docs(50-move-rule): 50 move docs

Removed 50 move docs from this repo

.claude/agents/test-writer.md

@@ -20,5 +20,4 @@ When invoked BEFORE scala-implementer (no implementation exists yet):
 
 When invoked AFTER scala-implementer (implementation exists):
   Run python3 jacoco-reporter/jacoco_coverage_gaps.py modules/{service-name}/build/reports/jacoco/test/jacocoTestReport.xml --output agent
-  Use the jacoco-coverage-gaps skill — close coverage gaps revealed by the report.
   To regenerate the report run the tests first.

modules/api/CHANGELOG.md

@@ -3,3 +3,4 @@
 ##  (2026-03-28)
 ##  (2026-03-29)
 ##  (2026-03-31)
+##  (2026-04-01)

modules/api/versions.env

@@ -1,3 +1,3 @@
 MAJOR=0
 MINOR=0
-PATCH=5
+PATCH=6

modules/core/CHANGELOG.md

@@ -79,3 +79,23 @@
 * 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))
+##  (2026-04-01)
+
+### 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))
+* NCS-10 Implement Pawn Promotion ([#12](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/12)) ([13bfc16](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/13bfc16cfe25db78ec607db523ca6d993c13430c))
+* NCS-16 Core Separation via Patterns ([#10](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/10)) ([1361dfc](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/1361dfc89553b146864fb8ff3526cf12cf3f293a))
+* NCS-6 Implementing FEN & PGN ([#7](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/7)) ([f28e69d](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/f28e69dc181416aa2f221fdc4b45c2cda5efbf07))
+* NCS-9 En passant implementation ([#8](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/8)) ([919beb3](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/919beb3b4bfa8caf2f90976a415fe9b19b7e9747))
+* 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))
+* update move validation to check for king safety ([#13](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/13)) ([e5e20c5](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/e5e20c566e368b12ca1dc59680c34e9112bf6762))

modules/core/src/main/scala/de/nowchess/chess/controller/GameController.scala

@@ -76,7 +76,7 @@ object GameController:
       case None                              => MoveResult.NoPiece
       case Some(piece) if piece.color != turn => MoveResult.WrongColor
       case Some(_) =>
-        if !MoveValidator.isLegal(board, history, from, to) then MoveResult.IllegalMove
+        if !GameRules.legalMoves(board, history, turn).contains(from -> to) then MoveResult.IllegalMove
         else if MoveValidator.isPromotionMove(board, from, to) then
           MoveResult.PromotionRequired(from, to, board, history, board.pieceAt(to), turn)
         else applyNormalMove(board, history, turn, from, to)

modules/core/src/test/scala/de/nowchess/chess/controller/GameControllerTest.scala

@@ -43,6 +43,30 @@ class GameControllerTest extends AnyFunSuite with Matchers:
     // White pawn at E2 cannot jump three squares to E5
     processMove(Board.initial, GameHistory.empty, Color.White, "e2e5") shouldBe MoveResult.IllegalMove
 
+  test("processMove: move that leaves own king in check returns IllegalMove"):
+    // White King E1 is in check from Black Rook E8. Moving the D2 pawn is
+    // geometrically legal but does not resolve the check — must be rejected.
+    val b = Board(Map(
+      sq(File.E, Rank.R1) -> Piece.WhiteKing,
+      sq(File.D, Rank.R2) -> Piece.WhitePawn,
+      sq(File.E, Rank.R8) -> Piece.BlackRook,
+      sq(File.A, Rank.R8) -> Piece.BlackKing
+    ))
+    processMove(b, GameHistory.empty, Color.White, "d2d4") shouldBe MoveResult.IllegalMove
+
+  test("processMove: move that resolves check is allowed"):
+    // White King E1 is in check from Black Rook E8 along the E-file.
+    // White Rook A5 interposes at E5 — resolves the check, no new check on Black King A8.
+    val b = Board(Map(
+      sq(File.E, Rank.R1) -> Piece.WhiteKing,
+      sq(File.A, Rank.R5) -> Piece.WhiteRook,
+      sq(File.E, Rank.R8) -> Piece.BlackRook,
+      sq(File.A, Rank.R8) -> Piece.BlackKing
+    ))
+    processMove(b, GameHistory.empty, Color.White, "a5e5") match
+      case _: MoveResult.Moved => succeed
+      case other => fail(s"Expected Moved, got $other")
+
   test("processMove: legal pawn move returns Moved with updated board and flipped turn"):
     processMove(Board.initial, GameHistory.empty, Color.White, "e2e4") match
       case MoveResult.Moved(newBoard, newHistory, captured, newTurn) =>

modules/core/versions.env

@@ -1,3 +1,3 @@
 MAJOR=0
-MINOR=5
+MINOR=6
 PATCH=0

modules/ui/CHANGELOG.md

@@ -0,0 +1,6 @@
+##  (2026-04-01)
+
+### Features
+
+* NCS-10 Implement Pawn Promotion ([#12](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/12)) ([13bfc16](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/13bfc16cfe25db78ec607db523ca6d993c13430c))
+* NCS-16 Core Separation via Patterns ([#10](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/10)) ([1361dfc](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/1361dfc89553b146864fb8ff3526cf12cf3f293a))

modules/ui/versions.env

@@ -0,0 +1,3 @@
+MAJOR=0
+MINOR=1
+PATCH=0