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January 11, 2026 01:28
Add engine/fixtures.py with predefined chess positions for testing: - Basic positions (starting, empty) - Checkmate scenarios - Special moves (en passant, castling) - Check scenarios - Pawn promotion positions - Stalemate and endgame positions
- Add load_fen() method to parse FEN strings and set board state - Add to_fen() method to export current position as FEN - Add WebSocket callbacks for load_fen, load_fixture, get_fixtures - Track en_passant_target for FEN compatibility - Include turn and FEN in game state JSON - Update en passant logic to work with FEN-loaded positions - Convert indentation from tabs to spaces
- Add loadFen() to load arbitrary FEN positions - Add loadFixture() to load named test fixtures - Add getFixtures() to request fixture list from server - Add reactive refs for turn, currentFen, and fixtures - Update data watcher to handle new state fields
- Display current game state (turn, player, move number) - Show current FEN with copy-to-clipboard button - FEN input field to load arbitrary positions - Dropdown with categorized test fixtures - Reset board button - Dark theme styling to match app
- Add DebugPanel component with toggle visibility - Press D key to show/hide debug panel - Add sidebar layout for debug panel - Ignore keypress when typing in input fields
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Summary
Implements FEN (Forsyth-Edwards Notation) support for loading arbitrary chess positions, along with a debug panel UI for testing. This addresses Issue #77 and provides the testing infrastructure needed for future feature development like check detection (#76).
Changes
Backend (Python)
load_fen()method to parse FEN strings and initialize board stateto_fen()method to export current position as FENload_fen,load_fixture,get_fixturesFrontend (Vue.js)
loadFen(),loadFixture(),getFixtures()methods and reactive state for turn, currentFen, fixturesTest Plan
to_fen()exports correct FEN after making movesCloses #77