feat: Implement threefold repetition detection and update game rules

.gitignore

@@ -45,6 +45,3 @@ graphify-out/
 .DS_Store
 /jacoco-reporter/.venv/
 /.claude/settings.local.json
-/modules/bot/python/.venv/
-/modules/bot/python/positions.txt
-/modules/bot/python/training_data.jsonl

docs/idea.md

@@ -1,9 +0,0 @@
-Build a Scala 3 chess engine with these files: CoreTypes.scala, BitboardUtils.scala, MagicBitboards.scala, AttackTables.scala, GameState.scala, MoveGenerator.scala, ZobristHash.scala, AlphaBetaSearch.scala, Evaluation.scala, UciEngine.scala.
-
-Requirements:
-
-Use bitboards and magic bitboards for sliding pieces.
-Implement negamax alpha-beta search with transposition table, quiescence search, and MVV-LVA move ordering.
-Maintain Zobrist hashing for positions.
-Separate concerns: move generation, evaluation, search, and UCI handling.
-Produce a functional, efficient UCI engine in idiomatic Scala 3.

graphify-out/GRAPH_REPORT.md

@@ -1,923 +0,0 @@
-# Graph Report - .  (2026-04-13)
-
-## Corpus Check
-- 132 files · ~24,046,508 words
-- Verdict: corpus is large enough that graph structure adds value.
-
-## Summary
-- 899 nodes · 1116 edges · 146 communities detected
-- Extraction: 100% EXTRACTED · 0% INFERRED · 0% AMBIGUOUS
-- Token cost: 0 input · 0 output
-
-## Community Hubs (Navigation)
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-
-## God Nodes (most connected - your core abstractions)
-1. `DefaultRules` - 35 edges
-2. `GameEngine` - 34 edges
-3. `NNUE` - 23 edges
-4. `EvaluationClassic` - 21 edges
-5. `MoveOrdering` - 21 edges
-6. `ChessBoardView` - 19 edges
-7. `FenParserFastParse` - 17 edges
-8. `FenParserCombinators` - 16 edges
-9. `PgnParser` - 14 edges
-10. `JsonExporter` - 13 edges
-
-## Surprising Connections (you probably didn't know these)
-- None detected - all connections are within the same source files.
-
-## Communities
-
-### Community 0 - "Community 0"
-Cohesion: 0.11
-Nodes (2): CastlingMove, DefaultRules
-
-### Community 1 - "Community 1"
-Cohesion: 0.1
-Nodes (2): GameEngine, PendingPromotion
-
-### Community 2 - "Community 2"
-Cohesion: 0.09
-Nodes (17): ClassGap, _compact_ranges(), _find_scoverage_xml(), format_agent(), format_json(), format_markdown(), format_module_gaps(), main() (+9 more)
-
-### Community 3 - "Community 3"
-Cohesion: 0.13
-Nodes (30): burst_train_interactive(), create_dataset_interactive(), datasets_menu(), delete_dataset_interactive(), export_interactive(), extend_dataset_interactive(), get_data_dir(), get_weights_dir() (+22 more)
-
-### Community 4 - "Community 4"
-Cohesion: 0.14
-Nodes (2): MoveOrdering, OrderingContext
-
-### Community 5 - "Community 5"
-Cohesion: 0.11
-Nodes (21): Dataset, burst_train(), fen_to_features(), find_next_version(), NNUE, NNUEDataset, Find the next version number for model versioning.      Looks for nnue_weights_v, Save training metadata alongside the weights file.      Args:         weights_fi (+13 more)
-
-### Community 6 - "Community 6"
-Cohesion: 0.23
-Nodes (1): NNUE
-
-### Community 7 - "Community 7"
-Cohesion: 0.19
-Nodes (1): EvaluationClassic
-
-### Community 8 - "Community 8"
-Cohesion: 0.15
-Nodes (20): create_dataset(), delete_dataset(), extend_dataset(), get_dataset_labeled_path(), get_datasets_dir(), list_datasets(), load_dataset_metadata(), next_dataset_version() (+12 more)
-
-### Community 9 - "Community 9"
-Cohesion: 0.14
-Nodes (9): format_module(), load_module(), main(), ModuleResult, parse_suite_xml(), run(), SuiteResult, TestCase (+1 more)
-
-### Community 10 - "Community 10"
-Cohesion: 0.18
-Nodes (1): ChessBoardView
-
-### Community 11 - "Community 11"
-Cohesion: 0.14
-Nodes (1): FenParserFastParse
-
-### Community 12 - "Community 12"
-Cohesion: 0.12
-Nodes (7): InvalidFormat, InvalidMove, MoveCommand, MoveResult, QuitCommand, ResetCommand, Successful
-
-### Community 13 - "Community 13"
-Cohesion: 0.12
-Nodes (12): BoardResetEvent, CheckDetectedEvent, CheckmateEvent, DrawClaimedEvent, FiftyMoveRuleAvailableEvent, InvalidMoveEvent, MoveExecutedEvent, MoveRedoneEvent (+4 more)
-
-### Community 14 - "Community 14"
-Cohesion: 0.13
-Nodes (1): FenParserCombinators
-
-### Community 15 - "Community 15"
-Cohesion: 0.26
-Nodes (2): PgnGame, PgnParser
-
-### Community 16 - "Community 16"
-Cohesion: 0.15
-Nodes (3): candidateMoves(), GameEngineIntegrationTest, legalMoves()
-
-### Community 17 - "Community 17"
-Cohesion: 0.14
-Nodes (3): CommandInvokerBranchTest, ConditionalFailCommand, FailingCommand
-
-### Community 18 - "Community 18"
-Cohesion: 0.14
-Nodes (1): GameEnginePromotionTest
-
-### Community 19 - "Community 19"
-Cohesion: 0.25
-Nodes (1): JsonExporter
-
-### Community 20 - "Community 20"
-Cohesion: 0.21
-Nodes (12): download_and_extract_puzzle_db(), extract_puzzle_positions(), extract_tactical_only(), interactive_merge_positions(), load_positions_from_file(), merge_positions(), Load positions from a text file (one FEN per line)., Merge two position sets and write to file. (+4 more)
-
-### Community 21 - "Community 21"
-Cohesion: 0.24
-Nodes (1): AlphaBetaSearch
-
-### Community 22 - "Community 22"
-Cohesion: 0.15
-Nodes (2): EngineTestHelpers, MockObserver
-
-### Community 23 - "Community 23"
-Cohesion: 0.33
-Nodes (1): ZobristHash
-
-### Community 24 - "Community 24"
-Cohesion: 0.18
-Nodes (1): AlphaBetaSearchTest
-
-### Community 25 - "Community 25"
-Cohesion: 0.18
-Nodes (1): ClassicalBotTest
-
-### Community 26 - "Community 26"
-Cohesion: 0.33
-Nodes (2): BookEntry, PolyglotBook
-
-### Community 27 - "Community 27"
-Cohesion: 0.22
-Nodes (1): CommandInvoker
-
-### Community 28 - "Community 28"
-Cohesion: 0.36
-Nodes (1): FenParser
-
-### Community 29 - "Community 29"
-Cohesion: 0.31
-Nodes (1): JsonParser
-
-### Community 30 - "Community 30"
-Cohesion: 0.31
-Nodes (5): applyMove(), Board, removed(), updated(), withMove()
-
-### Community 31 - "Community 31"
-Cohesion: 0.22
-Nodes (1): GameContext
-
-### Community 32 - "Community 32"
-Cohesion: 0.25
-Nodes (6): ApiError, ApiResponse, Failure, PagedResponse, Pagination, Success
-
-### Community 33 - "Community 33"
-Cohesion: 0.39
-Nodes (1): NbaiLoader
-
-### Community 34 - "Community 34"
-Cohesion: 0.22
-Nodes (8): JsonCapturedPieces, JsonCastlingRights, JsonGameRecord, JsonGameState, JsonMetadata, JsonMove, JsonMoveType, JsonPiece
-
-### Community 35 - "Community 35"
-Cohesion: 0.46
-Nodes (1): NbaiWriter
-
-### Community 36 - "Community 36"
-Cohesion: 0.43
-Nodes (1): FenExporter
-
-### Community 37 - "Community 37"
-Cohesion: 0.29
-Nodes (1): CastlingRights
-
-### Community 38 - "Community 38"
-Cohesion: 0.33
-Nodes (6): _evaluate_fen_batch(), label_positions_with_stockfish(), normalize_evaluation(), Normalize centipawn evaluation to a bounded range.      Args:         cp_value:, Worker function to evaluate a batch of FENs with Stockfish threading.      Args:, Read positions and label them with Stockfish evaluations.      Args:         pos
-
-### Community 39 - "Community 39"
-Cohesion: 0.29
-Nodes (1): EvaluationNNUE
-
-### Community 40 - "Community 40"
-Cohesion: 0.29
-Nodes (4): LayerDescriptor, LayerWeights, NbaiMetadata, NbaiModel
-
-### Community 41 - "Community 41"
-Cohesion: 0.53
-Nodes (5): export_to_nbai(), _infer_layers(), Derive layer descriptors from state_dict weight shapes.      Assumes layers name, _read_sidecar(), _write_floats()
-
-### Community 42 - "Community 42"
-Cohesion: 0.53
-Nodes (1): NbaiMigrator
-
-### Community 43 - "Community 43"
-Cohesion: 0.33
-Nodes (2): TranspositionTable, TTEntry
-
-### Community 44 - "Community 44"
-Cohesion: 0.53
-Nodes (1): PolyglotHash
-
-### Community 45 - "Community 45"
-Cohesion: 0.4
-Nodes (2): ChessGUIApp, ChessGUILauncher
-
-### Community 46 - "Community 46"
-Cohesion: 0.5
-Nodes (2): offset(), Square
-
-### Community 47 - "Community 47"
-Cohesion: 0.4
-Nodes (2): PlayerId, PlayerInfo
-
-### Community 48 - "Community 48"
-Cohesion: 0.4
-Nodes (4): play_random_game_and_collect_positions(), Generate games for one worker.      Returns:         list of FENs generated by t, Generate positions using multiprocessing with multiple workers.      Args:, _worker_generate_games()
-
-### Community 49 - "Community 49"
-Cohesion: 0.4
-Nodes (0): 
-
-### Community 50 - "Community 50"
-Cohesion: 0.6
-Nodes (1): NNUEBot
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-### Community 51 - "Community 51"
-Cohesion: 0.4
-Nodes (3): EmptyToken, FenParserSupport, PieceToken
-
-### Community 52 - "Community 52"
-Cohesion: 0.6
-Nodes (1): PgnExporter
-
-### Community 53 - "Community 53"
-Cohesion: 0.5
-Nodes (2): PieceSprites, SquareColors
-
-### Community 54 - "Community 54"
-Cohesion: 0.6
-Nodes (1): TerminalUI
-
-### Community 55 - "Community 55"
-Cohesion: 0.5
-Nodes (1): BotController
-
-### Community 56 - "Community 56"
-Cohesion: 0.67
-Nodes (1): HybridBot
-
-### Community 57 - "Community 57"
-Cohesion: 0.67
-Nodes (1): Parser
-
-### Community 58 - "Community 58"
-Cohesion: 0.5
-Nodes (1): CommandInvokerTest
-
-### Community 59 - "Community 59"
-Cohesion: 0.5
-Nodes (2): EndingMockObserver, GameEngineGameEndingTest
-
-### Community 60 - "Community 60"
-Cohesion: 0.5
-Nodes (2): GameEngineLoadGameTest, MockObserver
-
-### Community 61 - "Community 61"
-Cohesion: 0.5
-Nodes (1): FileSystemGameService
-
-### Community 62 - "Community 62"
-Cohesion: 0.5
-Nodes (1): DefaultRulesStateTransitionsTest
-
-### Community 63 - "Community 63"
-Cohesion: 0.67
-Nodes (1): GUIObserver
-
-### Community 64 - "Community 64"
-Cohesion: 0.67
-Nodes (0): 
-
-### Community 65 - "Community 65"
-Cohesion: 0.67
-Nodes (1): ClassicalBot
-
-### Community 66 - "Community 66"
-Cohesion: 0.67
-Nodes (2): BotParticipant, Human
-
-### Community 67 - "Community 67"
-Cohesion: 0.67
-Nodes (1): MoveCommandTest
-
-### Community 68 - "Community 68"
-Cohesion: 0.67
-Nodes (1): GameEngineNotationTest
-
-### Community 69 - "Community 69"
-Cohesion: 0.67
-Nodes (1): GameEngineWithBotTest
-
-### Community 70 - "Community 70"
-Cohesion: 0.67
-Nodes (1): GameFileServiceSuite
-
-### Community 71 - "Community 71"
-Cohesion: 0.67
-Nodes (1): FenExporterTest
-
-### Community 72 - "Community 72"
-Cohesion: 0.67
-Nodes (1): PgnExporterTest
-
-### Community 73 - "Community 73"
-Cohesion: 0.67
-Nodes (1): Main
-
-### Community 74 - "Community 74"
-Cohesion: 0.67
-Nodes (1): Renderer
-
-### Community 75 - "Community 75"
-Cohesion: 1.0
-Nodes (1): Piece
-
-### Community 76 - "Community 76"
-Cohesion: 1.0
-Nodes (0): 
-
-### Community 77 - "Community 77"
-Cohesion: 1.0
-Nodes (1): Move
-
-### Community 78 - "Community 78"
-Cohesion: 1.0
-Nodes (1): BoardTest
-
-### Community 79 - "Community 79"
-Cohesion: 1.0
-Nodes (1): CastlingRightsTest
-
-### Community 80 - "Community 80"
-Cohesion: 1.0
-Nodes (1): ColorTest
-
-### Community 81 - "Community 81"
-Cohesion: 1.0
-Nodes (1): PieceTest
-
-### Community 82 - "Community 82"
-Cohesion: 1.0
-Nodes (1): PieceTypeTest
-
-### Community 83 - "Community 83"
-Cohesion: 1.0
-Nodes (1): SquareTest
-
-### Community 84 - "Community 84"
-Cohesion: 1.0
-Nodes (1): GameContextTest
-
-### Community 85 - "Community 85"
-Cohesion: 1.0
-Nodes (1): MoveTest
-
-### Community 86 - "Community 86"
-Cohesion: 1.0
-Nodes (1): PlayerInfoTest
-
-### Community 87 - "Community 87"
-Cohesion: 1.0
-Nodes (1): ApiResponseTest
-
-### Community 88 - "Community 88"
-Cohesion: 1.0
-Nodes (1): Config
-
-### Community 89 - "Community 89"
-Cohesion: 1.0
-Nodes (1): BotControllerTest
-
-### Community 90 - "Community 90"
-Cohesion: 1.0
-Nodes (1): BotDifficultyTest
-
-### Community 91 - "Community 91"
-Cohesion: 1.0
-Nodes (1): EvaluationTest
-
-### Community 92 - "Community 92"
-Cohesion: 1.0
-Nodes (1): MoveOrderingTest
-
-### Community 93 - "Community 93"
-Cohesion: 1.0
-Nodes (1): PolyglotBookTest
-
-### Community 94 - "Community 94"
-Cohesion: 1.0
-Nodes (1): PolyglotHashTest
-
-### Community 95 - "Community 95"
-Cohesion: 1.0
-Nodes (1): TranspositionTableTest
-
-### Community 96 - "Community 96"
-Cohesion: 1.0
-Nodes (1): ZobristHashTest
-
-### Community 97 - "Community 97"
-Cohesion: 1.0
-Nodes (1): CommandTest
-
-### Community 98 - "Community 98"
-Cohesion: 1.0
-Nodes (1): ParserTest
-
-### Community 99 - "Community 99"
-Cohesion: 1.0
-Nodes (1): GameEngineOutcomesTest
-
-### Community 100 - "Community 100"
-Cohesion: 1.0
-Nodes (1): GameEngineScenarioTest
-
-### Community 101 - "Community 101"
-Cohesion: 1.0
-Nodes (1): GameEngineSpecialMovesTest
-
-### Community 102 - "Community 102"
-Cohesion: 1.0
-Nodes (1): FenParserCombinatorsTest
-
-### Community 103 - "Community 103"
-Cohesion: 1.0
-Nodes (1): FenParserFastParseTest
-
-### Community 104 - "Community 104"
-Cohesion: 1.0
-Nodes (1): FenParserTest
-
-### Community 105 - "Community 105"
-Cohesion: 1.0
-Nodes (1): JsonExporterBranchCoverageSuite
-
-### Community 106 - "Community 106"
-Cohesion: 1.0
-Nodes (1): JsonExporterSuite
-
-### Community 107 - "Community 107"
-Cohesion: 1.0
-Nodes (1): JsonModelExtraTestSuite
-
-### Community 108 - "Community 108"
-Cohesion: 1.0
-Nodes (1): JsonParserEdgeCasesSuite
-
-### Community 109 - "Community 109"
-Cohesion: 1.0
-Nodes (1): JsonParserErrorHandlingSuite
-
-### Community 110 - "Community 110"
-Cohesion: 1.0
-Nodes (1): JsonParserMoveTypeSuite
-
-### Community 111 - "Community 111"
-Cohesion: 1.0
-Nodes (1): JsonParserSuite
-
-### Community 112 - "Community 112"
-Cohesion: 1.0
-Nodes (1): PgnParserTest
-
-### Community 113 - "Community 113"
-Cohesion: 1.0
-Nodes (1): PgnValidatorTest
-
-### Community 114 - "Community 114"
-Cohesion: 1.0
-Nodes (1): DefaultRulesTest
-
-### Community 115 - "Community 115"
-Cohesion: 1.0
-Nodes (0): 
-
-### Community 116 - "Community 116"
-Cohesion: 1.0
-Nodes (1): RendererAndUnicodeTest
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-### Community 117 - "Community 117"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 118 - "Community 118"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 119 - "Community 119"
-Cohesion: 1.0
-Nodes (1): Strip the package prefix from the full method path.
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-### Community 120 - "Community 120"
-Cohesion: 1.0
-Nodes (1): Lines that are branch points and have at least one uncovered branch statement.
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-### Community 121 - "Community 121"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 122 - "Community 122"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 123 - "Community 123"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 124 - "Community 124"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 125 - "Community 125"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 126 - "Community 126"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 127 - "Community 127"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 128 - "Community 128"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 129 - "Community 129"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 130 - "Community 130"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 131 - "Community 131"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 132 - "Community 132"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 133 - "Community 133"
-Cohesion: 1.0
-Nodes (0): 
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-### Community 134 - "Community 134"
-Cohesion: 1.0
-Nodes (1): Get/create data directory.
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-### Community 135 - "Community 135"
-Cohesion: 1.0
-Nodes (1): Get/create data directory.
-
-### Community 136 - "Community 136"
-Cohesion: 1.0
-Nodes (1): Get/create weights directory.
-
-### Community 137 - "Community 137"
-Cohesion: 1.0
-Nodes (1): List available checkpoint versions.
-
-### Community 138 - "Community 138"
-Cohesion: 1.0
-Nodes (1): Display application header.
-
-### Community 139 - "Community 139"
-Cohesion: 1.0
-Nodes (1): Display available checkpoints in a table.
-
-### Community 140 - "Community 140"
-Cohesion: 1.0
-Nodes (1): Display and handle main menu.
-
-### Community 141 - "Community 141"
-Cohesion: 1.0
-Nodes (1): Interactive training menu.
-
-### Community 142 - "Community 142"
-Cohesion: 1.0
-Nodes (1): Interactive burst training menu.
-
-### Community 143 - "Community 143"
-Cohesion: 1.0
-Nodes (1): Interactive export menu.
-
-### Community 144 - "Community 144"
-Cohesion: 1.0
-Nodes (1): Interactive tactical positions extraction and merge menu.
-
-### Community 145 - "Community 145"
-Cohesion: 1.0
-Nodes (1): Load PyTorch weights and export as binary file.
-
-## Knowledge Gaps
-- **147 isolated node(s):** `Strip the package prefix from the full method path.`, `Lines that are branch points and have at least one uncovered branch statement.`, `[1,2,3,5,7,8,9] → '1-3, 5, 7-9`, `Compact agent format — optimised for low token count.     Emits only actionable`, `Return the first scoverage.xml found inside *module_dir*, or None.` (+142 more)
-  These have ≤1 connection - possible missing edges or undocumented components.
-- **Thin community `Community 75`** (2 nodes): `Piece.scala`, `Piece`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 76`** (2 nodes): `PieceType.scala`, `label()`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 77`** (2 nodes): `Move.scala`, `Move`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 78`** (2 nodes): `BoardTest`, `BoardTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 79`** (2 nodes): `CastlingRightsTest`, `CastlingRightsTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 80`** (2 nodes): `ColorTest`, `ColorTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 81`** (2 nodes): `PieceTest.scala`, `PieceTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 82`** (2 nodes): `PieceTypeTest.scala`, `PieceTypeTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 83`** (2 nodes): `SquareTest.scala`, `SquareTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 84`** (2 nodes): `GameContextTest`, `GameContextTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 85`** (2 nodes): `MoveTest.scala`, `MoveTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 86`** (2 nodes): `PlayerInfoTest.scala`, `PlayerInfoTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 87`** (2 nodes): `ApiResponseTest`, `ApiResponseTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 88`** (2 nodes): `Config`, `Config.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 89`** (2 nodes): `BotControllerTest`, `BotControllerTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 90`** (2 nodes): `BotDifficultyTest`, `BotDifficultyTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 91`** (2 nodes): `EvaluationTest`, `EvaluationTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 92`** (2 nodes): `MoveOrderingTest.scala`, `MoveOrderingTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 93`** (2 nodes): `PolyglotBookTest.scala`, `PolyglotBookTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 94`** (2 nodes): `PolyglotHashTest.scala`, `PolyglotHashTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 95`** (2 nodes): `TranspositionTableTest.scala`, `TranspositionTableTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 96`** (2 nodes): `ZobristHashTest.scala`, `ZobristHashTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 97`** (2 nodes): `CommandTest`, `CommandTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 98`** (2 nodes): `ParserTest.scala`, `ParserTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 99`** (2 nodes): `GameEngineOutcomesTest`, `GameEngineOutcomesTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 100`** (2 nodes): `GameEngineScenarioTest`, `GameEngineScenarioTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 101`** (2 nodes): `GameEngineSpecialMovesTest`, `GameEngineSpecialMovesTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 102`** (2 nodes): `FenParserCombinatorsTest`, `FenParserCombinatorsTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 103`** (2 nodes): `FenParserFastParseTest`, `FenParserFastParseTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 104`** (2 nodes): `FenParserTest`, `FenParserTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 105`** (2 nodes): `JsonExporterBranchCoverageSuite`, `JsonExporterBranchCoverageSuite.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 106`** (2 nodes): `JsonExporterSuite`, `JsonExporterSuite.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 107`** (2 nodes): `JsonModelExtraTestSuite`, `JsonModelExtraTestSuite.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 108`** (2 nodes): `JsonParserEdgeCasesSuite`, `JsonParserEdgeCasesSuite.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 109`** (2 nodes): `JsonParserErrorHandlingSuite`, `JsonParserErrorHandlingSuite.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 110`** (2 nodes): `JsonParserMoveTypeSuite`, `JsonParserMoveTypeSuite.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 111`** (2 nodes): `JsonParserSuite`, `JsonParserSuite.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 112`** (2 nodes): `PgnParserTest.scala`, `PgnParserTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 113`** (2 nodes): `PgnValidatorTest.scala`, `PgnValidatorTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 114`** (2 nodes): `DefaultRulesTest`, `DefaultRulesTest.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 115`** (2 nodes): `PieceUnicode.scala`, `unicode()`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 116`** (2 nodes): `RendererAndUnicodeTest.scala`, `RendererAndUnicodeTest`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 117`** (1 nodes): `build.gradle.kts`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 118`** (1 nodes): `settings.gradle.kts`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 119`** (1 nodes): `Strip the package prefix from the full method path.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 120`** (1 nodes): `Lines that are branch points and have at least one uncovered branch statement.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 121`** (1 nodes): `test_counter.py`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 122`** (1 nodes): `build.gradle.kts`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 123`** (1 nodes): `build.gradle.kts`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 124`** (1 nodes): `start.ps1`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 125`** (1 nodes): `Bot.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 126`** (1 nodes): `BotDifficulty.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 127`** (1 nodes): `build.gradle.kts`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 128`** (1 nodes): `build.gradle.kts`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 129`** (1 nodes): `GameContextExport.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 130`** (1 nodes): `GameContextImport.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 131`** (1 nodes): `build.gradle.kts`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 132`** (1 nodes): `RuleSet.scala`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 133`** (1 nodes): `build.gradle.kts`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 134`** (1 nodes): `Get/create data directory.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 135`** (1 nodes): `Get/create data directory.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 136`** (1 nodes): `Get/create weights directory.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 137`** (1 nodes): `List available checkpoint versions.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 138`** (1 nodes): `Display application header.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 139`** (1 nodes): `Display available checkpoints in a table.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 140`** (1 nodes): `Display and handle main menu.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 141`** (1 nodes): `Interactive training menu.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 142`** (1 nodes): `Interactive burst training menu.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 143`** (1 nodes): `Interactive export menu.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 144`** (1 nodes): `Interactive tactical positions extraction and merge menu.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-- **Thin community `Community 145`** (1 nodes): `Load PyTorch weights and export as binary file.`
-  Too small to be a meaningful cluster - may be noise or needs more connections extracted.
-
-## Suggested Questions
-_Questions this graph is uniquely positioned to answer:_
-
-- **What connects `Strip the package prefix from the full method path.`, `Lines that are branch points and have at least one uncovered branch statement.`, `[1,2,3,5,7,8,9] → '1-3, 5, 7-9` to the rest of the system?**
-  _147 weakly-connected nodes found - possible documentation gaps or missing edges._
-- **Should `Community 0` be split into smaller, more focused modules?**
-  _Cohesion score 0.11 - nodes in this community are weakly interconnected._
-- **Should `Community 1` be split into smaller, more focused modules?**
-  _Cohesion score 0.1 - nodes in this community are weakly interconnected._
-- **Should `Community 2` be split into smaller, more focused modules?**
-  _Cohesion score 0.09 - nodes in this community are weakly interconnected._
-- **Should `Community 3` be split into smaller, more focused modules?**
-  _Cohesion score 0.13 - nodes in this community are weakly interconnected._
-- **Should `Community 4` be split into smaller, more focused modules?**
-  _Cohesion score 0.14 - nodes in this community are weakly interconnected._
-- **Should `Community 5` be split into smaller, more focused modules?**
-  _Cohesion score 0.11 - nodes in this community are weakly interconnected._

modules/api/CHANGELOG.md

@@ -34,3 +34,11 @@
 * NCS-14 implemented insufficient moves rule ([#30](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/30)) ([b0399a4](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/b0399a4e489950083066c9538df9a84dcc7a4613))
 * NCS-21 Write Scripts to automate certain tasks ([#15](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/15)) ([8051871](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/80518719d536a087d339fe02530825dc07f8b388))
 * NCS-25 Add linters to keep quality up ([#27](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/27)) ([fd4e67d](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/fd4e67d4f782a7e955822d90cb909d0a81676fb2))
+##  (2026-04-16)
+
+### Features
+
+* NCS-13 Implement Threefold Repetition ([#31](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/31)) ([767d305](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/767d3051a76c266050b6335774d66e2db2273c16))
+* NCS-14 implemented insufficient moves rule ([#30](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/30)) ([b0399a4](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/b0399a4e489950083066c9538df9a84dcc7a4613))
+* NCS-21 Write Scripts to automate certain tasks ([#15](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/15)) ([8051871](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/80518719d536a087d339fe02530825dc07f8b388))
+* NCS-25 Add linters to keep quality up ([#27](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/27)) ([fd4e67d](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/fd4e67d4f782a7e955822d90cb909d0a81676fb2))

modules/api/versions.env

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

modules/bot/src/test/scala/de/nowchess/bot/AlphaBetaSearchTest.scala

@@ -37,6 +37,7 @@ class AlphaBetaSearchTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = false
       def isInsufficientMaterial(context: GameContext): Boolean            = false
       def isFiftyMoveRule(context: GameContext): Boolean                   = false
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val search = AlphaBetaSearch(stubRules, weights = EvaluationClassic)
@@ -54,6 +55,7 @@ class AlphaBetaSearchTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = false
       def isInsufficientMaterial(context: GameContext): Boolean            = false
       def isFiftyMoveRule(context: GameContext): Boolean                   = false
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val search = AlphaBetaSearch(stubRules, weights = EvaluationClassic)
@@ -101,6 +103,7 @@ class AlphaBetaSearchTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = true
       def isInsufficientMaterial(context: GameContext): Boolean            = false
       def isFiftyMoveRule(context: GameContext): Boolean                   = false
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val search = AlphaBetaSearch(stalematRules, weights = EvaluationClassic)
@@ -117,6 +120,7 @@ class AlphaBetaSearchTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = false
       def isInsufficientMaterial(context: GameContext): Boolean            = true
       def isFiftyMoveRule(context: GameContext): Boolean                   = false
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val search = AlphaBetaSearch(insufficientRules, weights = EvaluationClassic)
@@ -133,6 +137,7 @@ class AlphaBetaSearchTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = false
       def isInsufficientMaterial(context: GameContext): Boolean            = false
       def isFiftyMoveRule(context: GameContext): Boolean                   = true
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val search = AlphaBetaSearch(fiftyMoveRules, weights = EvaluationClassic)
@@ -159,6 +164,7 @@ class AlphaBetaSearchTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = false
       def isInsufficientMaterial(context: GameContext): Boolean            = false
       def isFiftyMoveRule(context: GameContext): Boolean                   = false
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val search = AlphaBetaSearch(rulesWithCapture, weights = EvaluationClassic)
@@ -176,6 +182,7 @@ class AlphaBetaSearchTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = false
       def isInsufficientMaterial(context: GameContext): Boolean            = false
       def isFiftyMoveRule(context: GameContext): Boolean                   = false
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val search = AlphaBetaSearch(rulesQuiet, weights = EvaluationClassic)

modules/bot/src/test/scala/de/nowchess/bot/ClassicalBotTest.scala

@@ -35,6 +35,7 @@ class ClassicalBotTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = false
       def isInsufficientMaterial(context: GameContext): Boolean            = false
       def isFiftyMoveRule(context: GameContext): Boolean                   = false
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val bot  = ClassicalBot(BotDifficulty.Easy, stubRules)
@@ -65,6 +66,7 @@ class ClassicalBotTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = false
       def isInsufficientMaterial(context: GameContext): Boolean            = false
       def isFiftyMoveRule(context: GameContext): Boolean                   = false
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val bot  = ClassicalBot(BotDifficulty.Easy, stubRules)
@@ -87,6 +89,7 @@ class ClassicalBotTest extends AnyFunSuite with Matchers:
       def isStalemate(context: GameContext): Boolean                       = false
       def isInsufficientMaterial(context: GameContext): Boolean            = false
       def isFiftyMoveRule(context: GameContext): Boolean                   = false
+      def isThreefoldRepetition(context: GameContext): Boolean            = false
       def applyMove(context: GameContext)(move: Move): GameContext         = context
 
     val context = GameContext.initial.copy(moves = List(repeatedMove, repeatedMove, repeatedMove))

modules/core/CHANGELOG.md

@@ -260,3 +260,29 @@
 * 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))
+##  (2026-04-16)
+
+### 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-11 50-move rule ([#9](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/9)) ([412ed98](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/412ed986a95703a3b282276540153480ceed229d))
+* NCS-13 Implement Threefold Repetition ([#31](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/31)) ([767d305](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/767d3051a76c266050b6335774d66e2db2273c16))
+* NCS-14 implemented insufficient moves rule ([#30](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/30)) ([b0399a4](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/b0399a4e489950083066c9538df9a84dcc7a4613))
+* 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-17 Implement basic ScalaFX UI ([#14](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/14)) ([3ff8031](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/3ff80318b4f16c59733a46498581a5c27f048287))
+* NCS-21 Write Scripts to automate certain tasks ([#15](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/15)) ([8051871](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/80518719d536a087d339fe02530825dc07f8b388))
+* NCS-25 Add linters to keep quality up ([#27](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/27)) ([fd4e67d](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/fd4e67d4f782a7e955822d90cb909d0a81676fb2))
+* 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/engine/GameEngine.scala

@@ -19,20 +19,17 @@ class GameEngine(
     val ruleSet: RuleSet = DefaultRules,
     val participants: Map[Color, Participant] = Map(Color.White -> Human, Color.Black -> Human),
 ) extends Observable:
+  // Ensure that initialBoard is set correctly for threefold repetition detection
+  private val contextWithInitialBoard = if initialContext.moves.isEmpty && initialContext.board != initialContext.initialBoard then
+    initialContext.copy(initialBoard = initialContext.board)
+  else
+    initialContext
   @SuppressWarnings(Array("DisableSyntax.var"))
-  private var currentContext: GameContext = initialContext
+  private var currentContext: GameContext = contextWithInitialBoard
   private val invoker                     = new CommandInvoker()
 
-  /** Pending promotion: the Move that triggered it (from/to only, moveType filled in later). */
-  private case class PendingPromotion(from: Square, to: Square, contextBefore: GameContext)
-  @SuppressWarnings(Array("DisableSyntax.var"))
-  private var pendingPromotion: Option[PendingPromotion] = None
-
   private implicit val ec: ExecutionContext = ExecutionContext.global
 
-  /** True if a pawn promotion move is pending and needs a piece choice. */
-  def isPendingPromotion: Boolean = synchronized(pendingPromotion.isDefined)
-
   // Synchronized accessors for current state
   def board: Board         = synchronized(currentContext.board)
   def turn: Color          = synchronized(currentContext.turn)
@@ -67,11 +64,15 @@ class GameEngine(
           currentContext = currentContext.withResult(Some(GameResult.Draw(DrawReason.FiftyMoveRule)))
           invoker.clear()
           notifyObservers(DrawEvent(currentContext, DrawReason.FiftyMoveRule))
+        else if ruleSet.isThreefoldRepetition(currentContext) then
+          currentContext = currentContext.withResult(Some(GameResult.Draw(DrawReason.ThreefoldRepetition)))
+          invoker.clear()
+          notifyObservers(DrawEvent(currentContext, DrawReason.ThreefoldRepetition))
         else
           notifyObservers(
             InvalidMoveEvent(
               currentContext,
-              "Draw cannot be claimed: the 50-move rule has not been triggered.",
+              "Draw cannot be claimed: neither the 50-move rule nor threefold repetition has been triggered.",
             ),
           )
 
@@ -87,11 +88,11 @@ class GameEngine(
                 s"Invalid move format '$moveInput'. Use coordinate notation, e.g. e2e4.",
               ),
             )
-          case Some((from, to)) =>
-            handleParsedMove(from, to)
+          case Some((from, to, promotionPiece: Option[PromotionPiece])) =>
+            handleParsedMove(from, to, promotionPiece)
   }
 
-  private def handleParsedMove(from: Square, to: Square): Unit =
+  private def handleParsedMove(from: Square, to: Square, promotionPiece: Option[PromotionPiece]): Unit =
     currentContext.board.pieceAt(from) match
       case None =>
         notifyObservers(InvalidMoveEvent(currentContext, "No piece on that square."))
@@ -104,11 +105,13 @@ class GameEngine(
         candidates match
           case Nil =>
             notifyObservers(InvalidMoveEvent(currentContext, "Illegal move."))
-          case moves if isPromotionMove(piece, to) =>
-            // Multiple moves (one per promotion piece) — ask user to choose
-            val contextBefore = currentContext
-            pendingPromotion = Some(PendingPromotion(from, to, contextBefore))
-            notifyObservers(PromotionRequiredEvent(currentContext, from, to))
+          case _ if isPromotionMove(piece, to) =>
+            if promotionPiece.isEmpty then
+              notifyObservers(InvalidMoveEvent(currentContext, "Promotion piece required: append q, r, b, or n to the move."))
+            else
+              candidates.find(_.moveType == MoveType.Promotion(promotionPiece.get)) match
+                case None       => notifyObservers(InvalidMoveEvent(currentContext, "Error completing promotion: no matching legal move."))
+                case Some(move) => executeMove(move)
           case move :: _ =>
             executeMove(move)
 
@@ -118,21 +121,6 @@ class GameEngine(
       to.rank.ordinal == promoRank
     }
 
-  /** Apply a player's promotion piece choice. Must only be called when isPendingPromotion is true.
-    */
-  def completePromotion(piece: PromotionPiece): Unit = synchronized {
-    pendingPromotion match
-      case None =>
-        notifyObservers(InvalidMoveEvent(currentContext, "No promotion pending."))
-      case Some(pending) =>
-        pendingPromotion = None
-        val move = Move(pending.from, pending.to, MoveType.Promotion(piece))
-        // Verify it's actually legal
-        val legal = ruleSet.legalMoves(currentContext)(pending.from)
-        if legal.contains(move) then executeMove(move)
-        else notifyObservers(InvalidMoveEvent(currentContext, "Error completing promotion."))
-  }
-
   /** Undo the last move. */
   def undo(): Unit = synchronized(performUndo())
 
@@ -154,11 +142,10 @@ class GameEngine(
   private def replayGame(ctx: GameContext): Either[String, Unit] =
     val savedContext = currentContext
     currentContext = GameContext.initial
-    pendingPromotion = None
     invoker.clear()
 
     if ctx.moves.isEmpty then
-      currentContext = ctx
+      currentContext = ctx.copy(initialBoard = ctx.board)
       Right(())
     else replayMoves(ctx.moves, savedContext)
 
@@ -170,14 +157,13 @@ class GameEngine(
     result
 
   private def applyReplayMove(move: Move): Either[String, Unit] =
-    handleParsedMove(move.from, move.to)
-    move.moveType match
-      case MoveType.Promotion(pp) if pendingPromotion.isDefined =>
-        completePromotion(pp)
-        Right(())
-      case MoveType.Promotion(_) =>
-        Left(s"Promotion required for move ${move.from}${move.to}")
-      case _ => Right(())
+    val legal     = ruleSet.legalMoves(currentContext)(move.from)
+    val candidate = move.moveType match
+      case MoveType.Promotion(pp) => legal.find(m => m.to == move.to && m.moveType == MoveType.Promotion(pp))
+      case _                      => legal.find(_.to == move.to)
+    candidate match
+      case None     => Left("Illegal move.")
+      case Some(lm) => executeMove(lm); Right(())
 
   /** Export the current game context using the provided exporter. */
   def exportGame(exporter: GameContextExport): String = synchronized {
@@ -186,7 +172,11 @@ class GameEngine(
 
   /** Load an arbitrary board position, clearing all history and undo/redo state. */
   def loadPosition(newContext: GameContext): Unit = synchronized {
-    currentContext = newContext
+    val contextWithInitialBoard = if newContext.moves.isEmpty then
+      newContext.copy(initialBoard = newContext.board)
+    else
+      newContext
+    currentContext = contextWithInitialBoard
     invoker.clear()
     notifyObservers(BoardResetEvent(currentContext))
   }
@@ -243,10 +233,7 @@ class GameEngine(
     else if ruleSet.isCheck(currentContext) then notifyObservers(CheckDetectedEvent(currentContext))
 
     if currentContext.halfMoveClock >= 100 then notifyObservers(FiftyMoveRuleAvailableEvent(currentContext))
-
-    // Request bot move if it's the opponent bot's turn
-    if ruleSet.isCheckmate(currentContext) || ruleSet.isStalemate(currentContext) then
-      () // Game is over, don't request bot move
+    if ruleSet.isThreefoldRepetition(currentContext) then notifyObservers(ThreefoldRepetitionAvailableEvent(currentContext))
     else requestBotMoveIfNeeded()
 
   private def translateMoveToNotation(move: Move, boardBefore: Board): String =
@@ -336,7 +323,7 @@ class GameEngine(
       if ruleSet.isCheckmate(currentContext) then
         val winner = currentContext.turn.opposite
         notifyObservers(CheckmateEvent(currentContext, winner))
-      else if ruleSet.isStalemate(currentContext) then notifyObservers(StalemateEvent(currentContext))
+      else if ruleSet.isStalemate(currentContext) then notifyObservers(DrawEvent(currentContext, DrawReason.Stalemate))
     }
 
   private def performUndo(): Unit =

modules/core/versions.env

@@ -1,3 +1,3 @@
 MAJOR=0
-MINOR=13
+MINOR=14
 PATCH=0

modules/io/CHANGELOG.md

@@ -47,3 +47,12 @@
 * NCS-29 JSON - Cherry Picked ([#28](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/28)) ([dbcafd2](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/dbcafd286993e0604a6fa286c5543581a149439e))
 * NCS-30 FEN Parser using ParserCombinators ([#21](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/21)) ([b4bc72f](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/b4bc72f7e49f94d6e1bc805c68680e5fe8ef8e36))
 * NCS-31 FastParse FEN ([#22](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/22)) ([7a045d3](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/7a045d31d757bbc5aa6f4bad2664ebe8b8519cac))
+##  (2026-04-16)
+
+### Features
+
+* NCS-14 implemented insufficient moves rule ([#30](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/30)) ([b0399a4](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/b0399a4e489950083066c9538df9a84dcc7a4613))
+* NCS-25 Add linters to keep quality up ([#27](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/27)) ([fd4e67d](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/fd4e67d4f782a7e955822d90cb909d0a81676fb2))
+* NCS-29 JSON - Cherry Picked ([#28](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/28)) ([dbcafd2](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/dbcafd286993e0604a6fa286c5543581a149439e))
+* NCS-30 FEN Parser using ParserCombinators ([#21](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/21)) ([b4bc72f](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/b4bc72f7e49f94d6e1bc805c68680e5fe8ef8e36))
+* NCS-31 FastParse FEN ([#22](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/22)) ([7a045d3](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/7a045d31d757bbc5aa6f4bad2664ebe8b8519cac))

modules/io/versions.env

@@ -1,3 +1,3 @@
 MAJOR=0
-MINOR=7
+MINOR=8
 PATCH=0

modules/rule/CHANGELOG.md

@@ -44,3 +44,14 @@
 ### Bug Fixes
 
 * NCS-32 Queenside Castle doesn't care about pieces in the way ([#23](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/23)) ([fe8e3c0](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/fe8e3c05397f433bfa34d1999e9738c82790adf7))
+##  (2026-04-16)
+
+### Features
+
+* NCS-13 Implement Threefold Repetition ([#31](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/31)) ([767d305](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/767d3051a76c266050b6335774d66e2db2273c16))
+* NCS-14 implemented insufficient moves rule ([#30](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/30)) ([b0399a4](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/b0399a4e489950083066c9538df9a84dcc7a4613))
+* NCS-25 Add linters to keep quality up ([#27](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/27)) ([fd4e67d](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/fd4e67d4f782a7e955822d90cb909d0a81676fb2))
+
+### Bug Fixes
+
+* NCS-32 Queenside Castle doesn't care about pieces in the way ([#23](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/23)) ([fe8e3c0](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/fe8e3c05397f433bfa34d1999e9738c82790adf7))

modules/rule/src/main/scala/de/nowchess/rules/sets/DefaultRules.scala

@@ -458,18 +458,11 @@ object DefaultRules extends RuleSet:
   private def squareColor(sq: Square): Int = (sq.file.ordinal + sq.rank.ordinal) % 2
 
   private def insufficientMaterial(board: Board): Boolean =
-    val nonKings = board.pieces.toList.filter(_._2.pieceType != PieceType.King)
+    val nonKings = board.pieces.toList.filter { case (_, p) => p.pieceType != PieceType.King }
     nonKings match
-      case Nil => true
+      case Nil                                                                                => true
       case List((_, p)) if p.pieceType == PieceType.Bishop || p.pieceType == PieceType.Knight => true
-      case List((sq1, p1), (sq2, p2))
-          if p1.pieceType == PieceType.Bishop && p2.pieceType == PieceType.Bishop
-            && p1.color != p2.color
-            && squareColor(sq1) == squareColor(sq2) =>
-        true
-      case bishops
-          if bishops.forall(_._2.pieceType == PieceType.Bishop)
-            && bishops.map(_._2.color).distinct.size == 1
-            && bishops.map(e => squareColor(e._1)).distinct.size == 1 =>
-        true
+      case bishops if bishops.forall { case (_, p) => p.pieceType == PieceType.Bishop }       =>
+        // All non-king pieces are bishops: draw only if they all share the same square color
+        bishops.map { case (sq, _) => squareColor(sq) }.distinct.sizeIs == 1
       case _ => false

modules/rule/src/test/scala/de/nowchess/rule/DefaultRulesTest.scala

@@ -29,15 +29,10 @@ class DefaultRulesTest extends AnyFunSuite with Matchers:
 
   test("pawn can capture diagonally"):
     // FEN: white pawn e4, black pawn d5
-    val fen     = "8/8/8/3p4/4P3/8/8/8 w - - 0 1"
-    val context = FenParser.parseFen(fen).fold(_ => fail(), identity)
-    val moves   = rules.allLegalMoves(context)
-    val captures = moves.filter { m =>
-      m.from == Square(File.E, Rank.R4) && (m.moveType match
-        case _: MoveType.Normal => true
-        case _                  => false
-      )
-    }
+    val fen      = "8/8/8/3p4/4P3/8/8/8 w - - 0 1"
+    val context  = FenParser.parseFen(fen).fold(_ => fail(), identity)
+    val moves    = rules.allLegalMoves(context)
+    val captures = moves.filter(m => m.from == Square(File.E, Rank.R4) && (m.moveType match { case _: MoveType.Normal => true; case _ => false }))
     captures.exists(m => m.to == Square(File.D, Rank.R5)) shouldBe true
 
   test("pawn cannot move backward"):

modules/rule/versions.env

@@ -1,3 +1,3 @@
 MAJOR=0
-MINOR=2
+MINOR=3
 PATCH=0

modules/ui/CHANGELOG.md

@@ -79,3 +79,15 @@
 * NCS-21 Write Scripts to automate certain tasks ([#15](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/15)) ([8051871](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/80518719d536a087d339fe02530825dc07f8b388))
 * NCS-25 Add linters to keep quality up ([#27](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/27)) ([fd4e67d](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/fd4e67d4f782a7e955822d90cb909d0a81676fb2))
 * NCS-29 JSON - Cherry Picked ([#28](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/28)) ([dbcafd2](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/dbcafd286993e0604a6fa286c5543581a149439e))
+##  (2026-04-16)
+
+### 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-13 Implement Threefold Repetition ([#31](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/31)) ([767d305](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/767d3051a76c266050b6335774d66e2db2273c16))
+* NCS-14 implemented insufficient moves rule ([#30](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/30)) ([b0399a4](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/b0399a4e489950083066c9538df9a84dcc7a4613))
+* 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-17 Implement basic ScalaFX UI ([#14](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/14)) ([3ff8031](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/3ff80318b4f16c59733a46498581a5c27f048287))
+* NCS-21 Write Scripts to automate certain tasks ([#15](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/15)) ([8051871](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/80518719d536a087d339fe02530825dc07f8b388))
+* NCS-25 Add linters to keep quality up ([#27](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/27)) ([fd4e67d](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/fd4e67d4f782a7e955822d90cb909d0a81676fb2))
+* NCS-29 JSON - Cherry Picked ([#28](https://git.janis-eccarius.de/NowChess/NowChessSystems/issues/28)) ([dbcafd2](https://git.janis-eccarius.de/NowChess/NowChessSystems/commit/dbcafd286993e0604a6fa286c5543581a149439e))

modules/ui/build.gradle.kts

@@ -38,11 +38,6 @@ tasks.withType<ScalaCompile> {
     scalaCompileOptions.additionalParameters = listOf("-encoding", "UTF-8")
 }
 
-// Disable scalafix for UI module due to mutable state requirements
-tasks.matching { it.name.startsWith("scalafix") }.configureEach {
-    enabled = false
-}
-
 tasks.named<JavaExec>("run") {
     jvmArgs("-Dfile.encoding=UTF-8", "-Dstdout.encoding=UTF-8", "-Dstderr.encoding=UTF-8")
     standardInput = System.`in`

modules/ui/src/main/scala/de/nowchess/ui/terminal/TerminalUI.scala

@@ -1,7 +1,8 @@
 package de.nowchess.ui.terminal
 
+import java.util.concurrent.atomic.AtomicBoolean
 import scala.io.StdIn
-import de.nowchess.api.move.PromotionPiece
+import de.nowchess.api.game.DrawReason
 import de.nowchess.chess.engine.GameEngine
 import de.nowchess.chess.observer.*
 import de.nowchess.ui.utils.Renderer
@@ -10,8 +11,7 @@ import de.nowchess.ui.utils.Renderer
   * I/O and user interaction in the terminal.
   */
 class TerminalUI(engine: GameEngine) extends Observer:
-  private val running           = new AtomicBoolean(true)
-  private val awaitingPromotion = new AtomicBoolean(false)
+  private val running = new AtomicBoolean(true)
 
   /** Called by GameEngine whenever a game event occurs. */
   override def onGameEvent(event: GameEvent): Unit =
@@ -63,9 +63,6 @@ class TerminalUI(engine: GameEngine) extends Observer:
         print(Renderer.render(e.context.board))
         printPrompt(e.context.turn)
 
-      case _: PromotionRequiredEvent =>
-        println("Promote to: q=Queen, r=Rook, b=Bishop, n=Knight")
-        awaitingPromotion.set(true)
       case _: FiftyMoveRuleAvailableEvent =>
         println("50-move rule is now available — type 'draw' to claim.")
 
@@ -91,24 +88,14 @@ class TerminalUI(engine: GameEngine) extends Observer:
     while running.get() do
       val input = Option(StdIn.readLine()).getOrElse("quit").trim
       synchronized {
-        if awaitingPromotion.get() then
-          input.toLowerCase match
-            case "q" => awaitingPromotion.set(false); engine.completePromotion(PromotionPiece.Queen)
-            case "r" => awaitingPromotion.set(false); engine.completePromotion(PromotionPiece.Rook)
-            case "b" => awaitingPromotion.set(false); engine.completePromotion(PromotionPiece.Bishop)
-            case "n" => awaitingPromotion.set(false); engine.completePromotion(PromotionPiece.Knight)
-            case _ =>
-              println("Invalid choice. Enter q, r, b, or n.")
-              println("Promote to: q=Queen, r=Rook, b=Bishop, n=Knight")
-        else
-          input.toLowerCase match
-            case "quit" | "q" =>
-              running.set(false)
-              println("Game over. Goodbye!")
-            case "" =>
-              printPrompt(engine.turn)
-            case _ =>
-              engine.processUserInput(input)
+        input.toLowerCase match
+          case "quit" | "q" =>
+            running.set(false)
+            println("Game over. Goodbye!")
+          case "" =>
+            printPrompt(engine.turn)
+          case _ =>
+            engine.processUserInput(input)
       }
 
     // Unsubscribe when done

modules/ui/versions.env

@@ -1,3 +1,3 @@
 MAJOR=0
-MINOR=10
+MINOR=11
 PATCH=0