Your chess game is now fully playable! Here's what's included:

- **Full chess rules**: all piece movements, castling (kingside/queenside), en passant, pawn promotion with piece selection UI
- **AI opponent**: minimax with alpha-beta pruning and piece-square tables (tunable depth via Engine Depth slider)
- **Visual feedback**: legal move dots, capture rings, selected piece highlight, last move highlight, check indicator
- **Sound effects**: move, capture, check, and game over sounds using your existing audio files
- **Board coordinates**: rank numbers and file letters displayed on the board
- **Checkmate/stalemate detection** with game over overlay and new game button

**Next Ideas:**
1. **Move History Panel** - Add a scrollable sidebar showing algebraic notation of all moves played
2. **Difficulty Presets** - Add Easy/Medium/Hard buttons that adjust search depth and randomness for varied challenge levels

**Ready to level up your game? Pick one and let's build it!**