bishop 1.1.1

Bishop is a chess logic package with flexible variant support

1.1.1

• Custom drop move generation is now possible with Variant.handOptions.dropBuilder.
• Added variant definitions: Mini Xiangqi (Xiangqi.mini()), Manchu (Xiangqi.manchu()), Hoppel-Poppel (MiscVariants.hoppelPoppel()), Shako (LargeVariants.shako()), Dobutsu (Dobutsu.dobutsu()).
• Fixed a bug in serialisation of pieces with limited promo options.
• Experimental (incomplete) Shogi and support.
• Variant.withCampMate() - helper method to add the campmate end condition to a variant.
• Variant.withPieces() and Variant.withPiecesRemoved() helpers.
• The play example can now load JSON variants.

1.1.0

• JSON Serialisation support - Variant.fromJson() and Variant.toJson().

1.0.0

• A powerful new action system with an accessible API for creating custom game logic. Trigger actions on certain events and execute them if their conditions are met.
  • Support for Atomic Chess.
  • Xiangqi flying generals rule implemented.
• Overhaul regarding how promotion works:
  • Promotion move generation is now handled by builder functions, and can be defined in variants with PromotionOptions. This allows for more versatile promotion move generation, including cases like limiting the number of pieces of a certain type, conditional promotions, non-rank based promotion areas, etc.
  • PieceType definitions now take PiecePromoOptions object that encapsulates its promotion behaviour. It is possible to define pieces that only have specific promotion options here (e.g. like Shogi).
  • Grand chess is now working as expected.
• The state of the board is now stored in BishopState, instead of a single list in Game being modified. This improves code readability and also results in small performance improvements in most cases.
• More descriptive game results. Use Game.result to see the exact way the game ended (null if it's still ongoing). Old getters like Game.checkmate still exist but result is preferred.
• Variant.gameEndConditions now takes a GameEndConditionsSet, allowing for asymmetric end conditions.
• GameEndConditions now allows disabling stalemate (resulting in a loss for the stalemated player), and elimination losses (when all pieces are removed).
  • Support for Horde Chess.
• Variant.hands boolean option replaced with HandOptions, allowing for variants where hands are enabled but captured pieces aren't added to them (pieces can now be added through actions - see Variant.spawn() example).
• PieceType and MoveDefinition are now immutable, and are normalised with copyWith methods instead of mutation.
• Fixed a bug which would invalidate castling moves in Chess960 if the target square was the rook square, and that was attacked (thanks @malaschitz).

0.6.4

• Fixed gates being output the wrong way round in FEN strings for fixed gating variants.

0.6.3

• Added variant: King of the Hill.
• Support for win regions.
• Added examples/play.dart - interactive CLI application for playing a game.
• Convenience methods on Game - moveHistory, moveHistoryAlgebraic and moveHistorySan.

0.6.2

• Switched to standard symbols for Xiangqi, i.e. Elephants are 'B' and Horses are 'N'.

0.6.1

• Board regions and region effects - these allow custom behaviour to be defined for pieces that are in specific areas of the board, and the ability to restrict piece types to regions.
• Fixed a bug in gating move generation on non standard sized boards.
• Xiangqi support: variant and piece definitions, regions and effects.
• Fixed a bug where the SAN format for pawn captures might be wrong (thanks @malaschitz).
• Fixed Chess960 castling moves not being generated for kings on g1 (thanks @malaschitz).
• Fixed Crazyhouse bugs: pawns being droppable on the first rank, and promoted pieces not being captured as pawns (thanks @malaschitz).
• Fixed a extremely rare case where a rook on the file of another uncastled rook of the same colour would affect the castling rights of that other rook (thanks @malaschitz).

0.6.0

• Support for hopper pieces, such as the Grasshopper and Xiangqi Cannon, and Betza modifiers 'p' and 'g'.
• Fixed a bug with capture only sliding moves not generating correctly.

0.5.2

• Fixed a bug in premove generation where quiet moves to opponent occupied squares weren't generating (e.g. pawn step forward onto opponent's piece).
• Added some extension functions for List<Move>, for filtering moves more fluently.

0.5.1

• Some convenience methods on Variant: pieceSymbols and commonPieceSymbols.
• Built in CastlingOptions are now static const.
• CastlingOptions.copyWith() and MaterialConditions.copyWith();

0.5.0

• Variant is now an immutable data type, which is converted to BuiltVariant when it's used in Game.
• fenBuilder parameter in Game constructor, overrides variant.startPosBuilder.
• Game.makeMoveString() and Game.makeMultipleMoves().
• variantFromString() utility function.

0.4.0

• Improved structure and formatting of codebase.
• There are some minor breaking changes, mostly related to CONSTANT_NAMES being changed to camelCase, and otherwise being more logically grouped. Some factory constructors were also changed to static constants, e.g. MaterialConditions.standard() is now MaterialConditions.standard.

0.3.3

• Fixed flex gating not generating no-drop moves
• Added support for variants that end after a number of checks (e.g. Three-Check)

0.3.2

• Support for fixed gating (e.g. gating in Muskteeer chess)
• Support for directional modifiers for oblique pieces in Betza parser (e.g. fN is now possible)

0.3.1

• Insufficient material draws
• Improved FEN validation
• Fixed a Zobrist hashing bug (on captures)
• Various minor improvements

0.3.0

• Gating drops and the Seirawan Chess variant
• Virgin file tracking
• Lots more documentation
• Allow a custom seed to be specified (for Zobrist hashing)
• Fixed SAN for castling with check

0.2.10

• Another small variant (mini - 6x6)
• buildRandomPosition() for generating arbitrary random positions, see Variant.miniRandom for an example
• Fixed a bug in which drop moves were not being legalised
• Fixed SAN disambiguators for pawns
• Various minor improvements

0.2.9

• Fixed FEN validation for small boards
• Added some documentation

0.2.8

• Fixed another 960 castling bug (370 / BNRKRBNQ)

0.2.7

• Fixed a castling bug in some 960 positions (e.g. 938 / RKRNBBQN)

0.2.6

• Support loading incomplete FEN strings
• Game.validateFen() function
• CastlingOptions.useRookAsTarget: formats algebraic moves correctly for Chess960

0.2.5

• Premove generation
• Game.loadFen() function

0.2.4

• Fixed engine not wanting to checkmate you
• Micro variant

0.2.3

• Basic engine
• Fixed CastlingOptions assertion

0.2.2

• Mini variant
• Independent side castling (e.g. only queenside for Minichess)
• Piece values

0.2.1

• Added Game.boardSymbols(), for use with the squares package

0.2.0

• Renamed package to Bishop
• Piece drops & hands (Crazyhouse support)

0.1.1

• Zobrist hashing & repetition draws

0.1.0

• Hello Bishop