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Changelog.md

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Changelog

1.0.0 - 2026-03-03

Engine

  • Rewrote createGame() to remove unreachable code after return
  • Fixed makeMove() to use matched legal move flags instead of raw input (castling and en passant were silently ignored when called without flags)
  • Fixed makeMove() missing return value on success
  • Added undoMove() with full state restoration (board, castling rights, en passant target, half-move clock, full-move number)
  • Fixed en passant target not being cleared on non-pawn moves
  • Fixed isCheckmate() and isStalemate() not receiving en passant and castling context
  • Fixed initializeBoard() pawn rows using Array.fill() with shared object references
  • Added rook existence check to castling generation
  • Added king-in-check guard before allowing castling
  • Added half-move clock and full-move number tracking
  • Added insufficient material draw detection in status computation
  • Added 50-move rule draw detection
  • Implemented Standard Algebraic Notation generation with captures, disambiguation, check, and checkmate suffixes
  • Implemented FEN export, import, and validation
  • Added findKing() utility to board module
  • Populated utils.ts with coordinate conversion helpers
  • Removed unused posEq from move generator
  • Changed GameStatus value from "normal" to "playing" for clarity

UI

  • Fixed board orientation (white at bottom, black at top)
  • Added file and rank labels (a-h, 1-8)
  • Replaced flat legal move highlighting with dot indicators for empty squares and ring indicators for capturable pieces
  • Added smooth background transitions on squares
  • Improved check indication color
  • Added move history panel with numbered SAN move pairs
  • Added FEN display with copy button
  • Added FEN input field with validation and load support
  • Removed moveToSAN from UI layer (chess logic moved to engine)
  • Added piece shadows for depth
  • Promotion modal now shows piece symbols instead of text labels, with overlay backdrop
  • Added global base styles in index.html
  • Changed "Reset" button label to "New Game"

Code Quality

  • Installed @types/react and @types/react-dom
  • Removed duplicate vite.config.mjs
  • Rewrote useGame hook with proper deep cloning and useCallback memoization
  • Fixed useGame referencing undefined undoMove import
  • Made all engine modules framework-agnostic with zero React imports
  • Removed all unused imports and type parameters
  • Removed row and col props from Square component (unused internally)
  • Strict TypeScript throughout with no any casts

Tests

  • Rewrote all tests with correct board setups
  • Fixed en passant test (was testing wrong rank configuration)
  • Added tests for: castling execution, en passant capture, undo of castling/en passant/promotion, FEN round-trip, FEN loading, FEN rejection, SAN recording, insufficient material

Documentation

  • Rewrote README with accurate feature list and architecture description
  • Rewrote Changelog with structured technical entries

0.1.0 - 2026-03-03

  • Initial implementation: board rendering, move generation, basic rules, React UI
  • Castling, en passant, promotion, check/checkmate/stalemate detection
  • Board interaction: click-to-select, move highlighting, promotion modal
  • Move history panel, undo and reset
  • Unit tests for core rules