.nowchess.<svc>.<Class>"
 ./gradlew :modules:<service>:build
 # Run tests for a single module
 ./gradlew :modules:<service>:test
 # Run a specific test class
 ./gradlew :modules:<service>:test --tests "de.nowchess.<service>.<ClassName>"
 ```
-The only current module is `core` (`modules/core`).
+## Workflow
 1. **Plan** — restate requirement, list files, flag risks. Proceed unless genuine ambiguity.
 2. **Tests first** — cover only new behaviour.
 3. **Implement** — no scope creep.
 4. **Verify** — check each requirement; confirm green build.
-## Architecture
+## Scala/Quarkus Rules
 - `given`/`using` only (no `implicit`); `Option`/`Either`/`Try` (no `null`/`.get`)
 - `jakarta.*` only; reactive I/O (`Uni`/`Multi`), no blocking on event loop
 - Always exclude `org.scala-lang:scala-library` from Quarkus BOM
 - Unit tests: `extends AnyFunSuite with Matchers` — no `@Test`, no `: Unit`
 - Integration tests: `@QuarkusTest` + JUnit 5 — `@Test` methods need explicit `: Unit`
-**NowChessSystems** is a chess platform built as a Scala 3 + Quarkus microservice system.
+## Coverage
 Line ≥ 95% · Branch ≥ 90% · Method ≥ 90% (document exceptions)
 Check: `jacoco-reporter/scoverage_coverage_gaps.py modules/{svc}/build/reports/scoverageTest/scoverage.xml`
 ⚠️ Use `scoverageTest/`, NOT `scoverage/`.
- Multi-module Gradle project; every service lives under `modules/{service-name}`.
+## Bug Fixing
- Shared dependency versions live in the root `build.gradle.kts` under `extra["VERSIONS"]`.
+Fix failures immediately without asking. After 3 failed attempts → log in `docs/unresolved.md` + surface summary.
 - Each module reads versions via `rootProject.extra["VERSIONS"] as Map<String, String>`.
 - `settings.gradle.kts` must `include(":modules:<service>")` for every module.
-### Stack (ADR-001)
+## Agents (new service)
-| Layer | Technology |
+Sequential: architect → scala-implementer → test-writer → gradle-builder → code-reviewer (review only, no self-fix)
-|---|---|
+Parallel: only when services are fully independent (no shared contracts/state).
 | Language | Scala 3.5.x |
 | Backend framework | Quarkus + `quarkus-scala3` extension |
 | Persistence | Hibernate / Jakarta Persistence |
 | Frontend (TBD) | Vite; React/Angular/Vue under evaluation |
 | TUI | Lanterna |
 | Container orchestration | Kubernetes + ArgoCD + Kargo |
-### Key Scala 3 / Quarkus Rules
+## Unresolved (`docs/unresolved.md`)
- Use `given`/`using`, not `implicit` (no Scala 2 idioms).
+Append only, never delete:
- Use `Option`/`Either`/`Try`, never `null` or `.get`.
+```
- Jakarta annotations only (`jakarta.*`), never `javax.*`.
+## [YYYY-MM-DD] <title>
- Use reactive types (`Uni`, `Multi`) for I/O; no blocking calls on the event loop.
+**Requirement/Bug:** **Root Cause:** **Attempted Fixes:** **Next Step:**
- **Always exclude `org.scala-lang:scala-library` from Quarkus BOM** to avoid Scala 2 conflicts.
+```
 - **Unit tests use `extends AnyFunSuite with Matchers with JUnitSuiteLike`** — ScalaTest DSL, no `@Test` annotations needed.
 - **Integration tests use `@QuarkusTest` with JUnit 5** — explicit `: Unit` return type still required on `@Test` methods.
-### Agent Workflow (for new services)
+## Done Checklist
-1. **architect** → writes OpenAPI contract to `docs/api/{service}.yaml` and ADR to `docs/adr/`.
+- [ ] Plan written · files created/modified · tests green · requirements verified · unresolved logged
 2. **scala-implementer** → reads contract, implements service under `modules/{service}/`.
 3. **test-writer** → writes `@QuarkusTest` integration tests and `AnyFunSuite with Matchers with JUnitSuiteLike` unit tests.
 4. **gradle-builder** → resolves any build/dependency issues.
 5. **code-reviewer** → reviews; reports findings back without self-fixing.
 Detailed working agreement (plan/verify/unresolved workflow) is in `.claude/CLAUDE.MD`.
@@ -1,43 +0,0 @@
 # ADR-001: Technology Stack Selection
 ## Status
 Accepted
 ## Context
 The "NowChessSystems" project requires a modern, scalable,
 and maintainable technology stack to support web-based interfaces.
 The system is designed as a microservice architecture to allow for independent scaling and development of various components (e.g., engine, matchmaking, user management).
 ## Decision
 We have decided to use the following technologies for the core system:
 ### Backend
 - **Language:** [Scala 3](https://scala-lang.org/) for its powerful type system, functional programming capabilities, and seamless JVM integration.
 - **Framework:** [Quarkus](https://quarkus.io/) with the `io.quarkiverse.scala:quarkus-scala3` extension to leverage GraalVM native compilation and fast startup times.
 - **Persistence:** [Hibernate](https://hibernate.org/) and [Jakarta Persistence](https://jakarta.ee/specifications/persistence/) for standard-based ORM.
 ### Frontend
 - **Build Tool:** [Vite](https://vitejs.dev/) for a fast development experience.
 - **Framework:** TBD (Evaluation between React, Angular, and Vue).
 - **Terminal UI:** [Lanterna](https://github.com/mabe02/lanterna) for a text-based user interface (TUI).
 ### DevOps & Infrastructure
 - **Orchestration:** [Kubernetes](https://kubernetes.io/) for container orchestration.
 - **GitOps & Delivery:** [ArgoCD](https://argoproj.github.io/cd/) for continuous delivery and [Kargo](https://kargo.io/) for multi-stage lifecycle management.
 ### AI-Assisted Development
 - [Claude Code Pro](https://claude.ai/) and [Claude Agent Teams](https://claude.ai/team) for coding and reviews.
 - [Google Stitch](https://stitch.google.com/) (Free) for UI design and prototyping.
 ## Consequences
 ### Positive
 - **High Performance:** Quarkus and GraalVM enable low memory footprint and fast startup.
 - **Developer Productivity:** Scala 3 and AI tools provide a high-level, expressive environment.
 - **Robustness:** Kubernetes and ArgoCD ensure reliable deployment and scaling.
 - **Accessibility:** Offering both a TUI and a web interface caters to different user preferences.
 ### Negative / Risks
 - **Complexity:** Managing a microservices architecture with Kubernetes adds operational overhead.
 - **Learning Curve:** Scala 3 and the specific Quarkus-Scala integration may require training for new developers.
 - **Consistency:** Maintaining parity between the TUI and Web frontend functionality.
@@ -1,86 +0,0 @@
 # ADR-002: Shared-Models Library (`modules/api`)
 ## Status
 Accepted
 ## Context
 NowChessSystems is a microservice platform. As soon as two or more services need to
 exchange data — whether through REST, messaging, or internal function calls — they must
 agree on common data types. Without a shared home for those types, the same case class
 (e.g. `Square`, `Move`, `GameState`) is duplicated in every module, diverges over time,
 and causes silent serialisation mismatches at runtime.
 The `core` module currently owns the chess engine logic. Future modules (matchmaking,
 game history, user management, notation export, etc.) will all need to refer to the
 same chess domain vocabulary. A cross-cutting place to hold that vocabulary is therefore
 required before any second service is built.
 ## Decision
 We introduce `modules/api` as a **shared-models library**: a plain Scala 3 library
 (no Quarkus, no Jakarta, no persistence) that contains only:
 - Pure Scala 3 data types: `case class`, `sealed trait`, and `enum` definitions
 - Value objects that model the chess domain (pieces, colors, squares, moves, game state)
 - Cross-service API envelope types (`ApiResponse[A]`, `ApiError`, `Pagination`)
 - Minimal player/user identity stubs (IDs and display names only)
 Every service module that needs these types declares:
 ```kotlin
 implementation(project(":modules:api"))
 ```
 in its own `build.gradle.kts`. The `modules/api` module itself carries no runtime
 dependencies beyond the Scala 3 standard library.
 ### Package layout
 ```
 de.nowchess.api
 ├── board          – Color, PieceType, Piece, File, Rank, Square
 ├── game           – CastlingRights, GameState, GameResult, GameStatus
 ├── move           – MoveType, Move, PromotionPiece
 ├── player         – PlayerId, PlayerInfo
 └── response       – ApiResponse, ApiError, Pagination
 ```
 ## What belongs in `modules/api`
 | Belongs | Does NOT belong |
 |---|---|
 | `case class`, `sealed trait`, `enum` for chess domain | Quarkus `@ApplicationScoped` beans |
 | API envelope types (`ApiResponse`, `ApiError`) | Jakarta Persistence entities (`@Entity`) |
 | Player identity stubs (ID + display name) | REST resource classes |
 | FEN/board-state representation types | Business logic, engine algorithms |
 | Pure type aliases and value objects | Database queries or repositories |
 The rule of thumb: if a type carries a framework annotation or requires I/O to produce,
 it does not belong in `modules/api`.
 ## How other modules depend on it
 1. `modules/api` is a regular Gradle subproject already declared in `settings.gradle.kts`.
 2. Consuming modules add `implementation(project(":modules:api"))` — nothing else.
 3. Because `modules/api` has no Quarkus BOM, consuming modules must not re-export Quarkus
   transitive dependencies through it.
 4. If a future module needs JSON serialisation, it adds its own JSON library (e.g.
   `circe`, `jsoniter-scala`) as a dependency and derives codecs for the shared types
   there — codec derivation stays out of `modules/api`.
 ## Consequences
 ### Positive
 - Single source of truth for all chess domain vocabulary.
 - Adding a new microservice requires only one `implementation(project(":modules:api"))`
  line — no copy-paste of types.
 - The library is fast to compile (no framework processing) and cheap to test in isolation.
 - Enforces a strict boundary: if a type needs a framework annotation it is forced into the
  correct service module.
 ### Negative / Risks
 - Any breaking change to a shared type (rename, field removal) is a cross-cutting change
  that touches every consuming module simultaneously.
 - Developers must resist the temptation to add convenience methods or logic to these
  types; discipline is required to keep the library pure.
@@ -1,244 +0,0 @@
 # ScalaTest + Scoverage Migration Implementation Plan
 > **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
 **Goal:** Replace JaCoCo with Scoverage and add ScalaTest (with its JUnit 5 bridge) as the test library across all modules.
 **Architecture:** Three build files are modified — the root for shared dependency versions, and each module for plugins, dependencies, and task wiring. No source files are created. The Scoverage Gradle plugin is applied per-module with its version hardcoded inline (Gradle resolves `plugins {}` before `rootProject.extra` is available).
 **Tech Stack:** Scala 3, Gradle (Kotlin DSL), ScalaTest 3.2.19, scalatestplus-junit-5-11 3.2.19.1, Scoverage Gradle plugin 8.1.
 ---
 ## File Map
 | File | Change |
 |---|---|
 | `build.gradle.kts` (root) | Add `SCALATEST` and `SCALATESTPLUS_JUNIT5` version entries |
 | `modules/core/build.gradle.kts` | Replace `jacoco` with `org.scoverage`; swap JUnit deps for ScalaTest; merge two `tasks.test {}` blocks |
 | `modules/api/build.gradle.kts` | Same as core; also add missing `useJUnitPlatform()` |
 ---
 ### Task 1: Add ScalaTest version entries to root build
 **Files:**
 - Modify: `build.gradle.kts` (root)
 - [ ] **Step 1: Add version entries**
 Open `build.gradle.kts` at the root. The `versions` map currently looks like:
 ```kotlin
 val versions = mapOf(
    "QUARKUS_SCALA3" to "1.0.0",
    "SCALA3"         to "3.5.1",
    "SCALA_LIBRARY"  to "2.13.18"
 )
 ```
 Add two entries so it becomes:
 ```kotlin
 val versions = mapOf(
    "QUARKUS_SCALA3"        to "1.0.0",
    "SCALA3"                to "3.5.1",
    "SCALA_LIBRARY"         to "2.13.18",
    "SCALATEST"             to "3.2.19",
    "SCALATESTPLUS_JUNIT5"  to "3.2.19.1"
 )
 ```
 - [ ] **Step 2: Verify the root build file parses**
 ```bash
 ./gradlew help --quiet
 ```
 Expected: exits 0 with no errors.
 - [ ] **Step 3: Commit**
 ```bash
 git add build.gradle.kts
 git commit -m "build: add ScalaTest version entries to root versions map"
 ```
 ---
 ### Task 2: Migrate `modules/core` to ScalaTest + Scoverage
 **Files:**
 - Modify: `modules/core/build.gradle.kts`
 - [ ] **Step 1: Replace the `jacoco` plugin with `org.scoverage`**
 In the `plugins {}` block, replace:
 ```kotlin
 jacoco
 ```
 with:
 ```kotlin
 id("org.scoverage") version "8.1"
 ```
 The full plugins block should be:
 ```kotlin
 plugins {
    id("scala")
    id("org.scoverage") version "8.1"
    application
 }
 ```
 - [ ] **Step 2: Swap JUnit dependencies for ScalaTest**
 In the `dependencies {}` block, remove:
 ```kotlin
 testImplementation(platform("org.junit:junit-bom:5.10.0"))
 testImplementation("org.junit.jupiter:junit-jupiter")
 testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 ```
 Add in their place:
 ```kotlin
 testImplementation("org.scalatest:scalatest_3:${versions["SCALATEST"]!!}")
 testImplementation("org.scalatestplus:junit-5-11_3:${versions["SCALATESTPLUS_JUNIT5"]!!}")
 ```
 - [ ] **Step 3: Merge the two `tasks.test {}` blocks and replace jacoco wiring**
 The file currently has two separate `tasks.test {}` blocks and a `tasks.jacocoTestReport {}` block. Delete all three. Add the following single merged block **after** the `dependencies {}` block:
 ```kotlin
 tasks.test {
    useJUnitPlatform()
    finalizedBy(tasks.reportScoverage)
 }
 tasks.reportScoverage {
    dependsOn(tasks.test)
 }
 ```
 - [ ] **Step 4: Run the tests**
 ```bash
 ./gradlew :modules:core:test
 ```
 Expected: BUILD SUCCESSFUL. (Zero tests is fine — there are no test files yet. The build must not fail with dependency resolution or plugin errors.)
 - [ ] **Step 5: Run the coverage report**
 ```bash
 ./gradlew :modules:core:reportScoverage
 ```
 Expected: BUILD SUCCESSFUL. A report is generated under `modules/core/build/reports/scoverage/`.
 - [ ] **Step 6: Commit**
 ```bash
 git add modules/core/build.gradle.kts
 git commit -m "build(core): replace JaCoCo with Scoverage, add ScalaTest dependencies"
 ```
 ---
 ### Task 3: Migrate `modules/api` to ScalaTest + Scoverage
 **Files:**
 - Modify: `modules/api/build.gradle.kts`
 - [ ] **Step 1: Replace the `jacoco` plugin with `org.scoverage`**
 In the `plugins {}` block, replace:
 ```kotlin
 jacoco
 ```
 with:
 ```kotlin
 id("org.scoverage") version "8.1"
 ```
 The full plugins block should be:
 ```kotlin
 plugins {
    id("scala")
    id("org.scoverage") version "8.1"
 }
 ```
 - [ ] **Step 2: Swap JUnit dependencies for ScalaTest**
 In the `dependencies {}` block, remove:
 ```kotlin
 testImplementation(platform("org.junit:junit-bom:5.10.0"))
 testImplementation("org.junit.jupiter:junit-jupiter")
 testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 ```
 Add in their place:
 ```kotlin
 testImplementation("org.scalatest:scalatest_3:${versions["SCALATEST"]!!}")
 testImplementation("org.scalatestplus:junit-5-11_3:${versions["SCALATESTPLUS_JUNIT5"]!!}")
 ```
 - [ ] **Step 3: Merge the two `tasks.test {}` blocks and replace jacoco wiring**
 The `modules/api` file also has two `tasks.test {}` blocks and a `jacocoTestReport` block. Delete all three. Add the following merged block **after** the `dependencies {}` block:
 ```kotlin
 tasks.test {
    useJUnitPlatform()
    finalizedBy(tasks.reportScoverage)
 }
 tasks.reportScoverage {
    dependsOn(tasks.test)
 }
 ```
 > Note: `modules/api` did not previously have `useJUnitPlatform()` — it is being **added** here, not preserved.
 - [ ] **Step 4: Run the tests**
 ```bash
 ./gradlew :modules:api:test
 ```
 Expected: BUILD SUCCESSFUL.
 - [ ] **Step 5: Run the coverage report**
 ```bash
 ./gradlew :modules:api:reportScoverage
 ```
 Expected: BUILD SUCCESSFUL. A report is generated under `modules/api/build/reports/scoverage/`.
 - [ ] **Step 6: Commit**
 ```bash
 git add modules/api/build.gradle.kts
 git commit -m "build(api): replace JaCoCo with Scoverage, add ScalaTest dependencies"
 ```
 ---
 ### Task 4: Full build verification
 - [ ] **Step 1: Run the full build**
 ```bash
 ./gradlew build
 ```
 Expected: BUILD SUCCESSFUL with no errors across all modules.
 - [ ] **Step 2: Confirm no JaCoCo references remain**
 ```bash
 grep -r "jacoco\|jacocoTestReport" --include="*.kts" .
 ```
 Expected: no output (zero matches).
@@ -1,579 +0,0 @@
 # Chess Check / Checkmate / Stalemate Implementation Plan
 > **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
 **Goal:** Add check detection, checkmate (win by opponent having no legal reply while in check), and stalemate (draw by opponent having no legal reply while not in check) to the chess game loop.
 **Architecture:** A new `GameRules` object owns all check-aware logic; the existing `MoveValidator` keeps its geometric-only contract unchanged. `GameController.processMove` calls `GameRules.gameStatus` after each move and returns new `MoveResult` variants (`MovedInCheck`, `Checkmate`, `Stalemate`). Terminal states reset the board.
 **Tech Stack:** Scala 3.5, ScalaTest (`AnyFunSuite with Matchers`), Gradle (`:modules:core:test`)
 ---
 ## File Map
 | File | Action | Responsibility |
 |---|---|---|
 | `modules/core/src/main/scala/de/nowchess/chess/logic/GameRules.scala` | **Create** | `isInCheck`, `legalMoves`, `gameStatus`, `PositionStatus` enum |
 | `modules/core/src/test/scala/de/nowchess/chess/logic/GameRulesTest.scala` | **Create** | Unit tests for all three `GameRules` methods |
 | `modules/core/src/main/scala/de/nowchess/chess/controller/GameController.scala` | **Modify** | Add `MovedInCheck`/`Checkmate`/`Stalemate` to `MoveResult`; wire `processMove` and `gameLoop` |
 | `modules/core/src/test/scala/de/nowchess/chess/controller/GameControllerTest.scala` | **Modify** | Add `processMove` and `gameLoop` tests for the three new results |
 ---
 ## Task 1: Create `GameRules` stub
 **Files:**
 - Create: `modules/core/src/main/scala/de/nowchess/chess/logic/GameRules.scala`
 - [ ] **Step 1: Create the stub file**
 ```scala
 package de.nowchess.chess.logic
 import de.nowchess.api.board.*
 enum PositionStatus:
  case Normal, InCheck, Mated, Drawn
 object GameRules:
  /** True if `color`'s king is under attack on this board. */
  def isInCheck(board: Board, color: Color): Boolean = false
  /** All (from, to) moves for `color` that do not leave their own king in check. */
  def legalMoves(board: Board, color: Color): Set[(Square, Square)] = Set.empty
  /** Position status for the side whose turn it is (`color`). */
  def gameStatus(board: Board, color: Color): PositionStatus = PositionStatus.Normal
 ```
 - [ ] **Step 2: Verify the project compiles**
 ```bash
 ./gradlew :modules:core:compileScala
 ```
 Expected: `BUILD SUCCESSFUL`
 - [ ] **Step 3: Commit**
 ```bash
 git add modules/core/src/main/scala/de/nowchess/chess/logic/GameRules.scala
 git commit -m "feat: add GameRules stub with PositionStatus enum"
 ```
 ---
 ## Task 2: Write `GameRulesTest` (all tests must fail)
 **Files:**
 - Create: `modules/core/src/test/scala/de/nowchess/chess/logic/GameRulesTest.scala`
 - [ ] **Step 1: Create the test file**
 ```scala
 package de.nowchess.chess.logic
 import de.nowchess.api.board.*
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class GameRulesTest extends AnyFunSuite with Matchers:
  private def sq(f: File, r: Rank): Square = Square(f, r)
  private def board(entries: (Square, Piece)*): Board = Board(entries.toMap)
  // ──── isInCheck ──────────────────────────────────────────────────────
  test("isInCheck: king attacked by enemy rook on same rank"):
    // White King E1, Black Rook A1 — rook slides along rank 1 to E1
    val b = board(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.A, Rank.R1) -> Piece.BlackRook
    )
    GameRules.isInCheck(b, Color.White) shouldBe true
  test("isInCheck: king not attacked"):
    // Black Rook A3 does not cover E1
    val b = board(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.A, Rank.R3) -> Piece.BlackRook
    )
    GameRules.isInCheck(b, Color.White) shouldBe false
  test("isInCheck: no king on board returns false"):
    val b = board(sq(File.A, Rank.R1) -> Piece.BlackRook)
    GameRules.isInCheck(b, Color.White) shouldBe false
  // ──── legalMoves ─────────────────────────────────────────────────────
  test("legalMoves: move that exposes own king to rook is excluded"):
    // White King E1, White Rook E4 (pinned on E-file), Black Rook E8
    // Moving the White Rook off the E-file would expose the king
    val b = board(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.E, Rank.R4) -> Piece.WhiteRook,
      sq(File.E, Rank.R8) -> Piece.BlackRook
    )
    val moves = GameRules.legalMoves(b, Color.White)
    moves should not contain (sq(File.E, Rank.R4) -> sq(File.D, Rank.R4))
  test("legalMoves: move that blocks check is included"):
    // White King E1 in check from Black Rook E8; White Rook A5 can interpose on E5
    val b = board(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.A, Rank.R5) -> Piece.WhiteRook,
      sq(File.E, Rank.R8) -> Piece.BlackRook
    )
    val moves = GameRules.legalMoves(b, Color.White)
    moves should contain(sq(File.A, Rank.R5) -> sq(File.E, Rank.R5))
  // ──── gameStatus ──────────────────────────────────────────────────────
  test("gameStatus: checkmate returns Mated"):
    // White Qh8, Ka6; Black Ka8
    // Qh8 attacks Ka8 along rank 8; all escape squares covered (spec-verified position)
    val b = board(
      sq(File.H, Rank.R8) -> Piece.WhiteQueen,
      sq(File.A, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
    )
    GameRules.gameStatus(b, Color.Black) shouldBe PositionStatus.Mated
  test("gameStatus: stalemate returns Drawn"):
    // White Qb6, Kc6; Black Ka8
    // Black king has no legal moves and is not in check (spec-verified position)
    val b = board(
      sq(File.B, Rank.R6) -> Piece.WhiteQueen,
      sq(File.C, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
    )
    GameRules.gameStatus(b, Color.Black) shouldBe PositionStatus.Drawn
  test("gameStatus: king in check with legal escape returns InCheck"):
    // White Ra8 attacks Black Ke8 along rank 8; king can escape to d7, e7, f7
    val b = board(
      sq(File.A, Rank.R8) -> Piece.WhiteRook,
      sq(File.E, Rank.R8) -> Piece.BlackKing
    )
    GameRules.gameStatus(b, Color.Black) shouldBe PositionStatus.InCheck
  test("gameStatus: normal starting position returns Normal"):
    GameRules.gameStatus(Board.initial, Color.White) shouldBe PositionStatus.Normal
 ```
 - [ ] **Step 2: Run the tests and confirm they all fail**
 ```bash
 ./gradlew :modules:core:test --tests "de.nowchess.chess.logic.GameRulesTest"
 ```
 Expected: all 8 tests FAIL (stubs always return `false` / `Set.empty` / `Normal`)
 - [ ] **Step 3: Commit**
 ```bash
 git add modules/core/src/test/scala/de/nowchess/chess/logic/GameRulesTest.scala
 git commit -m "test: add failing GameRulesTest for check/checkmate/stalemate"
 ```
 ---
 ## Task 3: Implement `GameRules`
 **Files:**
 - Modify: `modules/core/src/main/scala/de/nowchess/chess/logic/GameRules.scala`
 - [ ] **Step 1: Replace the stub bodies with real implementations**
 ```scala
 package de.nowchess.chess.logic
 import de.nowchess.api.board.*
 enum PositionStatus:
  case Normal, InCheck, Mated, Drawn
 object GameRules:
  def isInCheck(board: Board, color: Color): Boolean =
    board.pieces
      .collectFirst { case (sq, Piece(`color`, PieceType.King)) => sq }
      .exists { kingSq =>
        board.pieces.exists { case (sq, piece) =>
          piece.color != color &&
          MoveValidator.legalTargets(board, sq).contains(kingSq)
        }
      }
  def legalMoves(board: Board, color: Color): Set[(Square, Square)] =
    board.pieces
      .collect { case (from, piece) if piece.color == color => from }
      .flatMap { from =>
        MoveValidator.legalTargets(board, from)
          .filter { to =>
            val (newBoard, _) = board.withMove(from, to)
            !isInCheck(newBoard, color)
          }
          .map(to => from -> to)
      }
      .toSet
  def gameStatus(board: Board, color: Color): PositionStatus =
    val moves   = legalMoves(board, color)
    val inCheck = isInCheck(board, color)
    if moves.isEmpty && inCheck then PositionStatus.Mated
    else if moves.isEmpty       then PositionStatus.Drawn
    else if inCheck             then PositionStatus.InCheck
    else                             PositionStatus.Normal
 ```
 - [ ] **Step 2: Run the GameRules tests and confirm they all pass**
 ```bash
 ./gradlew :modules:core:test --tests "de.nowchess.chess.logic.GameRulesTest"
 ```
 Expected: all 8 tests PASS
 - [ ] **Step 3: Run the full test suite to make sure nothing regressed**
 ```bash
 ./gradlew :modules:core:test
 ```
 Expected: `BUILD SUCCESSFUL`, all existing tests still pass
 - [ ] **Step 4: Commit**
 ```bash
 git add modules/core/src/main/scala/de/nowchess/chess/logic/GameRules.scala
 git commit -m "feat: implement GameRules with isInCheck, legalMoves, gameStatus"
 ```
 ---
 ## Task 4: Add new `MoveResult` variants and stub `processMove`
 **Files:**
 - Modify: `modules/core/src/main/scala/de/nowchess/chess/controller/GameController.scala`
 - [ ] **Step 1: Add three new variants to `MoveResult` and import `GameRules`**
 In `GameController.scala`, update the `MoveResult` object and `processMove`. The new variants go after `Moved`. The import of `GameRules`/`PositionStatus` is added at the top. The stub `processMove` calls `GameRules.gameStatus` but always maps to `Moved` — this makes it compile while the new tests will fail:
 ```scala
 package de.nowchess.chess.controller
 import scala.io.StdIn
 import de.nowchess.api.board.{Board, Color, Piece}
 import de.nowchess.chess.logic.{MoveValidator, GameRules, PositionStatus}
 import de.nowchess.chess.view.Renderer
 // ---------------------------------------------------------------------------
 // Result ADT returned by the pure processMove function
 // ---------------------------------------------------------------------------
 sealed trait MoveResult
 object MoveResult:
  case object Quit                                                                   extends MoveResult
  case class  InvalidFormat(raw: String)                                             extends MoveResult
  case object NoPiece                                                                extends MoveResult
  case object WrongColor                                                             extends MoveResult
  case object IllegalMove                                                            extends MoveResult
  case class  Moved(newBoard: Board, captured: Option[Piece], newTurn: Color)       extends MoveResult
  case class  MovedInCheck(newBoard: Board, captured: Option[Piece], newTurn: Color) extends MoveResult
  case class  Checkmate(winner: Color)                                               extends MoveResult
  case object Stalemate                                                              extends MoveResult
 // ---------------------------------------------------------------------------
 // Controller
 // ---------------------------------------------------------------------------
 object GameController:
  def processMove(board: Board, turn: Color, raw: String): MoveResult =
    raw.trim match
      case "quit" | "q" =>
        MoveResult.Quit
      case trimmed =>
        Parser.parseMove(trimmed) match
          case None =>
            MoveResult.InvalidFormat(trimmed)
          case Some((from, to)) =>
            board.pieceAt(from) match
              case None =>
                MoveResult.NoPiece
              case Some(piece) if piece.color != turn =>
                MoveResult.WrongColor
              case Some(_) =>
                if !MoveValidator.isLegal(board, from, to) then
                  MoveResult.IllegalMove
                else
                  val (newBoard, captured) = board.withMove(from, to)
                  MoveResult.Moved(newBoard, captured, turn.opposite) // stub — Task 6 will fix
  def gameLoop(board: Board, turn: Color): Unit =
    println()
    print(Renderer.render(board))
    println(s"${turn.label}'s turn. Enter move: ")
    val input = Option(StdIn.readLine()).getOrElse("quit").trim
    processMove(board, turn, input) match
      case MoveResult.Quit =>
        println("Game over. Goodbye!")
      case MoveResult.InvalidFormat(raw) =>
        println(s"Invalid move format '$raw'. Use coordinate notation, e.g. e2e4.")
        gameLoop(board, turn)
      case MoveResult.NoPiece =>
        println(s"No piece on ${Parser.parseMove(input).map(_._1).fold("?")(_.toString)}.")
        gameLoop(board, turn)
      case MoveResult.WrongColor =>
        println(s"That is not your piece.")
        gameLoop(board, turn)
      case MoveResult.IllegalMove =>
        println(s"Illegal move.")
        gameLoop(board, turn)
      case MoveResult.Moved(newBoard, captured, newTurn) =>
        val prevTurn = newTurn.opposite
        captured.foreach: cap =>
          val toSq = Parser.parseMove(input).map(_._2).fold("?")(_.toString)
          println(s"${prevTurn.label} captures ${cap.color.label} ${cap.pieceType.label} on $toSq")
        gameLoop(newBoard, newTurn)
      case MoveResult.MovedInCheck(newBoard, captured, newTurn) => // stub — Task 6
        gameLoop(newBoard, newTurn)
      case MoveResult.Checkmate(winner) =>                         // stub — Task 6
        gameLoop(Board.initial, Color.White)
      case MoveResult.Stalemate =>                                 // stub — Task 6
        gameLoop(Board.initial, Color.White)
 ```
 - [ ] **Step 2: Confirm everything still compiles and existing tests pass**
 ```bash
 ./gradlew :modules:core:test
 ```
 Expected: `BUILD SUCCESSFUL` — existing tests still pass, no compilation errors
 - [ ] **Step 3: Commit**
 ```bash
 git add modules/core/src/main/scala/de/nowchess/chess/controller/GameController.scala
 git commit -m "feat: add MovedInCheck/Checkmate/Stalemate MoveResult variants (stub dispatch)"
 ```
 ---
 ## Task 5: Write new `GameControllerTest` cases (all must fail)
 **Files:**
 - Modify: `modules/core/src/test/scala/de/nowchess/chess/controller/GameControllerTest.scala`
 - [ ] **Step 1: Append the following tests to the existing file**
 Add after the last existing test (the `gameLoop: capture` test). Add the `captureOutput` helper alongside `withInput`:
 ```scala
  // ──── helpers ────────────────────────────────────────────────────────
  private def captureOutput(block: => Unit): String =
    val out = java.io.ByteArrayOutputStream()
    scala.Console.withOut(out)(block)
    out.toString("UTF-8")
  // ──── processMove: check / checkmate / stalemate ─────────────────────
  test("processMove: legal move that delivers check returns MovedInCheck"):
    // White Ra1, Ka3; Black Kh8 — White plays Ra1-Ra8, putting Kh8 in check
    // (Ra8 attacks along rank 8: b8..h8; king escapes to g7/g8/h7 — InCheck, not Mated)
    val b = Board(Map(
      sq(File.A, Rank.R1) -> Piece.WhiteRook,
      sq(File.A, Rank.R3) -> Piece.WhiteKing,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    ))
    GameController.processMove(b, Color.White, "a1a8") match
      case MoveResult.MovedInCheck(_, _, newTurn) => newTurn shouldBe Color.Black
      case other => fail(s"Expected MovedInCheck, got $other")
  test("processMove: legal move that results in checkmate returns Checkmate"):
    // White Qa1, Ka6; Black Ka8 — White plays Qa1-Qh8 (diagonal a1-h8)
    // After Qh8: White Qh8 + Ka6 vs Black Ka8 = checkmate (spec-verified)
    // Note: Qa1 does NOT currently attack Ka8 (path along file A is blocked by Ka6)
    val b = Board(Map(
      sq(File.A, Rank.R1) -> Piece.WhiteQueen,
      sq(File.A, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
    ))
    GameController.processMove(b, Color.White, "a1h8") match
      case MoveResult.Checkmate(winner) => winner shouldBe Color.White
      case other => fail(s"Expected Checkmate(White), got $other")
  test("processMove: legal move that results in stalemate returns Stalemate"):
    // White Qb1, Kc6; Black Ka8 — White plays Qb1-Qb6
    // After Qb6: White Qb6 + Kc6 vs Black Ka8 = stalemate (spec-verified)
    val b = Board(Map(
      sq(File.B, Rank.R1) -> Piece.WhiteQueen,
      sq(File.C, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
    ))
    GameController.processMove(b, Color.White, "b1b6") match
      case MoveResult.Stalemate => succeed
      case other => fail(s"Expected Stalemate, got $other")
  // ──── gameLoop: check / checkmate / stalemate ─────────────────────────
  test("gameLoop: checkmate prints winner message and resets to new game"):
    // Same position as checkmate processMove test above; after Qa1-Qh8 game resets
    // Second move "quit" exits the new game cleanly
    val b = Board(Map(
      sq(File.A, Rank.R1) -> Piece.WhiteQueen,
      sq(File.A, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
    ))
    val output = captureOutput:
      withInput("a1h8\nquit\n"):
        GameController.gameLoop(b, Color.White)
    output should include("Checkmate! White wins.")
  test("gameLoop: stalemate prints draw message and resets to new game"):
    val b = Board(Map(
      sq(File.B, Rank.R1) -> Piece.WhiteQueen,
      sq(File.C, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
    ))
    val output = captureOutput:
      withInput("b1b6\nquit\n"):
        GameController.gameLoop(b, Color.White)
    output should include("Stalemate! The game is a draw.")
  test("gameLoop: MovedInCheck without capture prints check message"):
    val b = Board(Map(
      sq(File.A, Rank.R1) -> Piece.WhiteRook,
      sq(File.A, Rank.R3) -> Piece.WhiteKing,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    ))
    val output = captureOutput:
      withInput("a1a8\nquit\n"):
        GameController.gameLoop(b, Color.White)
    output should include("Black is in check!")
  test("gameLoop: MovedInCheck with capture prints both capture and check message"):
    // White Rook A1 captures Black Pawn on A8, putting Black King (H8) in check
    // Ra8 attacks rank 8 → Black Kh8 is in check; king can escape to g7/g8/h7
    val b = Board(Map(
      sq(File.A, Rank.R1) -> Piece.WhiteRook,
      sq(File.A, Rank.R3) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackPawn,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    ))
    val output = captureOutput:
      withInput("a1a8\nquit\n"):
        GameController.gameLoop(b, Color.White)
    output should include("captures")
    output should include("Black is in check!")
 ```
 - [ ] **Step 2: Run only the new tests and confirm they fail**
 ```bash
 ./gradlew :modules:core:test --tests "de.nowchess.chess.controller.GameControllerTest"
 ```
 Expected: the 7 new tests FAIL; the existing 17 tests PASS
 - [ ] **Step 3: Commit**
 ```bash
 git add modules/core/src/test/scala/de/nowchess/chess/controller/GameControllerTest.scala
 git commit -m "test: add failing GameControllerTest cases for check/checkmate/stalemate"
 ```
 ---
 ## Task 6: Implement `processMove` dispatch and `gameLoop` branches
 **Files:**
 - Modify: `modules/core/src/main/scala/de/nowchess/chess/controller/GameController.scala`
 - [ ] **Step 1: Replace the stub `processMove` else-branch and the three stub `gameLoop` cases**
 Replace only the `else` branch inside `processMove` (keep everything else identical):
 ```scala
                else
                  val (newBoard, captured) = board.withMove(from, to)
                  GameRules.gameStatus(newBoard, turn.opposite) match
                    case PositionStatus.Normal  => MoveResult.Moved(newBoard, captured, turn.opposite)
                    case PositionStatus.InCheck => MoveResult.MovedInCheck(newBoard, captured, turn.opposite)
                    case PositionStatus.Mated   => MoveResult.Checkmate(turn)
                    case PositionStatus.Drawn   => MoveResult.Stalemate
 ```
 Replace the three stub `gameLoop` cases:
 ```scala
      case MoveResult.MovedInCheck(newBoard, captured, newTurn) =>
        val prevTurn = newTurn.opposite
        captured.foreach: cap =>
          val toSq = Parser.parseMove(input).map(_._2).fold("?")(_.toString)
          println(s"${prevTurn.label} captures ${cap.color.label} ${cap.pieceType.label} on $toSq")
        println(s"${newTurn.label} is in check!")
        gameLoop(newBoard, newTurn)
      case MoveResult.Checkmate(winner) =>
        println(s"Checkmate! ${winner.label} wins.")
        gameLoop(Board.initial, Color.White)
      case MoveResult.Stalemate =>
        println("Stalemate! The game is a draw.")
        gameLoop(Board.initial, Color.White)
 ```
 - [ ] **Step 2: Run all controller tests**
 ```bash
 ./gradlew :modules:core:test --tests "de.nowchess.chess.controller.GameControllerTest"
 ```
 Expected: all 24 tests PASS
 - [ ] **Step 3: Run the full test suite**
 ```bash
 ./gradlew :modules:core:test
 ```
 Expected: `BUILD SUCCESSFUL`, all tests pass
 - [ ] **Step 4: Commit**
 ```bash
 git add modules/core/src/main/scala/de/nowchess/chess/controller/GameController.scala
 git commit -m "feat: wire check/checkmate/stalemate into processMove and gameLoop"
 ```
 ---
 ## Task 7: Coverage check and final verification
 - [ ] **Step 1: Run the full build with coverage**
 ```bash
 ./gradlew :modules:core:test
 ```
 Expected: `BUILD SUCCESSFUL`
 - [ ] **Step 2: Check coverage gaps**
 ```bash
 python jacoco-reporter/scoverage_coverage_gaps.py modules/core/build/reports/scoverageTest/scoverage.xml
 ```
 Review output. If any newly added method falls below the thresholds from `CLAUDE.md` (branch ≥ 90%, line ≥ 95%, method ≥ 90%), add targeted tests to close the gaps before considering the task done.
 - [ ] **Step 3: Commit coverage fixes (if any)**
 ```bash
 git add -p
 git commit -m "test: improve coverage for GameRules and GameController"
 ```
@@ -1,85 +0,0 @@
 # Design: Add ScalaTest + Replace JaCoCo with Scoverage
 **Date:** 2026-03-22
 **Status:** Approved
 ## Summary
 Replace the current JUnit-only test setup and JaCoCo coverage with ScalaTest (via its JUnit 5 bridge) and Scoverage across both `modules/core` and `modules/api`.
 ## Motivation
 - The CLAUDE.md working agreement prescribes `AnyFunSuite with Matchers with JUnitSuiteLike` as the unit test style, which requires ScalaTest.
 - Scoverage is the standard Scala code coverage tool and understands Scala semantics; JaCoCo's JVM bytecode instrumentation is less accurate for Scala code.
 ## Scope
 Two modules are affected: `modules/core` and `modules/api`. The root `build.gradle.kts` is updated for shared dependency versions only.
 ## Changes
 ### Root `build.gradle.kts`
 Add to the `versions` map (dependency versions only — plugin version is hardcoded per module, see note below):
 - `SCALATEST` → `3.2.19`
 - `SCALATESTPLUS_JUNIT5` → `3.2.19.1`
 > **Note on plugin versioning:** Gradle resolves the `plugins {}` block before `rootProject.extra` is available, so the Scoverage plugin version (`8.1`) must be declared inline in each module's `plugins {}` block. It cannot be read from the root versions map.
 ### `modules/core/build.gradle.kts` and `modules/api/build.gradle.kts`
 Both modules require the same set of changes. Both currently have **two separate `tasks.test {}` blocks** that must be merged into one.
 **Plugins block:**
 - Remove `jacoco`
 - Add `id("org.scoverage") version "8.1"`
 **Dependencies block:**
 - Remove `testImplementation(platform("org.junit:junit-bom:5.10.0"))`
 - Remove `testImplementation("org.junit.jupiter:junit-jupiter")`
 - Remove `testRuntimeOnly("org.junit.platform:junit-platform-launcher")`
 - Add `testImplementation("org.scalatest:scalatest_3:${versions["SCALATEST"]!!}")`
 - Add `testImplementation("org.scalatestplus:junit-5-11_3:${versions["SCALATESTPLUS_JUNIT5"]!!}")`
 **Task wiring — merge both `tasks.test {}` blocks into one and replace jacoco wiring:**
 Both `modules/core` and `modules/api` currently have two `tasks.test {}` blocks. Delete both and replace with the following single merged block placed **after** the `dependencies {}` block (conventional position):
 ```kotlin
 tasks.test {
    useJUnitPlatform()   // required — scalatestplus JUnit 5 bridge relies on this
    finalizedBy(tasks.reportScoverage)
 }
 tasks.reportScoverage {
    dependsOn(tasks.test)
 }
 ```
 > Note: `modules/api` does not currently have `useJUnitPlatform()` — it must be **added** (not just kept) in the merged block.
 Remove the `jacocoTestReport` task block entirely from both modules.
 **Task name confirmation:** The Scoverage Gradle plugin 8.1 registers `reportScoverage` as the HTML report task.
 ## Versions
 | Artifact | Version | Notes |
 |---|---|---|
 | `org.scalatest:scalatest_3` | 3.2.19 | Core ScalaTest for Scala 3 |
 | `org.scalatestplus:junit-5-11_3` | 3.2.19.1 | JUnit 5.11 runner bridge; `.1` = build 1 |
 | Scoverage Gradle plugin | 8.1 | Hardcoded inline in `plugins {}` block |
 ## Testing the Change
 After applying:
 1. `./gradlew :modules:core:test` and `./gradlew :modules:api:test` must pass (green, even with zero test files).
 2. `./gradlew :modules:core:reportScoverage` must produce a coverage report.
 3. `./gradlew build` must be fully green.
 ## Files Modified
 - `build.gradle.kts` (root) — add two version entries
 - `modules/core/build.gradle.kts` — plugin, deps, merge two `tasks.test` blocks, replace jacoco wiring
 - `modules/api/build.gradle.kts` — plugin, deps, merge two `tasks.test` blocks, add `useJUnitPlatform()`, replace jacoco wiring
 No new source files are created.
@@ -1,169 +0,0 @@
 # Chess Check / Checkmate / Stalemate — Design Spec
 **Date:** 2026-03-23
 **Status:** Approved
 ---
 ## Scope
 Implement check detection, checkmate (win condition), and stalemate (draw) on top of the existing normal-move rules. En passant, castling, and pawn promotion are **out of scope** for this iteration.
 ---
 ## Architecture
 ### New: `GameRules` object
 **File:** `modules/core/src/main/scala/de/nowchess/chess/logic/GameRules.scala`
 Owns all check-aware game logic. `MoveValidator` retains its documented geometric-only contract ("ignoring check/pin").
 ```
 GameRules
  isInCheck(board, color): Boolean
  legalMoves(board, color): Set[(Square, Square)]
  gameStatus(board, color): PositionStatus
 ```
 #### `isInCheck(board, color)`
 Finds the king square for `color` by scanning `board.pieces` for a `Piece(color, PieceType.King)`. If no king is found (constructed/test boards), returns `false`.
 Then checks whether any enemy piece's `MoveValidator.legalTargets` contains that square. This works correctly for all piece types, including the king: `kingTargets` returns the squares the king can move to, which are identical to the squares the king attacks, so using `legalTargets` for attack detection is correct by design.
 Returns `true` if the king square is covered by at least one enemy piece.
 #### `legalMoves(board, color)`
 1. Filter `board.pieces` to entries where `piece.color == color`.
 2. For each such `(from, piece)`, call `MoveValidator.legalTargets(board, from)` to get geometric candidates.
 3. For each candidate `to`, apply `board.withMove(from, to)` to get `newBoard`.
 4. Keep only moves where `isInCheck(newBoard, color)` is `false` (i.e., the move does not leave own king in check).
 5. Return the full set of `(from, to)` pairs that survive this filter.
 #### `gameStatus(board, color)`
 Returns a `PositionStatus` enum value based on `legalMoves(board, color)` and `isInCheck(board, color)`:
 - `Mated`    — `legalMoves` is empty **and** king is in check → the side to move has been checkmated
 - `Drawn`    — `legalMoves` is empty **and** king is **not** in check → stalemate (draw)
 - `InCheck`  — `legalMoves` is non-empty **and** king is in check → game continues under check
 - `Normal`   — otherwise
 #### Local `PositionStatus` enum
 Defined in `GameRules.scala`. Names are intentionally distinct from `MoveResult` variants to avoid unqualified-name collisions in `GameController.scala`:
 ```scala
 enum PositionStatus:
  case Normal, InCheck, Mated, Drawn
 ```
 ---
 ### Modified: `MoveResult` (in `GameController.scala`)
 Three new variants; existing variants are unchanged:
 | Variant | When used |
 |---|---|
 | `MovedInCheck(newBoard, captured, newTurn)` | Move was legal; opponent is now in check but has legal replies |
 | `Checkmate(winner: Color)` | Move was legal; opponent is `Mated` → `winner` is the side that just moved |
 | `Stalemate` | Move was legal; opponent is `Drawn` (no legal reply, not in check) |
 `Moved` continues to be used when `gameStatus` returns `Normal`.
 ---
 ### Modified: `GameController.processMove`
 After computing `(newBoard, captured)` from `board.withMove`:
 1. Call `GameRules.gameStatus(newBoard, newTurn)`.
 2. Map to the appropriate `MoveResult`:
 ```
 PositionStatus.Normal   → Moved(newBoard, captured, newTurn)
 PositionStatus.InCheck  → MovedInCheck(newBoard, captured, newTurn)
 PositionStatus.Mated    → Checkmate(turn)   // turn = the side that just moved
 PositionStatus.Drawn    → Stalemate
 ```
 ---
 ### Modified: `GameController.gameLoop`
 **New terminal branches** (both print a message then restart):
 - `Checkmate(winner)` → print `"Checkmate! {winner.label} wins."`, then recurse with `(Board.initial, Color.White)`
 - `Stalemate`         → print `"Stalemate! The game is a draw."`, then recurse with `(Board.initial, Color.White)`
 **New non-terminal branch:**
 - `MovedInCheck(newBoard, captured, newTurn)` → print the same optional capture message as `Moved` (when `captured.isDefined`), then print `"{newTurn.label} is in check!"`, then recurse with `(newBoard, newTurn)`
 **Restart vs. exit:** Checkmate and stalemate restart the game automatically (no prompt). This is intentionally asymmetric with `Quit`, which exits. `Quit` is an explicit user request to stop; Checkmate/Stalemate are natural game endings that should roll into a new game.
 ---
 ## Test Strategy
 All tests are unit tests extending `AnyFunSuite with Matchers with JUnitSuiteLike`.
 ### `GameRulesTest` — new file
 | Scenario | Method | Expected |
 |---|---|---|
 | King attacked by enemy rook on same rank | `isInCheck` | `true` |
 | King not attacked (only own pieces nearby) | `isInCheck` | `false` |
 | No king on board (constructed board) | `isInCheck` | `false` |
 | Move that exposes own king to rook is excluded | `legalMoves` | does not contain that move |
 | Move that blocks check is included | `legalMoves` | contains the blocking move |
 | Checkmate: White Qh8, Ka6; Black Ka8 — Black king is in check (Qh8 along rank 8), cannot escape to a7 (Ka6), b7 (Ka6), or b8 (Qh8) | `gameStatus` | `Mated` |
 | Stalemate: White Qb6, Kc6; Black Ka8 — Black king has no legal moves (a7/b7/b8 all controlled by Qb6), not in check | `gameStatus` | `Drawn` |
 | King in check with at least one escape square | `gameStatus` | `InCheck` |
 | Normal midgame position, not in check, has moves | `gameStatus` | `Normal` |
 ### `GameControllerTest` additions — new `processMove` cases
 | Scenario | Expected `MoveResult` |
 |---|---|
 | Move leaves opponent in check (has escape) | `MovedInCheck` |
 | Move results in checkmate | `Checkmate(winner)` where winner is the side that moved |
 | Move results in stalemate | `Stalemate` |
 ### `GameControllerTest` additions — new `gameLoop` cases
 | Scenario | Expected output / behavior |
 |---|---|
 | `gameLoop` receives `Checkmate(White)` | Prints "Checkmate! White wins." and continues (new game) |
 | `gameLoop` receives `Stalemate` | Prints "Stalemate! The game is a draw." and continues (new game) |
 | `gameLoop` receives `MovedInCheck` with a capture | Prints capture message AND check message |
 | `gameLoop` receives `MovedInCheck` without a capture | Prints check message only |
 ---
 ## Development Workflow (TDD)
 1. Create `GameRules.scala` with empty/stub method bodies that compile but return placeholder values (`false`, `Set.empty`, `PositionStatus.Normal`).
 2. Write all `GameRulesTest` tests — they should **fail**.
 3. Implement `GameRules` logic until `GameRulesTest` is green.
 4. Add new `MoveResult` variants to `GameController.scala`; update `processMove` to call `GameRules.gameStatus` (stub the match arms initially).
 5. Write new `GameControllerTest` cases — they should **fail**.
 6. Implement `processMove` match arms and `gameLoop` new branches until all tests pass.
 7. Run `./gradlew :modules:core:test` — full green build required.
 ---
 ## Files Changed
 | File | Change |
 |---|---|
 | `modules/core/src/main/scala/de/nowchess/chess/logic/GameRules.scala` | New |
 | `modules/core/src/test/scala/de/nowchess/chess/logic/GameRulesTest.scala` | New |
 | `modules/core/src/main/scala/de/nowchess/chess/controller/GameController.scala` | Add `MoveResult` variants; update `processMove` and `gameLoop` |
 | `modules/core/src/test/scala/de/nowchess/chess/controller/GameControllerTest.scala` | Add new test cases |
 No changes to `modules/api` or `MoveValidator`.
@@ -1,255 +0,0 @@
 # Castling Implementation Design
 **Date:** 2026-03-24
 **Status:** Approved (rev 2)
 **Branch:** castling
 ---
 ## Context
 The NowChessSystems chess engine currently operates on a raw `Board` (opaque `Map[Square, Piece]`) paired with a `Color` for turn tracking. Castling requires tracking whether the king and rooks have previously moved — state that does not exist in the current engine layer. The `CastlingRights` and `MoveType.Castle*` types are already defined in the `api` module but are not wired into the engine.
 ---
 ## Approach: `GameContext` Wrapper (Option B)
 Introduce a thin `GameContext` wrapper in `modules/core` that bundles `Board` with castling rights for both sides. This is the single seam through which the engine learns about castling availability without pulling in the full FEN-structured `GameState` type.
 ---
 ## Section 1 — `GameContext` Type
 **Location:** `modules/core/src/main/scala/de/nowchess/chess/logic/GameContext.scala`
 ```scala
 case class GameContext(
  board: Board,
  whiteCastling: CastlingRights,
  blackCastling: CastlingRights
 ):
  def castlingFor(color: Color): CastlingRights =
    if color == Color.White then whiteCastling else blackCastling
  def withUpdatedRights(color: Color, rights: CastlingRights): GameContext =
    if color == Color.White then copy(whiteCastling = rights)
    else copy(blackCastling = rights)
 ```
 `GameContext.initial` wraps `Board.initial` with `CastlingRights.Both` for both sides.
 `gameLoop` and `processMove` replace `(board: Board, turn: Color)` with `(ctx: GameContext, turn: Color)`. All `MoveResult` variants that previously carried `newBoard: Board` now carry `newCtx: GameContext`. The `gameLoop` render call becomes `Renderer.render(ctx.board)`, and all `gameLoop` pattern match arms that destructure `MoveResult.Moved(newBoard, ...)` or `MoveResult.MovedInCheck(newBoard, ...)` must be updated to destructure `newCtx` and pass it to the recursive `gameLoop` call.
 ---
 ## Section 2 — `CastleSide` and Board Extension for Castle Moves
 ### `CastleSide` enum
 `CastleSide` is a two-value engine-internal enum defined in `core` (not in `api`). It is co-located in `GameContext.scala` — there is no separate `CastleSide.scala` file.
 ```scala
 enum CastleSide:
  case Kingside, Queenside
 ```
 ### `withCastle` extension
 `Board.withMove(from, to)` moves a single piece. Castling moves two pieces atomically. To avoid a circular dependency (`api` must not import from `core`), `withCastle` is **not** added to `Board` in the `api` module. Instead it is defined as an extension method in `core`, co-located with `GameContext`:
 ```scala
 // inside GameContext.scala or a BoardCastleOps.scala in core
 extension (b: Board)
  def withCastle(color: Color, side: CastleSide): Board = ...
 ```
 Post-castle square assignments:
 - **Kingside White:** King e1→g1, Rook h1→f1
 - **Queenside White:** King e1→c1, Rook a1→d1
 - **Kingside Black:** King e8→g8, Rook h8→f8
 - **Queenside Black:** King e8→c8, Rook a8→d8
 ---
 ## Section 3 — `MoveValidator` Castling Logic
 ### Signature change
 `legalTargets` and `isLegal` are extended to accept `GameContext` when the caller has full game context. To avoid breaking `GameRules.isInCheck` (which uses `legalTargets` with only a `Board` for attacked-square detection), the implementation retains a **board-only private helper** for sliding/jump/normal king targets, and a **public overload** that additionally unions castling targets when a `GameContext` is provided:
 ```scala
 // board-only (used internally by isInCheck)
 def legalTargets(board: Board, from: Square): Set[Square]
 // context-aware (used by legalMoves and processMove)
 def legalTargets(ctx: GameContext, from: Square): Set[Square]
 ```
 The `GameContext` overload delegates to the `Board` overload for all piece types except King, where it additionally unions `castlingTargets(ctx, color)`.
 `isLegal` is likewise overloaded:
 ```scala
 // board-only (retained for callers that have no castling context)
 def isLegal(board: Board, from: Square, to: Square): Boolean
 // context-aware (used by processMove)
 def isLegal(ctx: GameContext, from: Square, to: Square): Boolean
 ```
 The context-aware `isLegal(ctx, from, to)` calls `legalTargets(ctx, from).contains(to)` — using the context-aware overload — so castling targets are included in the legality check.
 ### `castlingTargets` method
 ```scala
 def castlingTargets(ctx: GameContext, color: Color): Set[Square]
 ```
 For each side (kingside, queenside), checks all six conditions in order (failing fast):
 1. `CastlingRights` flag is `true` for that side (`ctx.castlingFor(color)`)
 2. King is on its home square (e1 for White, e8 for Black)
 3. Relevant rook is on its home square (h-file for kingside, a-file for queenside)
 4. All squares between king and rook are empty
 5. King is **not currently in check** — calls `GameRules.isInCheck(ctx.board, color)` using the board-only path (no castling recursion)
 6. Each square the king **passes through and lands on** is not attacked — checks that no enemy `legalTargets(board, enemySq)` (board-only) covers those squares
 Transit and landing squares:
 - **Kingside:** f-file, g-file (White: f1, g1; Black: f8, g8)
 - **Queenside:** d-file, c-file (White: d1, c1; Black: d8, c8). Note: b1/b8 must be empty (condition 4) but the king does not pass through them, so they are not checked for attacks.
 ---
 ## Section 4 — `GameRules` Changes
 `GameRules.legalMoves` must accept `GameContext` (not just `Board`) so it can enumerate castling moves as part of the legal move set. This is required for correct stalemate and checkmate detection — a position where the only legal move is to castle must not be evaluated as stalemate.
 ```scala
 def legalMoves(ctx: GameContext, color: Color): Set[(Square, Square)]
 ```
 Internally it calls `MoveValidator.legalTargets(ctx, from)` (the context-aware overload) for all pieces of `color`, then filters to moves that do not leave the king in check.
 `isInCheck` retains its `(board: Board, color: Color)` signature — it does not need castling context.
 `gameStatus` is updated to accept `GameContext`:
 ```scala
 def gameStatus(ctx: GameContext, color: Color): PositionStatus
 ```
 ---
 ## Section 5 — `GameController` Changes
 ### Move detection and execution
 `processMove` identifies a castling move by the king occupying its home square and moving exactly two files laterally:
 - White: e1→g1 (kingside) or e1→c1 (queenside)
 - Black: e8→g8 (kingside) or e8→c8 (queenside)
 Legality is confirmed via `MoveValidator.isLegal(ctx, from, to)` (the context-aware overload, which includes castling targets). When a castling move is legal and executed:
 1. Call `ctx.board.withCastle(color, side)` to move both pieces atomically.
 2. Revoke **both** castling rights for the moving color in the new `GameContext`.
 ### Rights revocation rules (applied on every move)
 After every move `(from, to)` is applied, revoke rights based on both the **source square** and the **destination square**. Both tables are checked independently and all triggered revocations are applied.
 **Source square → revocation** (piece leaves its home square):
 | Source square | Rights revoked |
 |---------------|---------------|
 | `e1` | Both White castling rights |
 | `e8` | Both Black castling rights |
 | `a1` | White queenside |
 | `h1` | White kingside |
 | `a8` | Black queenside |
 | `h8` | Black kingside |
 **Destination square → revocation** (a piece — including an enemy piece — arrives on a rook home square, meaning a capture removed the rook):
 | Destination square | Rights revoked |
 |--------------------|---------------|
 | `a1` | White queenside |
 | `h1` | White kingside |
 | `a8` | Black queenside |
 | `h8` | Black kingside |
 This covers the following cases:
 - **King normal move** — source square e1/e8 fires; both rights revoked.
 - **King castle move** — the castle-specific step 2 revokes both rights for the moving color. Additionally, the source-square table fires (king departs e1/e8), revoking the same rights a second time. This double-revocation is idempotent and harmless. The king's destination (g1/c1/g8/c8) does not appear in the destination table, so no extra revocation fires there.
 - **Own rook move** — source square a1/h1/a8/h8 fires.
 - **Enemy capture on a rook home square** — destination square a1/h1/a8/h8 fires, revoking the side that lost the rook.
 `processMove` also calls `GameRules.gameStatus(newCtx, turn.opposite)` — note this call passes the full `GameContext`, not just a `Board`, because `gameStatus` now accepts `GameContext`.
 The revocation is applied to the `GameContext` that results from the move, before it is returned in `MoveResult`.
 ### Signatures
 ```scala
 def processMove(ctx: GameContext, turn: Color, raw: String): MoveResult
 def gameLoop(ctx: GameContext, turn: Color): Unit
 ```
 `MoveResult.Moved` and `MoveResult.MovedInCheck` carry `newCtx: GameContext` instead of `newBoard: Board`. All `gameLoop` pattern match arms are updated to use `newCtx`. The render call uses `newCtx.board`.
 On checkmate/stalemate reset, `GameContext.initial` is used.
 ---
 ## Section 6 — Move Notation
 The player types standard coordinate notation:
 - `e1g1` → White kingside castle
 - `e1c1` → White queenside castle
 - `e8g8` → Black kingside castle
 - `e8c8` → Black queenside castle
 No parser changes required. The controller identifies castling by the king moving 2 files from the home square.
 ---
 ## Section 7 — Testing
 ### `MoveValidatorTest`
 - Castling target (g1) is returned when all kingside conditions are met (White)
 - Castling target (c1) is returned when all queenside conditions are met (White)
 - Castling targets returned for Black kingside (g8) and queenside (c8)
 - Castling blocked when transit square is occupied (piece between king and rook)
 - Castling blocked when king is in check (condition 5)
 - Castling blocked when **transit square** is attacked (e.g., f1 attacked for White kingside)
 - Castling blocked when **landing square** is attacked (e.g., g1 attacked for White kingside)
 - Castling blocked when `kingSide = false` in `CastlingRights`
 - Castling blocked when `queenSide = false` in `CastlingRights`
 - Castling blocked when relevant rook is not on its home square
 ### `GameControllerTest`
 - `processMove` with `e1g1` returns `Moved` with king on g1, rook on f1, and both White castling rights revoked in `newCtx`
 - `processMove` with `e1c1` returns `Moved` with king on c1, rook on d1, and both White castling rights revoked in `newCtx`
 - `processMove` castle attempt after king has moved returns `IllegalMove`
 - `processMove` castle attempt after rook has moved returns `IllegalMove`
 - Normal rook move from h1 revokes White kingside right in the returned `newCtx`
 - Normal king move from e1 revokes both White rights in the returned `newCtx`
 - Enemy capture on h1 (e.g., Black rook captures White rook on h1) revokes White kingside right in the returned `newCtx`
 ### `GameRulesTest`
 - `legalMoves` includes castling destinations when available
 - `legalMoves` excludes castling when king is in check
 - `gameStatus` returns `Normal` (not `Drawn`) when the only legal move available is to castle — verifying that the `GameContext` signature change correctly prevents a false stalemate
 ---
 ## Files to Create / Modify
 | Action | File |
 |--------|------|
 | **Create** | `modules/core/src/main/scala/de/nowchess/chess/logic/GameContext.scala` — includes `CastleSide` enum and `withCastle` Board extension |
 | **Modify** | `modules/core/src/main/scala/de/nowchess/chess/logic/MoveValidator.scala` — add `castlingTargets`, board-only + context-aware `legalTargets`/`isLegal` overloads |
 | **Modify** | `modules/core/src/main/scala/de/nowchess/chess/logic/GameRules.scala` — update `legalMoves` and `gameStatus` to accept `GameContext` |
 | **Modify** | `modules/core/src/main/scala/de/nowchess/chess/controller/GameController.scala` — use `GameContext`; castling detection, execution, rights revocation |
 | **Modify** | `modules/core/src/main/scala/de/nowchess/chess/Main.scala` — use `GameContext.initial` |
 | **Modify** | `modules/core/src/test/scala/de/nowchess/chess/logic/MoveValidatorTest.scala` — new castling tests |
 | **Modify** | `modules/core/src/test/scala/de/nowchess/chess/controller/GameControllerTest.scala` — update signatures + new castling tests |
 | **Modify** | `modules/core/src/test/scala/de/nowchess/chess/logic/GameRulesTest.scala` — update signatures + new castling tests |
@@ -1,23 +0,0 @@
 # Unresolved Issues
 ## [2026-03-24] JUnitSuiteLike mixin not available for ScalaTest 3.2.19 with Scala 3
 **Requirement / Bug:**
 CLAUDE.md prescribes that all unit tests should extend `AnyFunSuite with Matchers with JUnitSuiteLike`. However, the `JUnitSuiteLike` trait cannot be resolved in the current build configuration.
 **Root Cause (if known):**
 - ScalaTest 3.2.19 for Scala 3 does not provide `JUnitSuiteLike` in any public package.
 - The `co.helmethair:scalatest-junit-runner:0.1.11` dependency does not expose this trait.
 - There is no `org.scalatest:scalatest-junit_3` artifact available for version 3.2.19.
 - The trait may have been removed or changed in the ScalaTest 3.x → Scala 3 migration.
 **Attempted Fixes:**
 1. Tried importing from `org.scalatest.junit.JUnitSuiteLike` — not found
 2. Tried importing from `org.scalatestplus.junit.JUnitSuiteLike` — not found
 3. Tried importing from `co.helmethair.scalatest.junit.JUnitSuiteLike` — not found
 4. Attempted to add `org.scalatest:scalatest-junit_3:3.2.19` dependency — artifact does not exist in Maven Central
 **Suggested Next Step:**
 1. Either find the correct ScalaTest artifact/import for Scala 3 JUnit integration, or
 2. Update CLAUDE.md to reflect the actual constraint that unit tests should extend `AnyFunSuite with Matchers` (without `JUnitSuiteLike`), or
 3. Investigate whether a different test runner or configuration is needed to achieve JUnit integration with ScalaTest 3 in Scala 3
@@ -1,594 +0,0 @@
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 </verification-metadata>
@@ -1,411 +0,0 @@
 #!/usr/bin/env python3
 """
 JaCoCo Coverage Gap Reporter
 Parses a JaCoCo XML report and outputs missing line & branch (conditional)
 coverage in a structured format that Claude Code agents can act on directly.
 Usage:
    python jacoco_coverage_gaps.py <jacoco-report.xml> [--min-coverage 80]
    python jacoco_coverage_gaps.py <jacoco-report.xml> --output json
    python jacoco_coverage_gaps.py <jacoco-report.xml> --output markdown
    python jacoco_coverage_gaps.py <jacoco-report.xml> --output agent   (default)
 """
 import xml.etree.ElementTree as ET
 import sys
 import argparse
 import json
 from pathlib import Path
 from dataclasses import dataclass, field
 from typing import Optional
 # ---------------------------------------------------------------------------
 # Data classes
 # ---------------------------------------------------------------------------
@dataclass
 class LineCoverage:
    line_number: int
    hits: int                   # 0 = not executed
    branch_total: int = 0       # 0 = not a branch point
    branch_covered: int = 0
    @property
    def is_uncovered(self) -> bool:
        return self.hits == 0
    @property
    def is_partial_branch(self) -> bool:
        return self.branch_total > 0 and self.branch_covered < self.branch_total
@dataclass
 class MethodCoverage:
    name: str
    descriptor: str
    first_line: Optional[int]
    missed_instructions: int
    covered_instructions: int
    missed_branches: int
    covered_branches: int
    uncovered_lines: list[int] = field(default_factory=list)
    partial_branch_lines: list[int] = field(default_factory=list)
    @property
    def total_branches(self) -> int:
        return self.missed_branches + self.covered_branches
    @property
    def is_fully_covered(self) -> bool:
        return self.missed_instructions == 0 and self.missed_branches == 0
    @property
    def branch_coverage_pct(self) -> float:
        total = self.total_branches
        return 100.0 * self.covered_branches / total if total else 100.0
    @property
    def line_coverage_pct(self) -> float:
        total = self.missed_instructions + self.covered_instructions
        return 100.0 * self.covered_instructions / total if total else 100.0
@dataclass
 class ClassCoverage:
    class_name: str             # e.g. com/example/Foo
    source_file: Optional[str]
    methods: list[MethodCoverage] = field(default_factory=list)
    all_lines: list[LineCoverage] = field(default_factory=list)
    @property
    def java_class_name(self) -> str:
        return self.class_name.replace("/", ".")
    @property
    def source_path(self) -> Optional[str]:
        """Best-guess relative source path."""
        if self.source_file:
            package = "/".join(self.class_name.split("/")[:-1])
            return f"src/main/java/{package}/{self.source_file}" if package else f"src/main/java/{self.source_file}"
        return None
    @property
    def uncovered_lines(self) -> list[int]:
        return sorted({l.line_number for l in self.all_lines if l.is_uncovered})
    @property
    def partial_branch_lines(self) -> list[int]:
        return sorted({l.line_number for l in self.all_lines if l.is_partial_branch})
    @property
    def missed_branches(self) -> int:
        return sum(max(l.branch_total - l.branch_covered, 0) for l in self.all_lines)
    @property
    def total_branches(self) -> int:
        return sum(l.branch_total for l in self.all_lines)
    @property
    def covered_branches(self) -> int:
        return self.total_branches - self.missed_branches
    @property
    def missed_lines(self) -> int:
        return len(self.uncovered_lines)
    @property
    def total_lines(self) -> int:
        return len(self.all_lines)
    @property
    def covered_lines(self) -> int:
        return self.total_lines - self.missed_lines
    @property
    def has_gaps(self) -> bool:
        return bool(self.uncovered_lines or self.partial_branch_lines)
 # ---------------------------------------------------------------------------
 # Parser
 # ---------------------------------------------------------------------------
 def parse_jacoco_xml(xml_path: str) -> list[ClassCoverage]:
    """Parse a JaCoCo XML report into ClassCoverage objects."""
    tree = ET.parse(xml_path)
    root = tree.getroot()
    results: list[ClassCoverage] = []
    for package in root.iter("package"):
        for cls_elem in package.findall("class"):
            class_name = cls_elem.get("name", "")
            source_file = cls_elem.get("sourcefilename")
            # Build method map from <method> children
            methods: list[MethodCoverage] = []
            for m in cls_elem.findall("method"):
                counters = {c.get("type"): c for c in m.findall("counter")}
                def _missed(t): return int(counters[t].get("missed", 0)) if t in counters else 0
                def _covered(t): return int(counters[t].get("covered", 0)) if t in counters else 0
                methods.append(MethodCoverage(
                    name=m.get("name", ""),
                    descriptor=m.get("desc", ""),
                    first_line=int(m.get("line")) if m.get("line") else None,
                    missed_instructions=_missed("INSTRUCTION"),
                    covered_instructions=_covered("INSTRUCTION"),
                    missed_branches=_missed("BRANCH"),
                    covered_branches=_covered("BRANCH"),
                ))
            cc = ClassCoverage(
                class_name=class_name,
                source_file=source_file,
                methods=methods,
            )
            # Per-line data lives in the matching <sourcefile> element
            source_file_elem = package.find(f"sourcefile[@name='{source_file}']") if source_file else None
            if source_file_elem is not None:
                for line_elem in source_file_elem.findall("line"):
                    nr = int(line_elem.get("nr", 0))
                    mi = int(line_elem.get("mi", 0))   # missed instructions
                    ci = int(line_elem.get("ci", 0))   # covered instructions
                    mb = int(line_elem.get("mb", 0))   # missed branches
                    cb = int(line_elem.get("cb", 0))   # covered branches
                    hits = ci  # ci > 0 means line was executed at least once
                    cc.all_lines.append(LineCoverage(
                        line_number=nr,
                        hits=hits,
                        branch_total=mb + cb,
                        branch_covered=cb,
                    ))
            if cc.has_gaps:
                results.append(cc)
    return results
 # ---------------------------------------------------------------------------
 # Formatters
 # ---------------------------------------------------------------------------
 def _compact_ranges(numbers: list[int]) -> str:
    """Turn [1,2,3,5,7,8,9] -> '1-3, 5, 7-9'"""
    if not numbers:
        return ""
    ranges = []
    start = prev = numbers[0]
    for n in numbers[1:]:
        if n == prev + 1:
            prev = n
        else:
            ranges.append(f"{start}-{prev}" if start != prev else str(start))
            start = prev = n
    ranges.append(f"{start}-{prev}" if start != prev else str(start))
    return ", ".join(ranges)
 def format_agent(classes: list[ClassCoverage]) -> str:
    """
    Output optimised for Claude Code agents:
    – structured, machine-readable yet human-legible
    – uses file paths and line numbers agents can act on
    – groups by file, sorts by severity (most gaps first)
    """
    lines: list[str] = []
    lines.append("# JaCoCo Coverage Gaps — Agent Action Report")
    lines.append("")
    lines.append("## Summary")
    total_uncovered = sum(c.missed_lines for c in classes)
    total_partial = sum(len(c.partial_branch_lines) for c in classes)
    total_missed_branches = sum(c.missed_branches for c in classes)
    lines.append(f"- Files with gaps : {len(classes)}")
    lines.append(f"- Uncovered lines : {total_uncovered}")
    lines.append(f"- Partial branches: {total_partial} lines affected")
    lines.append(f"- Missed branches : {total_missed_branches} branch paths")
    lines.append("")
    lines.append("---")
    lines.append("")
    lines.append("## Files Requiring Tests")
    lines.append("")
    lines.append("> Each entry lists the SOURCE FILE PATH, the LINE NUMBERS that need")
    lines.append("> coverage, and the METHODS that contain those gaps.")
    lines.append("> Write or extend unit/integration tests to exercise these paths.")
    lines.append("")
    # Sort: most uncovered lines first
    sorted_classes = sorted(classes, key=lambda c: -(c.missed_lines + len(c.partial_branch_lines)))
    for cls in sorted_classes:
        source = cls.source_path or f"(source unknown) {cls.java_class_name}"
        lines.append(f"### `{source}`")
        lines.append(f"**Class**: `{cls.java_class_name}`")
        lines.append("")
        if cls.uncovered_lines:
            lines.append(f"#### ❌ Uncovered Lines")
            lines.append(f"Lines not executed at all: `{_compact_ranges(cls.uncovered_lines)}`")
            lines.append("")
            lines.append("**Methods with uncovered lines:**")
            for method in cls.methods:
                uncov = [l for l in cls.uncovered_lines
                         if method.first_line and l >= method.first_line]
                # heuristic: only attribute if there are uncovered lines near the method start
                if method.missed_instructions > 0:
                    sig = f"`{method.name}{method.descriptor}`"
                    pct = method.line_coverage_pct
                    lines.append(f"  - {sig} — {pct:.0f}% instruction coverage")
            lines.append("")
        if cls.partial_branch_lines:
            lines.append(f"#### ⚠️  Partial Branch Coverage (Missing Conditional Paths)")
            lines.append(f"Lines where not all branches are taken: `{_compact_ranges(cls.partial_branch_lines)}`")
            lines.append("")
            lines.append("**Methods with branch gaps:**")
            for method in cls.methods:
                if method.missed_branches > 0:
                    sig = f"`{method.name}{method.descriptor}`"
                    pct = method.branch_coverage_pct
                    missing = method.missed_branches
                    lines.append(f"  - {sig} — {pct:.0f}% branch coverage ({missing} branch path(s) never taken)")
            lines.append("")
        lines.append("**Action**: Add tests that exercise the above lines/branches.")
        lines.append("")
        lines.append("---")
        lines.append("")
    lines.append("## Quick Reference: All Uncovered Locations")
    lines.append("")
    lines.append("Copy-paste friendly list for IDE navigation or grep:")
    lines.append("")
    lines.append("```")
    for cls in sorted_classes:
        src = cls.source_path or cls.java_class_name
        if cls.uncovered_lines:
            for ln in cls.uncovered_lines:
                lines.append(f"{src}:{ln}  # uncovered line")
        if cls.partial_branch_lines:
            for ln in cls.partial_branch_lines:
                lines.append(f"{src}:{ln}  # partial branch")
    lines.append("```")
    return "\n".join(lines)
 def format_json(classes: list[ClassCoverage]) -> str:
    out = []
    for cls in classes:
        out.append({
            "class": cls.java_class_name,
            "source_path": cls.source_path,
            "uncovered_lines": cls.uncovered_lines,
            "partial_branch_lines": cls.partial_branch_lines,
            "missed_branches": cls.missed_branches,
            "methods": [
                {
                    "name": m.name,
                    "descriptor": m.descriptor,
                    "first_line": m.first_line,
                    "line_coverage_pct": round(m.line_coverage_pct, 1),
                    "branch_coverage_pct": round(m.branch_coverage_pct, 1),
                    "missed_branches": m.missed_branches,
                    "missed_instructions": m.missed_instructions,
                }
                for m in cls.methods
                if not m.is_fully_covered
            ],
        })
    return json.dumps(out, indent=2)
 def format_markdown(classes: list[ClassCoverage]) -> str:
    lines: list[str] = []
    lines.append("# JaCoCo Missing Coverage Report\n")
    for cls in sorted(classes, key=lambda c: cls.java_class_name):
        lines.append(f"## {cls.java_class_name}")
        if cls.source_path:
            lines.append(f"**File**: `{cls.source_path}`\n")
        if cls.uncovered_lines:
            lines.append(f"**Uncovered lines**: {_compact_ranges(cls.uncovered_lines)}\n")
        if cls.partial_branch_lines:
            lines.append(f"**Partial branches at lines**: {_compact_ranges(cls.partial_branch_lines)}\n")
        lines.append("| Method | Line Coverage | Branch Coverage | Missed Branches |")
        lines.append("|--------|--------------|-----------------|-----------------|")
        for m in cls.methods:
            if not m.is_fully_covered:
                lines.append(
                    f"| `{m.name}` | {m.line_coverage_pct:.0f}% | "
                    f"{m.branch_coverage_pct:.0f}% | {m.missed_branches} |"
                )
        lines.append("")
    return "\n".join(lines)
 # ---------------------------------------------------------------------------
 # Entry point
 # ---------------------------------------------------------------------------
 def main() -> None:
    parser = argparse.ArgumentParser(
        description="Report missing line & branch coverage from a JaCoCo XML report."
    )
    parser.add_argument("xml_file", help="Path to jacoco.xml report file")
    parser.add_argument(
        "--output", "-o",
        choices=["agent", "json", "markdown"],
        default="json",
        help="Output format (default: agent)",
    )
    parser.add_argument(
        "--min-coverage",
        type=float,
        default=0.0,
        help="Only report classes below this %% line coverage (0 = report all gaps)",
    )
    parser.add_argument(
        "--package-filter", "-p",
        default=None,
        help="Only report classes in this package prefix (e.g. com/example/service)",
    )
    args = parser.parse_args()
    xml_path = Path(args.xml_file)
    if not xml_path.exists():
        print(f"ERROR: File not found: {xml_path}", file=sys.stderr)
        sys.exit(1)
    classes = parse_jacoco_xml(str(xml_path))
    # Apply package filter
    if args.package_filter:
        prefix = args.package_filter.replace(".", "/")
        classes = [c for c in classes if c.class_name.startswith(prefix)]
    # Apply min-coverage filter
    if args.min_coverage > 0:
        def _line_pct(c: ClassCoverage) -> float:
            total = c.total_lines
            return 100.0 * c.covered_lines / total if total else 100.0
        classes = [c for c in classes if _line_pct(c) < args.min_coverage]
    if not classes:
        print("✅ No coverage gaps found matching the given filters.")
        return
    if args.output == "agent":
        print(format_agent(classes))
    elif args.output == "json":
        print(format_json(classes))
    elif args.output == "markdown":
        print(format_markdown(classes))
 if __name__ == "__main__":
    main()
@@ -0,0 +1,2 @@
 ##  (2026-03-27)
 ##  (2026-03-28)
@@ -49,9 +49,10 @@ dependencies {
    testImplementation(platform("org.junit:junit-bom:5.13.4"))
    testImplementation("org.junit.jupiter:junit-jupiter")
    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
    testImplementation("org.scalatest:scalatest_3:${versions["SCALATEST"]!!}")
    testImplementation("co.helmethair:scalatest-junit-runner:${versions["SCALATEST_JUNIT"]!!}")
    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 }
 tasks.test {
@@ -8,10 +8,12 @@ object Board:
  extension (b: Board)
    def pieceAt(sq: Square): Option[Piece] = b.get(sq)
    def updated(sq: Square, piece: Piece): Board = b.updated(sq, piece)
    def removed(sq: Square): Board = b.removed(sq)
    def withMove(from: Square, to: Square): (Board, Option[Piece]) =
      val captured = b.get(to)
-      val updated  = b.removed(from).updated(to, b(from))
+      val updatedBoard = b.removed(from).updated(to, b(from))
-      (updated, captured)
+      (updatedBoard, captured)
    def pieces: Map[Square, Piece] = b
  val initial: Board =
@@ -0,0 +1,122 @@
 package de.nowchess.api.board
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class BoardTest extends AnyFunSuite with Matchers:
  private val e2 = Square(File.E, Rank.R2)
  private val e4 = Square(File.E, Rank.R4)
  private val d7 = Square(File.D, Rank.R7)
  test("pieceAt returns Some for occupied square") {
    Board.initial.pieceAt(e2) shouldBe Some(Piece.WhitePawn)
  }
  test("pieceAt returns None for empty square") {
    Board.initial.pieceAt(e4) shouldBe None
  }
  test("withMove moves piece and vacates origin") {
    val (board, captured) = Board.initial.withMove(e2, e4)
    captured shouldBe None
    board.pieceAt(e4) shouldBe Some(Piece.WhitePawn)
    board.pieceAt(e2) shouldBe None
  }
  test("withMove returns captured piece when destination is occupied") {
    val from = Square(File.A, Rank.R1)
    val to   = Square(File.A, Rank.R8)
    val b    = Board(Map(from -> Piece.WhiteRook, to -> Piece.BlackRook))
    val (board, captured) = b.withMove(from, to)
    captured shouldBe Some(Piece.BlackRook)
    board.pieceAt(to) shouldBe Some(Piece.WhiteRook)
    board.pieceAt(from) shouldBe None
  }
  test("pieces returns the underlying map") {
    val map = Map(e2 -> Piece.WhitePawn)
    val b   = Board(map)
    b.pieces shouldBe map
  }
  test("Board.apply constructs board from map") {
    val map = Map(e2 -> Piece.WhitePawn)
    val b   = Board(map)
    b.pieceAt(e2) shouldBe Some(Piece.WhitePawn)
  }
  test("initial board has 32 pieces") {
    Board.initial.pieces should have size 32
  }
  test("initial board has 16 white pieces") {
    Board.initial.pieces.values.count(_.color == Color.White) shouldBe 16
  }
  test("initial board has 16 black pieces") {
    Board.initial.pieces.values.count(_.color == Color.Black) shouldBe 16
  }
  test("initial board white pawns on rank 2") {
    File.values.foreach { file =>
      Board.initial.pieceAt(Square(file, Rank.R2)) shouldBe Some(Piece.WhitePawn)
    }
  }
  test("initial board black pawns on rank 7") {
    File.values.foreach { file =>
      Board.initial.pieceAt(Square(file, Rank.R7)) shouldBe Some(Piece.BlackPawn)
    }
  }
  test("initial board white back rank") {
    val expectedBackRank = Vector(
      PieceType.Rook, PieceType.Knight, PieceType.Bishop, PieceType.Queen,
      PieceType.King, PieceType.Bishop, PieceType.Knight, PieceType.Rook
    )
    File.values.zipWithIndex.foreach { (file, i) =>
      Board.initial.pieceAt(Square(file, Rank.R1)) shouldBe
        Some(Piece(Color.White, expectedBackRank(i)))
    }
  }
  test("initial board black back rank") {
    val expectedBackRank = Vector(
      PieceType.Rook, PieceType.Knight, PieceType.Bishop, PieceType.Queen,
      PieceType.King, PieceType.Bishop, PieceType.Knight, PieceType.Rook
    )
    File.values.zipWithIndex.foreach { (file, i) =>
      Board.initial.pieceAt(Square(file, Rank.R8)) shouldBe
        Some(Piece(Color.Black, expectedBackRank(i)))
    }
  }
  test("ranks 3-6 are empty on initial board") {
    val emptyRanks = Seq(Rank.R3, Rank.R4, Rank.R5, Rank.R6)
    for
      rank <- emptyRanks
      file <- File.values
    do
      Board.initial.pieceAt(Square(file, rank)) shouldBe None
  }
  test("updated adds or replaces piece at square") {
    val b = Board(Map(e2 -> Piece.WhitePawn))
    val updated = b.updated(e4, Piece.WhiteKnight)
    updated.pieceAt(e2) shouldBe Some(Piece.WhitePawn)
    updated.pieceAt(e4) shouldBe Some(Piece.WhiteKnight)
  }
  test("updated replaces existing piece") {
    val b = Board(Map(e2 -> Piece.WhitePawn))
    val updated = b.updated(e2, Piece.WhiteKnight)
    updated.pieceAt(e2) shouldBe Some(Piece.WhiteKnight)
  }
  test("removed deletes piece from board") {
    val b = Board(Map(e2 -> Piece.WhitePawn, e4 -> Piece.WhiteKnight))
    val removed = b.removed(e2)
    removed.pieceAt(e2) shouldBe None
    removed.pieceAt(e4) shouldBe Some(Piece.WhiteKnight)
  }
@@ -0,0 +1,22 @@
 package de.nowchess.api.board
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class ColorTest extends AnyFunSuite with Matchers:
  test("White.opposite returns Black") {
    Color.White.opposite shouldBe Color.Black
  }
  test("Black.opposite returns White") {
    Color.Black.opposite shouldBe Color.White
  }
  test("White.label returns 'White'") {
    Color.White.label shouldBe "White"
  }
  test("Black.label returns 'Black'") {
    Color.Black.label shouldBe "Black"
  }
@@ -0,0 +1,60 @@
 package de.nowchess.api.board
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class PieceTest extends AnyFunSuite with Matchers:
  test("Piece holds color and pieceType") {
    val p = Piece(Color.White, PieceType.Queen)
    p.color    shouldBe Color.White
    p.pieceType shouldBe PieceType.Queen
  }
  test("WhitePawn convenience constant") {
    Piece.WhitePawn shouldBe Piece(Color.White, PieceType.Pawn)
  }
  test("WhiteKnight convenience constant") {
    Piece.WhiteKnight shouldBe Piece(Color.White, PieceType.Knight)
  }
  test("WhiteBishop convenience constant") {
    Piece.WhiteBishop shouldBe Piece(Color.White, PieceType.Bishop)
  }
  test("WhiteRook convenience constant") {
    Piece.WhiteRook shouldBe Piece(Color.White, PieceType.Rook)
  }
  test("WhiteQueen convenience constant") {
    Piece.WhiteQueen shouldBe Piece(Color.White, PieceType.Queen)
  }
  test("WhiteKing convenience constant") {
    Piece.WhiteKing shouldBe Piece(Color.White, PieceType.King)
  }
  test("BlackPawn convenience constant") {
    Piece.BlackPawn shouldBe Piece(Color.Black, PieceType.Pawn)
  }
  test("BlackKnight convenience constant") {
    Piece.BlackKnight shouldBe Piece(Color.Black, PieceType.Knight)
  }
  test("BlackBishop convenience constant") {
    Piece.BlackBishop shouldBe Piece(Color.Black, PieceType.Bishop)
  }
  test("BlackRook convenience constant") {
    Piece.BlackRook shouldBe Piece(Color.Black, PieceType.Rook)
  }
  test("BlackQueen convenience constant") {
    Piece.BlackQueen shouldBe Piece(Color.Black, PieceType.Queen)
  }
  test("BlackKing convenience constant") {
    Piece.BlackKing shouldBe Piece(Color.Black, PieceType.King)
  }
@@ -0,0 +1,30 @@
 package de.nowchess.api.board
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class PieceTypeTest extends AnyFunSuite with Matchers:
  test("Pawn.label returns 'Pawn'") {
    PieceType.Pawn.label shouldBe "Pawn"
  }
  test("Knight.label returns 'Knight'") {
    PieceType.Knight.label shouldBe "Knight"
  }
  test("Bishop.label returns 'Bishop'") {
    PieceType.Bishop.label shouldBe "Bishop"
  }
  test("Rook.label returns 'Rook'") {
    PieceType.Rook.label shouldBe "Rook"
  }
  test("Queen.label returns 'Queen'") {
    PieceType.Queen.label shouldBe "Queen"
  }
  test("King.label returns 'King'") {
    PieceType.King.label shouldBe "King"
  }
@@ -0,0 +1,62 @@
 package de.nowchess.api.board
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class SquareTest extends AnyFunSuite with Matchers:
  test("Square.toString produces lowercase file and rank number") {
    Square(File.E, Rank.R4).toString shouldBe "e4"
  }
  test("Square.toString for a1") {
    Square(File.A, Rank.R1).toString shouldBe "a1"
  }
  test("Square.toString for h8") {
    Square(File.H, Rank.R8).toString shouldBe "h8"
  }
  test("fromAlgebraic parses valid square e4") {
    Square.fromAlgebraic("e4") shouldBe Some(Square(File.E, Rank.R4))
  }
  test("fromAlgebraic parses valid square a1") {
    Square.fromAlgebraic("a1") shouldBe Some(Square(File.A, Rank.R1))
  }
  test("fromAlgebraic parses valid square h8") {
    Square.fromAlgebraic("h8") shouldBe Some(Square(File.H, Rank.R8))
  }
  test("fromAlgebraic is case-insensitive for file") {
    Square.fromAlgebraic("E4") shouldBe Some(Square(File.E, Rank.R4))
  }
  test("fromAlgebraic returns None for empty string") {
    Square.fromAlgebraic("") shouldBe None
  }
  test("fromAlgebraic returns None for string too short") {
    Square.fromAlgebraic("e") shouldBe None
  }
  test("fromAlgebraic returns None for string too long") {
    Square.fromAlgebraic("e42") shouldBe None
  }
  test("fromAlgebraic returns None for invalid file character") {
    Square.fromAlgebraic("z4") shouldBe None
  }
  test("fromAlgebraic returns None for non-digit rank") {
    Square.fromAlgebraic("ex") shouldBe None
  }
  test("fromAlgebraic returns None for rank 0") {
    Square.fromAlgebraic("e0") shouldBe None
  }
  test("fromAlgebraic returns None for rank 9") {
    Square.fromAlgebraic("e9") shouldBe None
  }
@@ -0,0 +1,77 @@
 package de.nowchess.api.game
 import de.nowchess.api.board.Color
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class GameStateTest extends AnyFunSuite with Matchers:
  test("CastlingRights.None has both flags false") {
    CastlingRights.None.kingSide  shouldBe false
    CastlingRights.None.queenSide shouldBe false
  }
  test("CastlingRights.Both has both flags true") {
    CastlingRights.Both.kingSide  shouldBe true
    CastlingRights.Both.queenSide shouldBe true
  }
  test("CastlingRights constructor sets fields") {
    val cr = CastlingRights(kingSide = true, queenSide = false)
    cr.kingSide  shouldBe true
    cr.queenSide shouldBe false
  }
  test("GameResult cases exist") {
    GameResult.WhiteWins shouldBe GameResult.WhiteWins
    GameResult.BlackWins shouldBe GameResult.BlackWins
    GameResult.Draw      shouldBe GameResult.Draw
  }
  test("GameStatus.NotStarted") {
    GameStatus.NotStarted shouldBe GameStatus.NotStarted
  }
  test("GameStatus.InProgress") {
    GameStatus.InProgress shouldBe GameStatus.InProgress
  }
  test("GameStatus.Finished carries result") {
    val status = GameStatus.Finished(GameResult.Draw)
    status shouldBe GameStatus.Finished(GameResult.Draw)
    status match
      case GameStatus.Finished(r) => r shouldBe GameResult.Draw
      case _                      => fail("expected Finished")
  }
  test("GameState.initial has standard FEN piece placement") {
    GameState.initial.piecePlacement shouldBe "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR"
  }
  test("GameState.initial active color is White") {
    GameState.initial.activeColor shouldBe Color.White
  }
  test("GameState.initial white has full castling rights") {
    GameState.initial.castlingWhite shouldBe CastlingRights.Both
  }
  test("GameState.initial black has full castling rights") {
    GameState.initial.castlingBlack shouldBe CastlingRights.Both
  }
  test("GameState.initial en-passant target is None") {
    GameState.initial.enPassantTarget shouldBe None
  }
  test("GameState.initial half-move clock is 0") {
    GameState.initial.halfMoveClock shouldBe 0
  }
  test("GameState.initial full-move number is 1") {
    GameState.initial.fullMoveNumber shouldBe 1
  }
  test("GameState.initial status is InProgress") {
    GameState.initial.status shouldBe GameStatus.InProgress
  }
@@ -0,0 +1,56 @@
 package de.nowchess.api.move
 import de.nowchess.api.board.{File, Rank, Square}
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class MoveTest extends AnyFunSuite with Matchers:
  private val e2 = Square(File.E, Rank.R2)
  private val e4 = Square(File.E, Rank.R4)
  test("Move defaults moveType to Normal") {
    val m = Move(e2, e4)
    m.moveType shouldBe MoveType.Normal
  }
  test("Move stores from and to squares") {
    val m = Move(e2, e4)
    m.from shouldBe e2
    m.to   shouldBe e4
  }
  test("Move with CastleKingside moveType") {
    val m = Move(e2, e4, MoveType.CastleKingside)
    m.moveType shouldBe MoveType.CastleKingside
  }
  test("Move with CastleQueenside moveType") {
    val m = Move(e2, e4, MoveType.CastleQueenside)
    m.moveType shouldBe MoveType.CastleQueenside
  }
  test("Move with EnPassant moveType") {
    val m = Move(e2, e4, MoveType.EnPassant)
    m.moveType shouldBe MoveType.EnPassant
  }
  test("Move with Promotion to Queen") {
    val m = Move(e2, e4, MoveType.Promotion(PromotionPiece.Queen))
    m.moveType shouldBe MoveType.Promotion(PromotionPiece.Queen)
  }
  test("Move with Promotion to Knight") {
    val m = Move(e2, e4, MoveType.Promotion(PromotionPiece.Knight))
    m.moveType shouldBe MoveType.Promotion(PromotionPiece.Knight)
  }
  test("Move with Promotion to Bishop") {
    val m = Move(e2, e4, MoveType.Promotion(PromotionPiece.Bishop))
    m.moveType shouldBe MoveType.Promotion(PromotionPiece.Bishop)
  }
  test("Move with Promotion to Rook") {
    val m = Move(e2, e4, MoveType.Promotion(PromotionPiece.Rook))
    m.moveType shouldBe MoveType.Promotion(PromotionPiece.Rook)
  }
@@ -0,0 +1,23 @@
 package de.nowchess.api.player
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class PlayerInfoTest extends AnyFunSuite with Matchers:
  test("PlayerId.apply wraps a string") {
    val id = PlayerId("player-123")
    id.value shouldBe "player-123"
  }
  test("PlayerId.value unwraps to original string") {
    val raw = "abc-456"
    PlayerId(raw).value shouldBe raw
  }
  test("PlayerInfo holds id and displayName") {
    val id   = PlayerId("p1")
    val info = PlayerInfo(id, "Magnus")
    info.id.value      shouldBe "p1"
    info.displayName   shouldBe "Magnus"
  }
@@ -0,0 +1,62 @@
 package de.nowchess.api.response
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class ApiResponseTest extends AnyFunSuite with Matchers:
  test("ApiResponse.Success carries data") {
    val r = ApiResponse.Success(42)
    r.data shouldBe 42
  }
  test("ApiResponse.Failure carries error list") {
    val err = ApiError("CODE", "msg")
    val r   = ApiResponse.Failure(List(err))
    r.errors shouldBe List(err)
  }
  test("ApiResponse.error creates single-error Failure") {
    val err = ApiError("NOT_FOUND", "not found")
    val f   = ApiResponse.error(err)
    f shouldBe ApiResponse.Failure(List(err))
  }
  test("ApiError holds code and message") {
    val e = ApiError("CODE", "message")
    e.code    shouldBe "CODE"
    e.message shouldBe "message"
    e.field   shouldBe None
  }
  test("ApiError holds optional field") {
    val e = ApiError("INVALID", "bad value", Some("email"))
    e.field shouldBe Some("email")
  }
  test("Pagination.totalPages with exact division") {
    Pagination(page = 0, pageSize = 10, totalItems = 30).totalPages shouldBe 3
  }
  test("Pagination.totalPages rounds up") {
    Pagination(page = 0, pageSize = 10, totalItems = 25).totalPages shouldBe 3
  }
  test("Pagination.totalPages is 0 when totalItems is 0") {
    Pagination(page = 0, pageSize = 10, totalItems = 0).totalPages shouldBe 0
  }
  test("Pagination.totalPages is 0 when pageSize is 0") {
    Pagination(page = 0, pageSize = 0, totalItems = 100).totalPages shouldBe 0
  }
  test("Pagination.totalPages is 0 when pageSize is negative") {
    Pagination(page = 0, pageSize = -1, totalItems = 100).totalPages shouldBe 0
  }
  test("PagedResponse holds items and pagination") {
    val pagination = Pagination(page = 1, pageSize = 5, totalItems = 20)
    val pr         = PagedResponse(List("a", "b"), pagination)
    pr.items      shouldBe List("a", "b")
    pr.pagination shouldBe pagination
  }
@@ -0,0 +1,3 @@
 MAJOR=0
 MINOR=0
 PATCH=2
@@ -0,0 +1,30 @@
 ##  (2026-03-27)
 ### Features
 * add GameRules stub with PositionStatus enum ([76d4168](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/76d4168038de23e5d6083d4e8f0504fbf31d15a3))
 * add MovedInCheck/Checkmate/Stalemate MoveResult variants (stub dispatch) ([8b7ec57](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/8b7ec57e5ea6ee1615a1883848a426dc07d26364))
 * implement GameRules with isInCheck, legalMoves, gameStatus ([94a02ff](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/94a02ff6849436d9496c70a0f16c21666dae8e4e))
 * implement legal castling ([#1](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/1)) ([00d326c](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/00d326c1ba67711fbe180f04e1100c3f01dd0254))
 * wire check/checkmate/stalemate into processMove and gameLoop ([5264a22](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/5264a225418b885c5e6ea6411b96f85e38837f6c))
 ### Bug Fixes
 * add missing kings to gameLoop capture test board ([aedd787](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/aedd787b77203c2af934751dba7b784eaf165032))
 * correct test board positions and captureOutput/withInput interaction ([f0481e2](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/f0481e2561b779df00925b46ee281dc36a795150))
 * update main class path in build configuration and adjust VCS directory mapping ([7b1f8b1](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/7b1f8b117623d327232a1a92a8a44d18582e0189))
 ##  (2026-03-28)
 ### Features
 * add GameRules stub with PositionStatus enum ([76d4168](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/76d4168038de23e5d6083d4e8f0504fbf31d15a3))
 * add MovedInCheck/Checkmate/Stalemate MoveResult variants (stub dispatch) ([8b7ec57](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/8b7ec57e5ea6ee1615a1883848a426dc07d26364))
 * implement GameRules with isInCheck, legalMoves, gameStatus ([94a02ff](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/94a02ff6849436d9496c70a0f16c21666dae8e4e))
 * implement legal castling ([#1](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/1)) ([00d326c](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/00d326c1ba67711fbe180f04e1100c3f01dd0254))
 * wire check/checkmate/stalemate into processMove and gameLoop ([5264a22](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/5264a225418b885c5e6ea6411b96f85e38837f6c))
 ### Bug Fixes
 * add missing kings to gameLoop capture test board ([aedd787](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/aedd787b77203c2af934751dba7b784eaf165032))
 * correct test board positions and captureOutput/withInput interaction ([f0481e2](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/f0481e2561b779df00925b46ee281dc36a795150))
 * update main class path in build configuration and adjust VCS directory mapping ([7b1f8b1](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/7b1f8b117623d327232a1a92a8a44d18582e0189))
@@ -23,7 +23,7 @@ scoverage {
 }
 application {
-    mainClass.set("de.nowchess.chess.chessMain")
+    mainClass.set("de.nowchess.chess.Main")
 }
 tasks.withType<ScalaCompile> {
@@ -52,9 +52,10 @@ dependencies {
    testImplementation(platform("org.junit:junit-bom:5.13.4"))
    testImplementation("org.junit.jupiter:junit-jupiter")
    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
    testImplementation("org.scalatest:scalatest_3:${versions["SCALATEST"]!!}")
    testImplementation("co.helmethair:scalatest-junit-runner:${versions["SCALATEST_JUNIT"]!!}")
    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 }
 tasks.test {
@@ -1,11 +1,12 @@
 package de.nowchess.chess
 import de.nowchess.api.board.Board
 import de.nowchess.api.board.Color
 import de.nowchess.chess.controller.GameController
-import de.nowchess.chess.logic.GameContext
+import de.nowchess.chess.logic.GameHistory
 object Main {
  def main(args: Array[String]): Unit =
    println("NowChess TUI — type moves in coordinate notation (e.g. e2e4). Type 'quit' to exit.")
-    GameController.gameLoop(GameContext.initial, Color.White)
+    GameController.gameLoop(Board.initial, GameHistory.empty, Color.White)
 }
@@ -1,8 +1,8 @@
 package de.nowchess.chess.controller
 import scala.io.StdIn
-import de.nowchess.api.board.{Board, Color, Piece}
+import de.nowchess.api.board.{Board, Color, File, Piece, Rank, Square}
-import de.nowchess.chess.logic.{GameContext, MoveValidator, GameRules, PositionStatus}
+import de.nowchess.chess.logic.*
 import de.nowchess.chess.view.Renderer
 // ---------------------------------------------------------------------------
@@ -16,8 +16,8 @@ object MoveResult:
  case object NoPiece                                                                   extends MoveResult
  case object WrongColor                                                                extends MoveResult
  case object IllegalMove                                                               extends MoveResult
-  case class  Moved(newCtx: GameContext, captured: Option[Piece], newTurn: Color)      extends MoveResult
+  case class  Moved(newBoard: Board, newHistory: GameHistory, captured: Option[Piece], newTurn: Color)      extends MoveResult
-  case class  MovedInCheck(newCtx: GameContext, captured: Option[Piece], newTurn: Color) extends MoveResult
+  case class  MovedInCheck(newBoard: Board, newHistory: GameHistory, captured: Option[Piece], newTurn: Color) extends MoveResult
  case class  Checkmate(winner: Color)                                                  extends MoveResult
  case object Stalemate                                                                 extends MoveResult
@@ -30,7 +30,7 @@ object GameController:
  /** Pure function: interprets one raw input line against the current game context.
   *  Has no I/O side effects — all output must be handled by the caller.
   */
-  def processMove(ctx: GameContext, turn: Color, raw: String): MoveResult =
+  def processMove(board: Board, history: GameHistory, turn: Color, raw: String): MoveResult =
    raw.trim match
      case "quit" | "q" =>
        MoveResult.Quit
@@ -39,62 +39,67 @@ object GameController:
          case None =>
            MoveResult.InvalidFormat(trimmed)
          case Some((from, to)) =>
-            ctx.board.pieceAt(from) match
+            board.pieceAt(from) match
              case None =>
                MoveResult.NoPiece
              case Some(piece) if piece.color != turn =>
                MoveResult.WrongColor
              case Some(_) =>
-                if !MoveValidator.isLegal(ctx, from, to) then
+                if !MoveValidator.isLegal(board, history, from, to) then
                  MoveResult.IllegalMove
                else
-                  val (newBoard, captured) = ctx.board.withMove(from, to)
+                  val castleOpt = if MoveValidator.isCastle(board, from, to)
-                  val newCtx = ctx.copy(board = newBoard)
+                                  then Some(MoveValidator.castleSide(from, to))
-                  GameRules.gameStatus(newCtx, turn.opposite) match
+                                  else None
-                    case PositionStatus.Normal  => MoveResult.Moved(newCtx, captured, turn.opposite)
+                  val (newBoard, captured) = castleOpt match
-                    case PositionStatus.InCheck => MoveResult.MovedInCheck(newCtx, captured, turn.opposite)
+                    case Some(side) => (board.withCastle(turn, side), None)
                    case None       => board.withMove(from, to)
                  val newHistory = history.addMove(from, to, castleOpt)
                  GameRules.gameStatus(newBoard, newHistory, turn.opposite) match
                    case PositionStatus.Normal  => MoveResult.Moved(newBoard, newHistory, captured, turn.opposite)
                    case PositionStatus.InCheck => MoveResult.MovedInCheck(newBoard, newHistory, captured, turn.opposite)
                    case PositionStatus.Mated   => MoveResult.Checkmate(turn)
                    case PositionStatus.Drawn   => MoveResult.Stalemate
  /** Thin I/O shell: renders the board, reads a line, delegates to processMove,
   *  prints the outcome, and recurses until the game ends.
   */
-  def gameLoop(ctx: GameContext, turn: Color): Unit =
+  def gameLoop(board: Board, history: GameHistory, turn: Color): Unit =
    println()
-    print(Renderer.render(ctx.board))
+    print(Renderer.render(board))
    println(s"${turn.label}'s turn. Enter move: ")
    val input = Option(StdIn.readLine()).getOrElse("quit").trim
-    processMove(ctx, turn, input) match
+    processMove(board, history, turn, input) match
      case MoveResult.Quit =>
        println("Game over. Goodbye!")
      case MoveResult.InvalidFormat(raw) =>
        println(s"Invalid move format '$raw'. Use coordinate notation, e.g. e2e4.")
-        gameLoop(ctx, turn)
+        gameLoop(board, history, turn)
      case MoveResult.NoPiece =>
        println(s"No piece on ${Parser.parseMove(input).map(_._1).fold("?")(_.toString)}.")
-        gameLoop(ctx, turn)
+        gameLoop(board, history, turn)
      case MoveResult.WrongColor =>
        println(s"That is not your piece.")
-        gameLoop(ctx, turn)
+        gameLoop(board, history, turn)
      case MoveResult.IllegalMove =>
        println(s"Illegal move.")
-        gameLoop(ctx, turn)
+        gameLoop(board, history, turn)
-      case MoveResult.Moved(newCtx, captured, newTurn) =>
+      case MoveResult.Moved(newBoard, newHistory, captured, newTurn) =>
        val prevTurn = newTurn.opposite
        captured.foreach: cap =>
          val toSq = Parser.parseMove(input).map(_._2).fold("?")(_.toString)
          println(s"${prevTurn.label} captures ${cap.color.label} ${cap.pieceType.label} on $toSq")
-        gameLoop(newCtx, newTurn)
+        gameLoop(newBoard, newHistory, newTurn)
-      case MoveResult.MovedInCheck(newCtx, captured, newTurn) =>
+      case MoveResult.MovedInCheck(newBoard, newHistory, captured, newTurn) =>
        val prevTurn = newTurn.opposite
        captured.foreach: cap =>
          val toSq = Parser.parseMove(input).map(_._2).fold("?")(_.toString)
          println(s"${prevTurn.label} captures ${cap.color.label} ${cap.pieceType.label} on $toSq")
        println(s"${newTurn.label} is in check!")
-        gameLoop(newCtx, newTurn)
+        gameLoop(newBoard, newHistory, newTurn)
      case MoveResult.Checkmate(winner) =>
        println(s"Checkmate! ${winner.label} wins.")
-        gameLoop(GameContext.initial, Color.White)
+        gameLoop(Board.initial, GameHistory.empty, Color.White)
      case MoveResult.Stalemate =>
        println("Stalemate! The game is a draw.")
-        gameLoop(GameContext.initial, Color.White)
+        gameLoop(Board.initial, GameHistory.empty, Color.White)
@@ -0,0 +1,23 @@
 package de.nowchess.chess.logic
 import de.nowchess.api.board.*
 enum CastleSide:
  case Kingside, Queenside
 extension (b: Board)
  def withCastle(color: Color, side: CastleSide): Board =
    val rank = if color == Color.White then Rank.R1 else Rank.R8
    val kingFrom = Square(File.E, rank)
    val (kingTo, rookFrom, rookTo) = side match
      case CastleSide.Kingside =>
        (Square(File.G, rank), Square(File.H, rank), Square(File.F, rank))
      case CastleSide.Queenside =>
        (Square(File.C, rank), Square(File.A, rank), Square(File.D, rank))
    val king = b.pieceAt(kingFrom).get
    val rook = b.pieceAt(rookFrom).get
    b.removed(kingFrom).removed(rookFrom)
      .updated(kingTo, king)
      .updated(rookTo, rook)
@@ -0,0 +1,31 @@
 package de.nowchess.chess.logic
 import de.nowchess.api.board.{Color, File, Rank, Square}
 import de.nowchess.api.game.CastlingRights
 /** Derives castling rights from move history. */
 object CastlingRightsCalculator:
  def deriveCastlingRights(history: GameHistory, color: Color): CastlingRights =
    val (kingRow, kingsideRookFile, queensideRookFile) = color match
      case Color.White => (Rank.R1, File.H, File.A)
      case Color.Black => (Rank.R8, File.H, File.A)
    // Check if king has moved
    val kingHasMoved = history.moves.exists: move =>
      move.from == Square(File.E, kingRow) || move.castleSide.isDefined
    if kingHasMoved then
      CastlingRights.None
    else
      // Check if kingside rook has moved or was captured
      val kingsideLost = history.moves.exists: move =>
        move.from == Square(kingsideRookFile, kingRow) ||
        move.to == Square(kingsideRookFile, kingRow)
      // Check if queenside rook has moved or was captured
      val queensideLost = history.moves.exists: move =>
        move.from == Square(queensideRookFile, kingRow) ||
        move.to == Square(queensideRookFile, kingRow)
      CastlingRights(kingSide = !kingsideLost, queenSide = !queensideLost)
@@ -1,47 +0,0 @@
 package de.nowchess.chess.logic
 import de.nowchess.api.board.{Board, Color, File, Piece, PieceType, Rank, Square}
 import de.nowchess.api.game.CastlingRights
 enum CastleSide:
  case Kingside, Queenside
 case class GameContext(
  board: Board,
  whiteCastling: CastlingRights,
  blackCastling: CastlingRights
 ):
  def castlingFor(color: Color): CastlingRights =
    if color == Color.White then whiteCastling else blackCastling
  def withUpdatedRights(color: Color, rights: CastlingRights): GameContext =
    if color == Color.White then copy(whiteCastling = rights)
    else copy(blackCastling = rights)
 object GameContext:
  /** Convenience constructor for test boards: no castling rights on either side. */
  def apply(board: Board): GameContext =
    GameContext(board, CastlingRights.None, CastlingRights.None)
  val initial: GameContext =
    GameContext(Board.initial, CastlingRights.Both, CastlingRights.Both)
 extension (b: Board)
  def withCastle(color: Color, side: CastleSide): Board =
    val (kingFrom, kingTo, rookFrom, rookTo) = (color, side) match
      case (Color.White, CastleSide.Kingside)  =>
        (Square(File.E, Rank.R1), Square(File.G, Rank.R1),
         Square(File.H, Rank.R1), Square(File.F, Rank.R1))
      case (Color.White, CastleSide.Queenside) =>
        (Square(File.E, Rank.R1), Square(File.C, Rank.R1),
         Square(File.A, Rank.R1), Square(File.D, Rank.R1))
      case (Color.Black, CastleSide.Kingside)  =>
        (Square(File.E, Rank.R8), Square(File.G, Rank.R8),
         Square(File.H, Rank.R8), Square(File.F, Rank.R8))
      case (Color.Black, CastleSide.Queenside) =>
        (Square(File.E, Rank.R8), Square(File.C, Rank.R8),
         Square(File.A, Rank.R8), Square(File.D, Rank.R8))
    val king = Piece(color, PieceType.King)
    val rook = Piece(color, PieceType.Rook)
    Board(b.pieces.removed(kingFrom).removed(rookFrom)
                  .updated(kingTo, king).updated(rookTo, rook))
@@ -0,0 +1,24 @@
 package de.nowchess.chess.logic
 import de.nowchess.api.board.Square
 /** A single move recorded in the game history. Distinct from api.move.Move which represents user intent. */
 case class HistoryMove(
  from: Square,
  to: Square,
  castleSide: Option[CastleSide]
 )
 /** Complete game history: ordered list of moves. */
 case class GameHistory(moves: List[HistoryMove] = List.empty):
  def addMove(move: HistoryMove): GameHistory =
    GameHistory(moves :+ move)
  def addMove(from: Square, to: Square): GameHistory =
    addMove(HistoryMove(from, to, None))
  def addMove(from: Square, to: Square, castleSide: Option[CastleSide]): GameHistory =
    addMove(HistoryMove(from, to, castleSide))
 object GameHistory:
  val empty: GameHistory = GameHistory()
@@ -1,7 +1,7 @@
 package de.nowchess.chess.logic
 import de.nowchess.api.board.*
-import de.nowchess.chess.logic.GameContext
+import de.nowchess.chess.logic.GameHistory
 enum PositionStatus:
  case Normal, InCheck, Mated, Drawn
@@ -20,17 +20,17 @@ object GameRules:
      }
  /** All (from, to) moves for `color` that do not leave their own king in check. */
-  def legalMoves(ctx: GameContext, color: Color): Set[(Square, Square)] =
+  def legalMoves(board: Board, history: GameHistory, color: Color): Set[(Square, Square)] =
-    ctx.board.pieces
+    board.pieces
      .collect { case (from, piece) if piece.color == color => from }
      .flatMap { from =>
-        MoveValidator.legalTargets(ctx, from)           // context-aware: includes castling
+        MoveValidator.legalTargets(board, history, from)           // context-aware: includes castling
          .filter { to =>
            val newBoard =
-              if MoveValidator.isCastle(ctx.board, from, to) then
+              if MoveValidator.isCastle(board, from, to) then
-                ctx.board.withCastle(color, MoveValidator.castleSide(from, to))
+                board.withCastle(color, MoveValidator.castleSide(from, to))
              else
-                ctx.board.withMove(from, to)._1
+                board.withMove(from, to)._1
            !isInCheck(newBoard, color)
          }
          .map(to => from -> to)
@@ -38,9 +38,9 @@ object GameRules:
      .toSet
  /** Position status for the side whose turn it is (`color`). */
-  def gameStatus(ctx: GameContext, color: Color): PositionStatus =
+  def gameStatus(board: Board, history: GameHistory, color: Color): PositionStatus =
-    val moves   = legalMoves(ctx, color)
+    val moves   = legalMoves(board, history, color)
-    val inCheck = isInCheck(ctx.board, color)
+    val inCheck = isInCheck(board, color)
    if moves.isEmpty && inCheck then PositionStatus.Mated
    else if moves.isEmpty       then PositionStatus.Drawn
    else if inCheck             then PositionStatus.InCheck
@@ -1,7 +1,7 @@
 package de.nowchess.chess.logic
 import de.nowchess.api.board.*
-import de.nowchess.chess.logic.{GameContext, CastleSide}
+import de.nowchess.chess.logic.{CastleSide, GameHistory}
 object MoveValidator:
@@ -126,42 +126,37 @@ object MoveValidator:
  def castleSide(from: Square, to: Square): CastleSide =
    if to.file.ordinal > from.file.ordinal then CastleSide.Kingside else CastleSide.Queenside
-  def castlingTargets(ctx: GameContext, color: Color): Set[Square] =
+  def castlingTargets(board: Board, history: GameHistory, color: Color): Set[Square] =
-    val rights = ctx.castlingFor(color)
+    val rights = CastlingRightsCalculator.deriveCastlingRights(history, color)
    val rank   = if color == Color.White then Rank.R1 else Rank.R8
    val kingSq = Square(File.E, rank)
    val enemy  = color.opposite
-    if ctx.board.pieceAt(kingSq) != Some(Piece(color, PieceType.King)) then return Set.empty
+    if !board.pieceAt(kingSq).contains(Piece(color, PieceType.King)) ||
-    if GameRules.isInCheck(ctx.board, color) then return Set.empty
+       GameRules.isInCheck(board, color) then Set.empty
    else
      val kingsideSq = Option.when(
        rights.kingSide &&
        board.pieceAt(Square(File.H, rank)).contains(Piece(color, PieceType.Rook)) &&
        List(Square(File.F, rank), Square(File.G, rank)).forall(s => board.pieceAt(s).isEmpty) &&
        !List(Square(File.F, rank), Square(File.G, rank)).exists(s => isAttackedBy(board, s, enemy))
      )(Square(File.G, rank))
-    var result = Set.empty[Square]
+      val queensideSq = Option.when(
        rights.queenSide &&
        board.pieceAt(Square(File.A, rank)).contains(Piece(color, PieceType.Rook)) &&
        List(Square(File.B, rank), Square(File.C, rank), Square(File.D, rank)).forall(s => board.pieceAt(s).isEmpty) &&
        !List(Square(File.D, rank), Square(File.C, rank)).exists(s => isAttackedBy(board, s, enemy))
      )(Square(File.C, rank))
-    if rights.kingSide then
+      kingsideSq.toSet ++ queensideSq.toSet
      val rookSq  = Square(File.H, rank)
      val transit = List(Square(File.F, rank), Square(File.G, rank))
      if ctx.board.pieceAt(rookSq).contains(Piece(color, PieceType.Rook)) &&
         transit.forall(s => ctx.board.pieceAt(s).isEmpty) &&
         !transit.exists(s => isAttackedBy(ctx.board, s, enemy)) then
        result += Square(File.G, rank)
-    if rights.queenSide then
+  def legalTargets(board: Board, history: GameHistory, from: Square): Set[Square] =
-      val rookSq       = Square(File.A, rank)
+    board.pieceAt(from) match
      val emptySquares = List(Square(File.B, rank), Square(File.C, rank), Square(File.D, rank))
      val transitSqs   = List(Square(File.D, rank), Square(File.C, rank))
      if ctx.board.pieceAt(rookSq).contains(Piece(color, PieceType.Rook)) &&
         emptySquares.forall(s => ctx.board.pieceAt(s).isEmpty) &&
         !transitSqs.exists(s => isAttackedBy(ctx.board, s, enemy)) then
        result += Square(File.C, rank)
    result
  def legalTargets(ctx: GameContext, from: Square): Set[Square] =
    ctx.board.pieceAt(from) match
      case Some(piece) if piece.pieceType == PieceType.King =>
-        legalTargets(ctx.board, from) ++ castlingTargets(ctx, piece.color)
+        legalTargets(board, from) ++ castlingTargets(board, history, piece.color)
      case _ =>
-        legalTargets(ctx.board, from)
+        legalTargets(board, from)
-  def isLegal(ctx: GameContext, from: Square, to: Square): Boolean =
+  def isLegal(board: Board, history: GameHistory, from: Square, to: Square): Boolean =
-    legalTargets(ctx, from).contains(to)
+    legalTargets(board, history, from).contains(to)
@@ -11,21 +11,18 @@ object Renderer:
  private val AnsiBlackPiece  = "\u001b[30m"         // black text
  def render(board: Board): String =
-    val sb = new StringBuilder
+    val rows = (0 until 8).reverse.map { rank =>
-    sb.append("  a  b  c  d  e  f  g  h\n")
+      val cells = (0 until 8).map { file =>
-    for rank <- (0 until 8).reverse do
+        val sq        = Square(File.values(file), Rank.values(rank))
-      sb.append(s"${rank + 1} ")
+        val isLightSq = (file + rank) % 2 != 0
-      for file <- 0 until 8 do
+        val bgColor   = if isLightSq then AnsiLightSquare else AnsiDarkSquare
-        val sq          = Square(File.values(file), Rank.values(rank))
+        board.pieceAt(sq) match
        val isLightSq   = (file + rank) % 2 != 0
        val bgColor     = if isLightSq then AnsiLightSquare else AnsiDarkSquare
        val cellContent = board.pieceAt(sq) match
          case Some(piece) =>
            val fgColor = if piece.color == Color.White then AnsiWhitePiece else AnsiBlackPiece
            s"$bgColor$fgColor ${piece.unicode} $AnsiReset"
          case None =>
            s"$bgColor   $AnsiReset"
-        sb.append(cellContent)
+      }.mkString
-      sb.append(s" ${rank + 1}\n")
+      s"${rank + 1} $cells ${rank + 1}"
-    sb.append("  a  b  c  d  e  f  g  h\n")
+    }.mkString("\n")
-    sb.toString
+    s"  a  b  c  d  e  f  g  h\n$rows\n  a  b  c  d  e  f  g  h\n"
@@ -2,7 +2,7 @@ package de.nowchess.chess.controller
 import de.nowchess.api.board.*
 import de.nowchess.api.game.CastlingRights
-import de.nowchess.chess.logic.{GameContext, CastleSide}
+import de.nowchess.chess.logic.{CastleSide, GameHistory}
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
@@ -11,54 +11,61 @@ import java.io.ByteArrayInputStream
 class GameControllerTest extends AnyFunSuite with Matchers:
  private def sq(f: File, r: Rank): Square = Square(f, r)
-  private val initial = GameContext.initial
+  private def processMove(board: Board, history: GameHistory, turn: Color, raw: String): MoveResult =
    GameController.processMove(board, history, turn, raw)
  private def gameLoop(board: Board, history: GameHistory, turn: Color): Unit =
    GameController.gameLoop(board, history, turn)
  private def castlingRights(history: GameHistory, color: Color): CastlingRights =
    de.nowchess.chess.logic.CastlingRightsCalculator.deriveCastlingRights(history, color)
  // ──── processMove ────────────────────────────────────────────────────
  test("processMove: 'quit' input returns Quit"):
-    GameController.processMove(initial, Color.White, "quit") shouldBe MoveResult.Quit
+    processMove(Board.initial, GameHistory.empty, Color.White, "quit") shouldBe MoveResult.Quit
  test("processMove: 'q' input returns Quit"):
-    GameController.processMove(initial, Color.White, "q") shouldBe MoveResult.Quit
+    processMove(Board.initial, GameHistory.empty, Color.White, "q") shouldBe MoveResult.Quit
  test("processMove: quit with surrounding whitespace returns Quit"):
-    GameController.processMove(initial, Color.White, "  quit  ") shouldBe MoveResult.Quit
+    processMove(Board.initial, GameHistory.empty, Color.White, "  quit  ") shouldBe MoveResult.Quit
  test("processMove: unparseable input returns InvalidFormat"):
-    GameController.processMove(initial, Color.White, "xyz") shouldBe MoveResult.InvalidFormat("xyz")
+    processMove(Board.initial, GameHistory.empty, Color.White, "xyz") shouldBe MoveResult.InvalidFormat("xyz")
  test("processMove: valid format but empty square returns NoPiece"):
    // E3 is empty in the initial position
-    GameController.processMove(initial, Color.White, "e3e4") shouldBe MoveResult.NoPiece
+    processMove(Board.initial, GameHistory.empty, Color.White, "e3e4") shouldBe MoveResult.NoPiece
  test("processMove: piece of wrong color returns WrongColor"):
    // E7 has a Black pawn; it is White's turn
-    GameController.processMove(initial, Color.White, "e7e6") shouldBe MoveResult.WrongColor
+    processMove(Board.initial, GameHistory.empty, Color.White, "e7e6") shouldBe MoveResult.WrongColor
  test("processMove: geometrically illegal move returns IllegalMove"):
    // White pawn at E2 cannot jump three squares to E5
-    GameController.processMove(initial, Color.White, "e2e5") shouldBe MoveResult.IllegalMove
+    processMove(Board.initial, GameHistory.empty, Color.White, "e2e5") shouldBe MoveResult.IllegalMove
  test("processMove: legal pawn move returns Moved with updated board and flipped turn"):
-    GameController.processMove(initial, Color.White, "e2e4") match
+    processMove(Board.initial, GameHistory.empty, Color.White, "e2e4") match
-      case MoveResult.Moved(newCtx, captured, newTurn) =>
+      case MoveResult.Moved(newBoard, newHistory, captured, newTurn) =>
-        newCtx.board.pieceAt(sq(File.E, Rank.R4)) shouldBe Some(Piece.WhitePawn)
+        newBoard.pieceAt(sq(File.E, Rank.R4)) shouldBe Some(Piece.WhitePawn)
-        newCtx.board.pieceAt(sq(File.E, Rank.R2)) shouldBe None
+        newBoard.pieceAt(sq(File.E, Rank.R2)) shouldBe None
        captured shouldBe None
        newTurn shouldBe Color.Black
      case other => fail(s"Expected Moved, got $other")
  test("processMove: legal capture returns Moved with the captured piece"):
-    val captureCtx = GameContext(Board(Map(
+    val board = Board(Map(
      sq(File.E, Rank.R5) -> Piece.WhitePawn,
      sq(File.D, Rank.R6) -> Piece.BlackPawn,
      sq(File.H, Rank.R1) -> Piece.BlackKing,
      sq(File.H, Rank.R8) -> Piece.WhiteKing
-    )))
+    ))
-    GameController.processMove(captureCtx, Color.White, "e5d6") match
+    processMove(board, GameHistory.empty, Color.White, "e5d6") match
-      case MoveResult.Moved(newCtx, captured, newTurn) =>
+      case MoveResult.Moved(newBoard, newHistory, captured, newTurn) =>
        captured shouldBe Some(Piece.BlackPawn)
-        newCtx.board.pieceAt(sq(File.D, Rank.R6)) shouldBe Some(Piece.WhitePawn)
+        newBoard.pieceAt(sq(File.D, Rank.R6)) shouldBe Some(Piece.WhitePawn)
        newTurn shouldBe Color.Black
      case other => fail(s"Expected Moved, got $other")
@@ -70,33 +77,33 @@ class GameControllerTest extends AnyFunSuite with Matchers:
  test("gameLoop: 'quit' exits cleanly without exception"):
    withInput("quit\n"):
-      GameController.gameLoop(GameContext.initial, Color.White)
+      gameLoop(Board.initial, GameHistory.empty, Color.White)
  test("gameLoop: EOF (null readLine) exits via quit fallback"):
    withInput(""):
-      GameController.gameLoop(GameContext.initial, Color.White)
+      gameLoop(Board.initial, GameHistory.empty, Color.White)
  test("gameLoop: invalid format prints message and recurses until quit"):
    withInput("badmove\nquit\n"):
-      GameController.gameLoop(GameContext.initial, Color.White)
+      gameLoop(Board.initial, GameHistory.empty, Color.White)
  test("gameLoop: NoPiece prints message and recurses until quit"):
    // E3 is empty in the initial position
    withInput("e3e4\nquit\n"):
-      GameController.gameLoop(GameContext.initial, Color.White)
+      gameLoop(Board.initial, GameHistory.empty, Color.White)
  test("gameLoop: WrongColor prints message and recurses until quit"):
    // E7 has a Black pawn; it is White's turn
    withInput("e7e6\nquit\n"):
-      GameController.gameLoop(GameContext.initial, Color.White)
+      gameLoop(Board.initial, GameHistory.empty, Color.White)
  test("gameLoop: IllegalMove prints message and recurses until quit"):
    withInput("e2e5\nquit\n"):
-      GameController.gameLoop(GameContext.initial, Color.White)
+      gameLoop(Board.initial, GameHistory.empty, Color.White)
  test("gameLoop: legal non-capture move recurses with new board then quits"):
    withInput("e2e4\nquit\n"):
-      GameController.gameLoop(GameContext.initial, Color.White)
+      gameLoop(Board.initial, GameHistory.empty, Color.White)
  test("gameLoop: capture move prints capture message then recurses and quits"):
    val captureBoard = Board(Map(
@@ -106,7 +113,7 @@ class GameControllerTest extends AnyFunSuite with Matchers:
      sq(File.H, Rank.R8) -> Piece.WhiteKing
    ))
    withInput("e5d6\nquit\n"):
-      GameController.gameLoop(GameContext(captureBoard), Color.White)
+      gameLoop(captureBoard, GameHistory.empty, Color.White)
  // ──── helpers ────────────────────────────────────────────────────────
@@ -120,37 +127,37 @@ class GameControllerTest extends AnyFunSuite with Matchers:
  test("processMove: legal move that delivers check returns MovedInCheck"):
    // White Ra1, Ka3; Black Kh8 — White plays Ra1-Ra8, Ra8 attacks rank 8 putting Kh8 in check
    // Kh8 can escape to g7/g8/h7 so this is InCheck, not Mated
-    val ctx = GameContext(Board(Map(
+    val b = Board(Map(
      sq(File.A, Rank.R1) -> Piece.WhiteRook,
      sq(File.C, Rank.R3) -> Piece.WhiteKing,
      sq(File.H, Rank.R8) -> Piece.BlackKing
-    )))
+    ))
-    GameController.processMove(ctx, Color.White, "a1a8") match
+    processMove(b, GameHistory.empty, Color.White, "a1a8") match
-      case MoveResult.MovedInCheck(_, _, newTurn) => newTurn shouldBe Color.Black
+      case MoveResult.MovedInCheck(_, _, _, newTurn) => newTurn shouldBe Color.Black
      case other => fail(s"Expected MovedInCheck, got $other")
  test("processMove: legal move that results in checkmate returns Checkmate"):
    // White Qa1, Ka6; Black Ka8 — White plays Qa1-Qh8 (diagonal a1→h8)
    // After Qh8: White Qh8 + Ka6 vs Black Ka8 = checkmate (spec-verified position)
    // Qa1 does NOT currently attack Ka8 — path along file A is blocked by Ka6
-    val ctx = GameContext(Board(Map(
+    val b = Board(Map(
      sq(File.A, Rank.R1) -> Piece.WhiteQueen,
      sq(File.A, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
-    )))
+    ))
-    GameController.processMove(ctx, Color.White, "a1h8") match
+    processMove(b, GameHistory.empty, Color.White, "a1h8") match
      case MoveResult.Checkmate(winner) => winner shouldBe Color.White
      case other => fail(s"Expected Checkmate(White), got $other")
  test("processMove: legal move that results in stalemate returns Stalemate"):
    // White Qb1, Kc6; Black Ka8 — White plays Qb1-Qb6
    // After Qb6: White Qb6 + Kc6 vs Black Ka8 = stalemate (spec-verified position)
-    val ctx = GameContext(Board(Map(
+    val b = Board(Map(
      sq(File.B, Rank.R1) -> Piece.WhiteQueen,
      sq(File.C, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
-    )))
+    ))
-    GameController.processMove(ctx, Color.White, "b1b6") match
+    processMove(b, GameHistory.empty, Color.White, "b1b6") match
      case MoveResult.Stalemate => succeed
      case other => fail(s"Expected Stalemate, got $other")
@@ -165,7 +172,7 @@ class GameControllerTest extends AnyFunSuite with Matchers:
    ))
    val output = captureOutput:
      withInput("a1h8\nquit\n"):
-        GameController.gameLoop(GameContext(b), Color.White)
+        gameLoop(b, GameHistory.empty, Color.White)
    output should include("Checkmate! White wins.")
  test("gameLoop: stalemate prints draw message and resets to new game"):
@@ -176,7 +183,7 @@ class GameControllerTest extends AnyFunSuite with Matchers:
    ))
    val output = captureOutput:
      withInput("b1b6\nquit\n"):
-        GameController.gameLoop(GameContext(b), Color.White)
+        gameLoop(b, GameHistory.empty, Color.White)
    output should include("Stalemate! The game is a draw.")
  test("gameLoop: MovedInCheck without capture prints check message"):
@@ -187,7 +194,7 @@ class GameControllerTest extends AnyFunSuite with Matchers:
    ))
    val output = captureOutput:
      withInput("a1a8\nquit\n"):
-        GameController.gameLoop(GameContext(b), Color.White)
+        gameLoop(b, GameHistory.empty, Color.White)
    output should include("Black is in check!")
  test("gameLoop: MovedInCheck with capture prints both capture and check message"):
@@ -200,6 +207,161 @@ class GameControllerTest extends AnyFunSuite with Matchers:
    ))
    val output = captureOutput:
      withInput("a1a8\nquit\n"):
-        GameController.gameLoop(GameContext(b), Color.White)
+        gameLoop(b, GameHistory.empty, Color.White)
    output should include("captures")
    output should include("Black is in check!")
  // ──── castling execution ─────────────────────────────────────────────
  test("processMove: e1g1 returns Moved with king on g1 and rook on f1"):
    val b = Board(Map(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.H, Rank.R1) -> Piece.WhiteRook,
        sq(File.H, Rank.R8) -> Piece.BlackKing
      ))
    processMove(b, GameHistory.empty, Color.White, "e1g1") match
      case MoveResult.Moved(newBoard, newHistory, captured, newTurn) =>
        newBoard.pieceAt(sq(File.G, Rank.R1)) shouldBe Some(Piece.WhiteKing)
        newBoard.pieceAt(sq(File.F, Rank.R1)) shouldBe Some(Piece.WhiteRook)
        newBoard.pieceAt(sq(File.E, Rank.R1)) shouldBe None
        newBoard.pieceAt(sq(File.H, Rank.R1)) shouldBe None
        captured shouldBe None
        newTurn shouldBe Color.Black
      case other => fail(s"Expected Moved, got $other")
  test("processMove: e1c1 returns Moved with king on c1 and rook on d1"):
    val b = Board(Map(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.A, Rank.R1) -> Piece.WhiteRook,
        sq(File.H, Rank.R8) -> Piece.BlackKing
      ))
    processMove(b, GameHistory.empty, Color.White, "e1c1") match
      case MoveResult.Moved(newBoard, _, _, _) =>
        newBoard.pieceAt(sq(File.C, Rank.R1)) shouldBe Some(Piece.WhiteKing)
        newBoard.pieceAt(sq(File.D, Rank.R1)) shouldBe Some(Piece.WhiteRook)
      case other => fail(s"Expected Moved, got $other")
  // ──── rights revocation ──────────────────────────────────────────────
  test("processMove: e1g1 revokes both white castling rights"):
    val b = Board(Map(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.H, Rank.R1) -> Piece.WhiteRook,
        sq(File.H, Rank.R8) -> Piece.BlackKing
      ))
    processMove(b, GameHistory.empty, Color.White, "e1g1") match
      case MoveResult.Moved(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.White) shouldBe CastlingRights.None
      case other => fail(s"Expected Moved, got $other")
  test("processMove: moving rook from h1 revokes white kingside right"):
    val b = Board(Map(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.H, Rank.R1) -> Piece.WhiteRook,
        sq(File.H, Rank.R8) -> Piece.BlackKing
      ))
    processMove(b, GameHistory.empty, Color.White, "h1h4") match
      case MoveResult.Moved(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.White).kingSide  shouldBe false
        castlingRights(newHistory, Color.White).queenSide shouldBe true
      case MoveResult.MovedInCheck(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.White).kingSide  shouldBe false
        castlingRights(newHistory, Color.White).queenSide shouldBe true
      case other => fail(s"Expected Moved or MovedInCheck, got $other")
  test("processMove: moving king from e1 revokes both white rights"):
    val b = Board(Map(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.H, Rank.R8) -> Piece.BlackKing
      ))
    processMove(b, GameHistory.empty, Color.White, "e1e2") match
      case MoveResult.Moved(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.White) shouldBe CastlingRights.None
      case other => fail(s"Expected Moved, got $other")
  test("processMove: enemy capture on h1 revokes white kingside right"):
    val b = Board(Map(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.H, Rank.R1) -> Piece.WhiteRook,
        sq(File.H, Rank.R2) -> Piece.BlackRook,
        sq(File.A, Rank.R8) -> Piece.BlackKing
      ))
    processMove(b, GameHistory.empty, Color.Black, "h2h1") match
      case MoveResult.Moved(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.White).kingSide shouldBe false
      case MoveResult.MovedInCheck(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.White).kingSide shouldBe false
      case other => fail(s"Expected Moved or MovedInCheck, got $other")
  test("processMove: castle attempt when rights revoked returns IllegalMove"):
    val b = Board(Map(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.H, Rank.R1) -> Piece.WhiteRook,
        sq(File.H, Rank.R8) -> Piece.BlackKing
      ))
    val history = GameHistory.empty.addMove(sq(File.E, Rank.R1), sq(File.E, Rank.R2)).addMove(sq(File.E, Rank.R2), sq(File.E, Rank.R1))
    processMove(b, history, Color.White, "e1g1") shouldBe MoveResult.IllegalMove
  test("processMove: castle attempt when rook not on home square returns IllegalMove"):
    val b = Board(Map(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.G, Rank.R1) -> Piece.WhiteRook,
        sq(File.H, Rank.R8) -> Piece.BlackKing
      ))
    processMove(b, GameHistory.empty, Color.White, "e1g1") shouldBe MoveResult.IllegalMove
  test("processMove: moving king from e8 revokes both black rights"):
    val b = Board(Map(
        sq(File.E, Rank.R8) -> Piece.BlackKing,
        sq(File.H, Rank.R1) -> Piece.WhiteKing
      ))
    processMove(b, GameHistory.empty, Color.Black, "e8e7") match
      case MoveResult.Moved(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.Black) shouldBe CastlingRights.None
      case MoveResult.MovedInCheck(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.Black) shouldBe CastlingRights.None
      case other => fail(s"Expected Moved or MovedInCheck, got $other")
  test("processMove: moving rook from a8 revokes black queenside right"):
    val b = Board(Map(
        sq(File.E, Rank.R8) -> Piece.BlackKing,
        sq(File.A, Rank.R8) -> Piece.BlackRook,
        sq(File.H, Rank.R1) -> Piece.WhiteKing
      ))
    processMove(b, GameHistory.empty, Color.Black, "a8a1") match
      case MoveResult.Moved(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.Black).queenSide shouldBe false
        castlingRights(newHistory, Color.Black).kingSide  shouldBe true
      case MoveResult.MovedInCheck(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.Black).queenSide shouldBe false
        castlingRights(newHistory, Color.Black).kingSide  shouldBe true
      case other => fail(s"Expected Moved or MovedInCheck, got $other")
  test("processMove: moving rook from h8 revokes black kingside right"):
    val b = Board(Map(
        sq(File.E, Rank.R8) -> Piece.BlackKing,
        sq(File.H, Rank.R8) -> Piece.BlackRook,
        sq(File.A, Rank.R1) -> Piece.WhiteKing
      ))
    processMove(b, GameHistory.empty, Color.Black, "h8h4") match
      case MoveResult.Moved(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.Black).kingSide  shouldBe false
        castlingRights(newHistory, Color.Black).queenSide shouldBe true
      case MoveResult.MovedInCheck(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.Black).kingSide  shouldBe false
        castlingRights(newHistory, Color.Black).queenSide shouldBe true
      case other => fail(s"Expected Moved or MovedInCheck, got $other")
  test("processMove: enemy capture on a1 revokes white queenside right"):
    val b = Board(Map(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.A, Rank.R1) -> Piece.WhiteRook,
        sq(File.A, Rank.R2) -> Piece.BlackRook,
        sq(File.H, Rank.R8) -> Piece.BlackKing
      ))
    processMove(b, GameHistory.empty, Color.Black, "a2a1") match
      case MoveResult.Moved(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.White).queenSide shouldBe false
      case MoveResult.MovedInCheck(_, newHistory, _, _) =>
        castlingRights(newHistory, Color.White).queenSide shouldBe false
      case other => fail(s"Expected Moved or MovedInCheck, got $other")
@@ -0,0 +1,70 @@
 package de.nowchess.chess.logic
 import de.nowchess.api.board.*
 import de.nowchess.api.game.CastlingRights
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class CastlingRightsCalculatorTest extends AnyFunSuite with Matchers:
  private def sq(f: File, r: Rank): Square = Square(f, r)
  test("Empty history gives full castling rights"):
    val rights = CastlingRightsCalculator.deriveCastlingRights(GameHistory.empty, Color.White)
    rights shouldBe CastlingRights.Both
  test("White loses kingside rights after h1 rook moves"):
    val history = GameHistory.empty.addMove(sq(File.H, Rank.R1), sq(File.H, Rank.R2))
    val rights = CastlingRightsCalculator.deriveCastlingRights(history, Color.White)
    rights.kingSide shouldBe false
    rights.queenSide shouldBe true
  test("White loses queenside rights after a1 rook moves"):
    val history = GameHistory.empty.addMove(sq(File.A, Rank.R1), sq(File.A, Rank.R2))
    val rights = CastlingRightsCalculator.deriveCastlingRights(history, Color.White)
    rights.queenSide shouldBe false
    rights.kingSide shouldBe true
  test("White loses all rights after king moves"):
    val history = GameHistory.empty.addMove(sq(File.E, Rank.R1), sq(File.E, Rank.R2))
    val rights = CastlingRightsCalculator.deriveCastlingRights(history, Color.White)
    rights shouldBe CastlingRights.None
  test("Black loses kingside rights after h8 rook moves"):
    val history = GameHistory.empty.addMove(sq(File.H, Rank.R8), sq(File.H, Rank.R7))
    val rights = CastlingRightsCalculator.deriveCastlingRights(history, Color.Black)
    rights.kingSide shouldBe false
    rights.queenSide shouldBe true
  test("Black loses queenside rights after a8 rook moves"):
    val history = GameHistory.empty.addMove(sq(File.A, Rank.R8), sq(File.A, Rank.R7))
    val rights = CastlingRightsCalculator.deriveCastlingRights(history, Color.Black)
    rights.queenSide shouldBe false
    rights.kingSide shouldBe true
  test("Black loses all rights after king moves"):
    val history = GameHistory.empty.addMove(sq(File.E, Rank.R8), sq(File.E, Rank.R7))
    val rights = CastlingRightsCalculator.deriveCastlingRights(history, Color.Black)
    rights shouldBe CastlingRights.None
  test("Castle move revokes all castling rights"):
    val history = GameHistory.empty.addMove(
      sq(File.E, Rank.R1),
      sq(File.G, Rank.R1),
      Some(CastleSide.Kingside)
    )
    val rights = CastlingRightsCalculator.deriveCastlingRights(history, Color.White)
    rights shouldBe CastlingRights.None
  test("Other pieces moving does not revoke castling rights"):
    val history = GameHistory.empty.addMove(sq(File.E, Rank.R2), sq(File.E, Rank.R4))
    val rights = CastlingRightsCalculator.deriveCastlingRights(history, Color.White)
    rights shouldBe CastlingRights.Both
  test("Multiple moves preserve white kingside but lose queenside"):
    val history = GameHistory.empty
      .addMove(sq(File.A, Rank.R1), sq(File.A, Rank.R2))  // White queenside rook moves
      .addMove(sq(File.E, Rank.R7), sq(File.E, Rank.R5))  // Black pawn moves
    val rights = CastlingRightsCalculator.deriveCastlingRights(history, Color.White)
    rights.kingSide shouldBe true
    rights.queenSide shouldBe false
@@ -1,81 +0,0 @@
 package de.nowchess.chess.logic
 import de.nowchess.api.board.*
 import de.nowchess.api.game.CastlingRights
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class GameContextTest extends AnyFunSuite with Matchers:
  private def sq(f: File, r: Rank): Square = Square(f, r)
  private def board(entries: (Square, Piece)*): Board = Board(entries.toMap)
  test("GameContext.initial has Board.initial and CastlingRights.Both for both sides"):
    GameContext.initial.board         shouldBe Board.initial
    GameContext.initial.whiteCastling shouldBe CastlingRights.Both
    GameContext.initial.blackCastling shouldBe CastlingRights.Both
  test("castlingFor returns white rights for Color.White"):
    GameContext.initial.castlingFor(Color.White) shouldBe CastlingRights.Both
  test("castlingFor returns black rights for Color.Black"):
    GameContext.initial.castlingFor(Color.Black) shouldBe CastlingRights.Both
  test("withUpdatedRights updates white castling without touching black"):
    val ctx = GameContext.initial.withUpdatedRights(Color.White, CastlingRights.None)
    ctx.whiteCastling shouldBe CastlingRights.None
    ctx.blackCastling shouldBe CastlingRights.Both
  test("withUpdatedRights updates black castling without touching white"):
    val ctx = GameContext.initial.withUpdatedRights(Color.Black, CastlingRights.None)
    ctx.blackCastling shouldBe CastlingRights.None
    ctx.whiteCastling shouldBe CastlingRights.Both
  test("withCastle: white kingside — king e1→g1, rook h1→f1"):
    val b = board(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook
    )
    val after = b.withCastle(Color.White, CastleSide.Kingside)
    after.pieceAt(sq(File.G, Rank.R1)) shouldBe Some(Piece.WhiteKing)
    after.pieceAt(sq(File.F, Rank.R1)) shouldBe Some(Piece.WhiteRook)
    after.pieceAt(sq(File.E, Rank.R1)) shouldBe None
    after.pieceAt(sq(File.H, Rank.R1)) shouldBe None
  test("withCastle: white queenside — king e1→c1, rook a1→d1"):
    val b = board(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.A, Rank.R1) -> Piece.WhiteRook
    )
    val after = b.withCastle(Color.White, CastleSide.Queenside)
    after.pieceAt(sq(File.C, Rank.R1)) shouldBe Some(Piece.WhiteKing)
    after.pieceAt(sq(File.D, Rank.R1)) shouldBe Some(Piece.WhiteRook)
    after.pieceAt(sq(File.E, Rank.R1)) shouldBe None
    after.pieceAt(sq(File.A, Rank.R1)) shouldBe None
  test("withCastle: black kingside — king e8→g8, rook h8→f8"):
    val b = board(
      sq(File.E, Rank.R8) -> Piece.BlackKing,
      sq(File.H, Rank.R8) -> Piece.BlackRook
    )
    val after = b.withCastle(Color.Black, CastleSide.Kingside)
    after.pieceAt(sq(File.G, Rank.R8)) shouldBe Some(Piece.BlackKing)
    after.pieceAt(sq(File.F, Rank.R8)) shouldBe Some(Piece.BlackRook)
    after.pieceAt(sq(File.E, Rank.R8)) shouldBe None
    after.pieceAt(sq(File.H, Rank.R8)) shouldBe None
  test("withCastle: black queenside — king e8→c8, rook a8→d8"):
    val b = board(
      sq(File.E, Rank.R8) -> Piece.BlackKing,
      sq(File.A, Rank.R8) -> Piece.BlackRook
    )
    val after = b.withCastle(Color.Black, CastleSide.Queenside)
    after.pieceAt(sq(File.C, Rank.R8)) shouldBe Some(Piece.BlackKing)
    after.pieceAt(sq(File.D, Rank.R8)) shouldBe Some(Piece.BlackRook)
    after.pieceAt(sq(File.E, Rank.R8)) shouldBe None
    after.pieceAt(sq(File.A, Rank.R8)) shouldBe None
  test("GameContext single-arg apply defaults to CastlingRights.None for both sides"):
    val ctx = GameContext(Board.initial)
    ctx.whiteCastling shouldBe CastlingRights.None
    ctx.blackCastling shouldBe CastlingRights.None
@@ -0,0 +1,41 @@
 package de.nowchess.chess.logic
 import de.nowchess.api.board.*
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 class GameHistoryTest extends AnyFunSuite with Matchers:
  private def sq(f: File, r: Rank): Square = Square(f, r)
  test("GameHistory starts empty"):
    val history = GameHistory.empty
    history.moves shouldBe empty
  test("GameHistory can add a move"):
    val history = GameHistory.empty.addMove(sq(File.E, Rank.R2), sq(File.E, Rank.R4))
    history.moves should have length 1
    history.moves.head.from shouldBe sq(File.E, Rank.R2)
    history.moves.head.to shouldBe sq(File.E, Rank.R4)
    history.moves.head.castleSide shouldBe None
  test("GameHistory can add multiple moves in order"):
    val h1 = GameHistory.empty
    val h2 = h1.addMove(sq(File.E, Rank.R2), sq(File.E, Rank.R4))
    val h3 = h2.addMove(sq(File.C, Rank.R7), sq(File.C, Rank.R5))
    h3.moves should have length 2
    h3.moves(0).from shouldBe sq(File.E, Rank.R2)
    h3.moves(1).from shouldBe sq(File.C, Rank.R7)
  test("GameHistory can add a castle move"):
    val history = GameHistory.empty.addMove(
      sq(File.E, Rank.R1),
      sq(File.G, Rank.R1),
      Some(CastleSide.Kingside)
    )
    history.moves.head.castleSide shouldBe Some(CastleSide.Kingside)
  test("GameHistory.addMove with two arguments uses None for castleSide default"):
    val history = GameHistory.empty.addMove(sq(File.E, Rank.R2), sq(File.E, Rank.R4))
    history.moves should have length 1
    history.moves.head.castleSide shouldBe None
@@ -2,7 +2,7 @@ package de.nowchess.chess.logic
 import de.nowchess.api.board.*
 import de.nowchess.api.game.CastlingRights
-import de.nowchess.chess.logic.GameContext
+import de.nowchess.chess.logic.GameHistory
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
@@ -12,7 +12,11 @@ class GameRulesTest extends AnyFunSuite with Matchers:
  private def board(entries: (Square, Piece)*): Board = Board(entries.toMap)
  /** Wrap a board in a GameContext with no castling rights — for non-castling tests. */
-  private def ctx(entries: (Square, Piece)*): GameContext = GameContext(Board(entries.toMap))
+  private def testLegalMoves(entries: (Square, Piece)*)(color: Color): Set[(Square, Square)] =
    GameRules.legalMoves(Board(entries.toMap), GameHistory.empty, color)
  private def testGameStatus(entries: (Square, Piece)*)(color: Color): PositionStatus =
    GameRules.gameStatus(Board(entries.toMap), GameHistory.empty, color)
  // ──── isInCheck ──────────────────────────────────────────────────────
@@ -41,20 +45,20 @@ class GameRulesTest extends AnyFunSuite with Matchers:
  test("legalMoves: move that exposes own king to rook is excluded"):
    // White King E1, White Rook E4 (pinned on E-file), Black Rook E8
    // Moving the White Rook off the E-file would expose the king
-    val moves = GameRules.legalMoves(ctx(
+    val moves = testLegalMoves(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.E, Rank.R4) -> Piece.WhiteRook,
      sq(File.E, Rank.R8) -> Piece.BlackRook
-    ), Color.White)
+    )(Color.White)
    moves should not contain (sq(File.E, Rank.R4) -> sq(File.D, Rank.R4))
  test("legalMoves: move that blocks check is included"):
    // White King E1 in check from Black Rook E8; White Rook A5 can interpose on E5
-    val moves = GameRules.legalMoves(ctx(
+    val moves = testLegalMoves(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.A, Rank.R5) -> Piece.WhiteRook,
      sq(File.E, Rank.R8) -> Piece.BlackRook
-    ), Color.White)
+    )(Color.White)
    moves should contain(sq(File.A, Rank.R5) -> sq(File.E, Rank.R5))
  // ──── gameStatus ──────────────────────────────────────────────────────
@@ -62,70 +66,96 @@ class GameRulesTest extends AnyFunSuite with Matchers:
  test("gameStatus: checkmate returns Mated"):
    // White Qh8, Ka6; Black Ka8
    // Qh8 attacks Ka8 along rank 8; all escape squares covered (spec-verified position)
-    GameRules.gameStatus(ctx(
+    testGameStatus(
      sq(File.H, Rank.R8) -> Piece.WhiteQueen,
      sq(File.A, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
-    ), Color.Black) shouldBe PositionStatus.Mated
+    )(Color.Black) shouldBe PositionStatus.Mated
  test("gameStatus: stalemate returns Drawn"):
    // White Qb6, Kc6; Black Ka8
    // Black king has no legal moves and is not in check (spec-verified position)
-    GameRules.gameStatus(ctx(
+    testGameStatus(
      sq(File.B, Rank.R6) -> Piece.WhiteQueen,
      sq(File.C, Rank.R6) -> Piece.WhiteKing,
      sq(File.A, Rank.R8) -> Piece.BlackKing
-    ), Color.Black) shouldBe PositionStatus.Drawn
+    )(Color.Black) shouldBe PositionStatus.Drawn
  test("gameStatus: king in check with legal escape returns InCheck"):
    // White Ra8 attacks Black Ke8 along rank 8; king can escape to d7, e7, f7
-    GameRules.gameStatus(ctx(
+    testGameStatus(
      sq(File.A, Rank.R8) -> Piece.WhiteRook,
      sq(File.E, Rank.R8) -> Piece.BlackKing
-    ), Color.Black) shouldBe PositionStatus.InCheck
+    )(Color.Black) shouldBe PositionStatus.InCheck
  test("gameStatus: normal starting position returns Normal"):
-    GameRules.gameStatus(GameContext(Board.initial), Color.White) shouldBe PositionStatus.Normal
+    GameRules.gameStatus(Board.initial, GameHistory.empty, Color.White) shouldBe PositionStatus.Normal
  test("legalMoves: includes castling destination when available"):
-    val c = GameContext(
+    val b = board(
      board = board(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.H, Rank.R1) -> Piece.WhiteRook,
        sq(File.H, Rank.R8) -> Piece.BlackKing
-      ),
+      )
-      whiteCastling = CastlingRights.Both,
+    GameRules.legalMoves(b, GameHistory.empty, Color.White) should contain(sq(File.E, Rank.R1) -> sq(File.G, Rank.R1))
      blackCastling = CastlingRights.None
    )
    GameRules.legalMoves(c, Color.White) should contain(sq(File.E, Rank.R1) -> sq(File.G, Rank.R1))
  test("legalMoves: excludes castling when king is in check"):
-    val c = GameContext(
+    val b = board(
      board = board(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.H, Rank.R1) -> Piece.WhiteRook,
        sq(File.E, Rank.R8) -> Piece.BlackRook,
        sq(File.A, Rank.R8) -> Piece.BlackKing
-      ),
+      )
-      whiteCastling = CastlingRights.Both,
+    GameRules.legalMoves(b, GameHistory.empty, Color.White) should not contain (sq(File.E, Rank.R1) -> sq(File.G, Rank.R1))
      blackCastling = CastlingRights.None
    )
    GameRules.legalMoves(c, Color.White) should not contain (sq(File.E, Rank.R1) -> sq(File.G, Rank.R1))
  test("gameStatus: returns Normal (not Drawn) when castling is the only legal move"):
    // White King e1, Rook h1 (kingside castling available).
    // Black Rooks d2 and f2 box the king: d1 attacked by d2, e2 attacked by both,
    // f1 attacked by f2. King cannot move to any adjacent square without entering
    // an attacked square or an enemy piece. Only legal move: castle to g1.
-    val c = GameContext(
+    val b = board(
      board = board(
        sq(File.E, Rank.R1) -> Piece.WhiteKing,
        sq(File.H, Rank.R1) -> Piece.WhiteRook,
        sq(File.D, Rank.R2) -> Piece.BlackRook,
        sq(File.F, Rank.R2) -> Piece.BlackRook,
        sq(File.A, Rank.R8) -> Piece.BlackKing
-      ),
+      )
-      whiteCastling = CastlingRights(kingSide = true, queenSide = false),
+    // No history means castling rights are intact
-      blackCastling = CastlingRights.None
+    GameRules.gameStatus(b, GameHistory.empty, Color.White) shouldBe PositionStatus.Normal
  test("CastleSide.withCastle correctly positions pieces for Queenside castling"):
    // Directly test the withCastle extension for Queenside (coverage gap on line 10)
    val b = board(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.A, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )
-    GameRules.gameStatus(c, Color.White) shouldBe PositionStatus.Normal
+    val result = b.withCastle(Color.White, CastleSide.Queenside)
    result.pieceAt(sq(File.C, Rank.R1)) shouldBe Some(Piece.WhiteKing)
    result.pieceAt(sq(File.D, Rank.R1)) shouldBe Some(Piece.WhiteRook)
    result.pieceAt(sq(File.E, Rank.R1)) shouldBe None
    result.pieceAt(sq(File.A, Rank.R1)) shouldBe None
  test("CastleSide.withCastle correctly positions pieces for Black Kingside castling"):
    val b = board(
      sq(File.E, Rank.R8) -> Piece.BlackKing,
      sq(File.H, Rank.R8) -> Piece.BlackRook,
      sq(File.A, Rank.R1) -> Piece.WhiteKing
    )
    val result = b.withCastle(Color.Black, CastleSide.Kingside)
    result.pieceAt(sq(File.G, Rank.R8)) shouldBe Some(Piece.BlackKing)
    result.pieceAt(sq(File.F, Rank.R8)) shouldBe Some(Piece.BlackRook)
    result.pieceAt(sq(File.E, Rank.R8)) shouldBe None
    result.pieceAt(sq(File.H, Rank.R8)) shouldBe None
  test("CastleSide.withCastle correctly positions pieces for Black Queenside castling"):
    val b = board(
      sq(File.E, Rank.R8) -> Piece.BlackKing,
      sq(File.A, Rank.R8) -> Piece.BlackRook,
      sq(File.A, Rank.R1) -> Piece.WhiteKing
    )
    val result = b.withCastle(Color.Black, CastleSide.Queenside)
    result.pieceAt(sq(File.C, Rank.R8)) shouldBe Some(Piece.BlackKing)
    result.pieceAt(sq(File.D, Rank.R8)) shouldBe Some(Piece.BlackRook)
    result.pieceAt(sq(File.E, Rank.R8)) shouldBe None
    result.pieceAt(sq(File.A, Rank.R8)) shouldBe None
@@ -2,7 +2,7 @@ package de.nowchess.chess.logic
 import de.nowchess.api.board.{Board, Color, File, Piece, Rank, Square}
 import de.nowchess.api.game.CastlingRights
-import de.nowchess.chess.logic.{GameContext, CastleSide}
+import de.nowchess.chess.logic.{CastleSide, GameHistory}
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
@@ -211,168 +211,3 @@ class MoveValidatorTest extends AnyFunSuite with Matchers:
      sq(File.E, Rank.R4) -> Piece.BlackRook
    )
    MoveValidator.legalTargets(b, sq(File.D, Rank.R4)) should contain(sq(File.E, Rank.R4))
  // ──── castlingTargets ────────────────────────────────────────────────
  private def ctxWithRights(
    entries: (Square, Piece)*
  )(white: CastlingRights = CastlingRights.Both,
    black: CastlingRights = CastlingRights.Both
  ): GameContext =
    GameContext(Board(entries.toMap), white, black)
  test("castlingTargets: white kingside available when all conditions met"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.castlingTargets(ctx, Color.White) should contain(sq(File.G, Rank.R1))
  test("castlingTargets: white queenside available when all conditions met"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.A, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.castlingTargets(ctx, Color.White) should contain(sq(File.C, Rank.R1))
  test("castlingTargets: black kingside available when all conditions met"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R8) -> Piece.BlackKing,
      sq(File.H, Rank.R8) -> Piece.BlackRook,
      sq(File.H, Rank.R1) -> Piece.WhiteKing
    )()
    MoveValidator.castlingTargets(ctx, Color.Black) should contain(sq(File.G, Rank.R8))
  test("castlingTargets: black queenside available when all conditions met"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R8) -> Piece.BlackKing,
      sq(File.A, Rank.R8) -> Piece.BlackRook,
      sq(File.H, Rank.R1) -> Piece.WhiteKing
    )()
    MoveValidator.castlingTargets(ctx, Color.Black) should contain(sq(File.C, Rank.R8))
  test("castlingTargets: blocked when transit square is occupied"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.F, Rank.R1) -> Piece.WhiteBishop,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.castlingTargets(ctx, Color.White) should not contain sq(File.G, Rank.R1)
  test("castlingTargets: blocked when king is in check"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.E, Rank.R8) -> Piece.BlackRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.castlingTargets(ctx, Color.White) shouldBe empty
  test("castlingTargets: blocked when transit square f1 is attacked"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.F, Rank.R8) -> Piece.BlackRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.castlingTargets(ctx, Color.White) should not contain sq(File.G, Rank.R1)
  test("castlingTargets: blocked when landing square g1 is attacked"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.G, Rank.R8) -> Piece.BlackRook,
      sq(File.A, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.castlingTargets(ctx, Color.White) should not contain sq(File.G, Rank.R1)
  test("castlingTargets: blocked when kingSide right is false"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )(white = CastlingRights(kingSide = false, queenSide = true))
    MoveValidator.castlingTargets(ctx, Color.White) should not contain sq(File.G, Rank.R1)
  test("castlingTargets: blocked when queenSide right is false"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.A, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )(white = CastlingRights(kingSide = true, queenSide = false))
    MoveValidator.castlingTargets(ctx, Color.White) should not contain sq(File.C, Rank.R1)
  test("castlingTargets: blocked when relevant rook is not on home square"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.G, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.castlingTargets(ctx, Color.White) should not contain sq(File.G, Rank.R1)
  // ──── context-aware legalTargets includes castling ────────────────────
  test("legalTargets(ctx, from): king on e1 includes g1 when castling available"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.legalTargets(ctx, sq(File.E, Rank.R1)) should contain(sq(File.G, Rank.R1))
  test("legalTargets(ctx, from): non-king pieces unchanged by context"):
    val ctx = ctxWithRights(
      sq(File.D, Rank.R4) -> Piece.WhiteBishop,
      sq(File.H, Rank.R8) -> Piece.BlackKing,
      sq(File.H, Rank.R1) -> Piece.WhiteKing
    )()
    MoveValidator.legalTargets(ctx, sq(File.D, Rank.R4)) shouldBe
      MoveValidator.legalTargets(ctx.board, sq(File.D, Rank.R4))
  // ──── isCastle / castleSide / isLegal(ctx) ───────────────────────────
  test("isCastle: returns true when king moves two files"):
    val board = Board(Map(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook
    ))
    MoveValidator.isCastle(board, sq(File.E, Rank.R1), sq(File.G, Rank.R1)) shouldBe true
  test("isCastle: returns false when king moves one file"):
    val board = Board(Map(
      sq(File.E, Rank.R1) -> Piece.WhiteKing
    ))
    MoveValidator.isCastle(board, sq(File.E, Rank.R1), sq(File.F, Rank.R1)) shouldBe false
  test("castleSide: returns Kingside when moving to higher file"):
    MoveValidator.castleSide(sq(File.E, Rank.R1), sq(File.G, Rank.R1)) shouldBe CastleSide.Kingside
  test("castleSide: returns Queenside when moving to lower file"):
    MoveValidator.castleSide(sq(File.E, Rank.R1), sq(File.C, Rank.R1)) shouldBe CastleSide.Queenside
  test("isLegal(ctx): returns true for legal castling move"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.isLegal(ctx, sq(File.E, Rank.R1), sq(File.G, Rank.R1)) shouldBe true
  test("isLegal(ctx): returns false for illegal castling move when rights revoked"):
    val ctx = ctxWithRights(
      sq(File.E, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )(white = CastlingRights.None)
    MoveValidator.isLegal(ctx, sq(File.E, Rank.R1), sq(File.G, Rank.R1)) shouldBe false
  test("castlingTargets: returns empty when king not on home square"):
    val ctx = ctxWithRights(
      sq(File.D, Rank.R1) -> Piece.WhiteKing,
      sq(File.H, Rank.R1) -> Piece.WhiteRook,
      sq(File.H, Rank.R8) -> Piece.BlackKing
    )()
    MoveValidator.castlingTargets(ctx, Color.White) shouldBe empty
@@ -0,0 +1,3 @@
 MAJOR=0
 MINOR=2
 PATCH=0
Author	SHA1	Message	Date
Janis	f4c18d22d7	refactor: NCS-8 removed Context and replaced it with History (#6 ) Build & Test (NowChessSystems) TeamCity build finished Details Reviewed-on: #6	2026-03-28 18:08:55 +01:00
TeamCity	4d800e88eb	ci: bump version with Build-18	2026-03-28 12:39:59 +00:00
Janis	2df2fdeeb9	feat: add memory structure documentation and update index (#5 ) Build & Test (NowChessSystems) TeamCity build finished Details Reviewed-on: #5	2026-03-28 13:35:49 +01:00
TeamCity	9190d1e5a0	ci: bump version with v17% Build & Test (NowChessSystems) TeamCity build finished Details	2026-03-27 09:25:13 +00:00
Janis	d675966436	refactor: replace return/var in castlingTargets with functional style (#4 ) Build & Test (NowChessSystems) TeamCity build finished Details Reviewed-on: #4 Co-authored-by: Janis <janis.e.20@gmx.de> Co-committed-by: Janis <janis.e.20@gmx.de>	2026-03-25 08:48:49 +01:00
Janis	b4116e9a82	test: add unit tests for API response, board, color, game state, move, piece, and square (#3 ) Build & Test (NowChessSystems) TeamCity build finished Details Reviewed-on: #3	2026-03-25 08:19:43 +01:00
Janis	11efb1a42d	docs: remove outdated JUnitSuiteLike issue from unresolved.md Build & Test (NowChessSystems) TeamCity build finished Details	2026-03-24 18:12:53 +01:00
lq64	00d326c1ba	feat: implement legal castling (#1 ) Build & Test (NowChessSystems) TeamCity build finished Details ## Summary - Introduces `GameContext` wrapper (board + castling rights) threading through the entire engine pipeline - Extends `MoveValidator` with `castlingTargets`, context-aware `legalTargets`/`isLegal` overloads, and helpers (`isCastle`, `castleSide`) - Updates `GameRules.legalMoves` and `gameStatus` to use `GameContext`, preventing false stalemate when castling is the only legal move - Adds castle detection and atomic execution (`withCastle`) to `GameController.processMove`, plus full rights revocation via source- and destination-square tables ## Test Plan - [ ] 142 tests passing, 100% statement and branch coverage on `modules/core` - [ ] White/Black kingside (e1g1/e8g8) and queenside (e1c1/e8c8) castling moves execute correctly - [ ] All six legality conditions enforced (rights flags, home squares, empty transit, king not in check, transit/landing squares not attacked) - [ ] Rights revoked on king moves, own rook moves, castle moves, and enemy rook captures - [ ] False stalemate correctly prevented when castling is the only escape Co-authored-by: LQ63 <lkhermann@web.de> Co-authored-by: Janis <janis.e.20@gmx.de> Reviewed-on: #1 Reviewed-by: Janis <janis-e@gmx.de> Co-authored-by: Leon Hermann <lq@blackhole.local> Co-committed-by: Leon Hermann <lq@blackhole.local>	2026-03-24 17:55:00 +01:00
Janis	d0289e16f4	fix: update unit test documentation to remove JUnitSuiteLike reference Build & Test (NowChessSystems) TeamCity build finished Details	2026-03-24 12:25:42 +01:00
Janis	7b1f8b1176	fix: update main class path in build configuration and adjust VCS directory mapping Build & Test (NowChessSystems) TeamCity build finished Details	2026-03-24 09:59:13 +01:00