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CHANGELOG.md

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Changelog for chessops

v0.14.1

  • Set "type": "module" in package.json.

v0.14.0

  • Change package layout to hybrid cjs/esm with subpath exports.
  • chessops/pgn:
    • Add Node.mainlineNodes().
    • Add node.end().
    • Add extend().

v0.13.0

  • Position.fromSetup() now only checks minimum validity requirements. Remove FromSetupOpts. In particular:
    • As before, bad setup.castlingRights (formerly setup.unmovedRooks) are silently dropped. But note changes to FEN parsing.
    • As before, a bad setup.epSquare is silently dropped.
    • As before, non-standard material is allowed. Use isStandardMaterial() if strict validation is needed.
    • As before, the side to move cannot be giving check.
    • Unlike before, some other positions involving impossibly many checkers are no longer rejected. Use isImpossibleCheck() if strict validation is needed. This is more consistent with the other relaxed choices above, more consistent with Lichess's behavior, and aids tree-shaking.
  • The FEN parser and writer now preserve syntactically valid castling rights even if there is no matching rook or king. Rename unmovedRooks to castlingRights.
  • Add {Material,MaterialSide}.subtract().
  • Add squareFromCoords() to chessops/util.
  • Fix impossible checker validation for Atomic.
  • Fix en passant in some impossible check situations.

v0.12.8

Marked as deprecated on npm. Accidentally included semver-breaking changes.

v0.12.7

  • Implement insufficient material detection for Horde.

v0.12.6

  • Add rookCastlesTo to chessops/util.

v0.12.5

  • Changes to chessops/pgn:
    • Support multiple PGN headers and move text all on the same line.
    • Reject %eval with more than 2 decimals or more than 5 digits.
    • Reject %clk and %emt with more than 3 decimals.

v0.12.4

  • Support eval PGN comment annotations.
  • Fix PGN comment roundtrip by leaving additional spaces in the text.

v0.12.3

  • Fix parsing X-FEN with file notation for black castling rights. Bug discovered using new fuzz-testing suite.
  • Improvements for chessops/pgn:
    • Add defaultGame().
    • Add isChildNode().
    • Add parseComment() and makeComment().
    • Add Box for wrapping immutable context in transformations.

v0.12.2

  • Detect Antichess insufficient material with two knights.

v0.12.1

  • Add more aliases for PGN Variant headers.
  • Fix en passant in Antichess.

v0.12.0

  • Major performance optimizations (e.g. 40% speedup in read-pgn example).
  • Refactor with tree-shaking in mind, for major code size improvements depending on the application. Do not find a method? It might now be a free-standing function.
  • Chess variants directly extend Position instead of Chess.
  • Remove Board.horde() and Board.racingKings().
  • Rename Castles.discardSize() to discardColor().

v0.11.0

  • Introduce chessops/pgn module.
  • Remove chessops/hash module.
  • Fix capturing promoted Crazyhouse pieces.
  • Rename Material.count() and MaterialSide.count() to size(). Add Material.count(role).
  • Add Position.isStandardMaterial().
  • Remove FenOpts.shredder.
  • Track promoted pieces only in Crazyhouse. Remove FenOpts.promoted.
  • Let parseSan() require the original file for pawn captures (good: exd5, bad: d5 if capturing).
  • Target ES2018.

v0.10.5

  • Check that en passant square and checkers are not in conflict.
  • Accept castling flags in FEN in any order, duplicate flags, but no more than two distinct castling rights per side.
  • Accept multiple spaces and underscores as FEN field seperators.

v0.10.4

  • Add .js ending to relative imports (required for ES modules).
  • Introduce FromSetupOpts with ignoreImpossibleCheck.

v0.10.3

  • Fix ThreeCheck not updating remaining checks.

v0.10.2

  • Fix Atomic position validation, where the remaining king is attacked, but the other king has exploded.

v0.10.1

  • Export RacingKings from chessops/variant.
  • Export FenOpts from chessops/fen.

v0.10.0

  • Renamed lichessVariantRules() to lichessRules(), added the inverse function lichessVariant().

v0.9.0

  • Now built as ES module (instead of CommonJS).
  • Made kingCastlesTo() public.

v0.8.1

  • Moved FILES and RANKS from chessops/util to chessops/types, renamed to FILE_NAMES and RANK_NAMES, and added corresponding FileName and RankName string literal types.
  • Also reject positions where a checker is aligned with the en passant square and the king as IllegalSetup.ImpossibleCheck.

v0.7.4

  • Added IllegalSetup.ImpossibleCheck and will now reject setups with too many checkers or aligned sliding checkers. These positions are impossible to reach and Stockfish does not work properly on them.
  • Added equals() to most classes, Board.equalsIgnorePromoted(), and Position.equalsIgnoreMoves().

v0.7.3

  • Fixed parseSan() to properly interpret moves like bxc6 as a pawn capture instead of a bishop move. Lowercase piece letters are no longer accepted, e.g., nf3 must be Nf3.
  • Fixed Position.isLegal() was not accepting the king-moves-two-squares encoding for castling castling moves.

v0.7.2

  • Fixed insufficient material with same-color bishops on both sides.

v0.7.1

  • Fixed parseSan with regard to pawn captures, promotions and some disambiguated moves.

v0.7.0

  • Added parseSan().
  • Added chessgroundMove() compatibility.
  • Added FILES and RANKS constants.
  • Fix spelling of export: transfrom() -> transform().
  • Added {MaterialSide,Material}.{fromBoard,add}().
  • Clamp move counters in FEN export for guaranteed reparsability.
  • Reject promotions not on backrank.
  • Micro-optimizations.

v0.6.0

  • Updated chessgroundDests() for chessground 7.8 compatibility.
  • Added chessgroundDests(pos, {chess960: true}) to generate only Chess960-style castling moves.
  • Renamed scalachessId() to scalachessCharPair().

v0.5.0

  • Removed util.squareDist().
  • Further optimized initialization.
  • Packaged source map.

v0.4.2

  • Performance optimizations, significantly faster initilization.
  • Added SquareSet.withoutFirst().
  • Bumped target to ES2016.

v0.4.1

  • Added lichessVariantRules() compatibility.

v0.4.0

  • Renamed Uci to Move, UciMove to NormalMove, UciDrop to DropMove, and isMove() to isNormal().
  • Renamed uciCharPair() to scalachessId().
  • All ctx parameters are now optional.
  • Added index module with re-exports.

v0.3.6

  • Fixed alternative queenside castling moves (king moved by two squares instead of onto rook). These moves were not correctly classified, normalized or played.

v0.3.5

  • Added compat module for chessground and scalachess interoperability.
  • Added Position.castlingSide().
  • Added Position.normalizeMove().
  • Overloaded parseSquare() for known valid SquareName.

v0.3.4

  • Fixed castling paths in Castles.default() and Chess.default(), leading to illegal king moves.

v0.3.3

  • Fixed Racing Kings move generation with king near goal.
  • Pawn drops in Crazyhouse reset pos.halfmoves.

v0.3.2

  • Fixed SAN of en passant captures.

v0.3.1

  • Optimize SAN disambiguation by adding a fast path for unambiguous moves.

v0.3.0

  • Renamed san.makeVariationSan() to san.makeSanVariation().
  • Fixed SAN disambiguation on b and c file.

v0.2.0

  • Fixed check from a1.
  • Fixed insufficient material with same-color bishops.
  • Fixed Crazyhouse validation and limit pocket size.
  • Fixed Position.fromSetup() entangles position with setup.
  • Made Position.rules() a read-only property Position.rules.
  • Removed SquareSet.subsets().
  • Removed utils.strRepeat().
  • Micro optimizations and misc non-functional tweaks.

v0.1.0

  • First release.