Chess
Classic chess against the computer with the complete rulebook: castling, en passant, promotion, checkmate, stalemate, the 50-move rule and threefold repetition. Three levels of alpha-beta minimax AI, legal-move hints, undo, and mid-game save to continue later. Win fast and keep more material for a higher score.
Goal: Checkmate the computer's king. Only WON games count on the leaderboard — win quickly and keep more material for a higher score.
- Tap/click one of your pieces to see its legal moves, tap a target square to move
- Pawn on the last rank: pick the promotion piece (Queen/Rook/Bishop/Knight)
- Keyboard: arrow keys move the cursor, Enter/Space selects, U undoes, N starts a new game
- ↶ Undo takes back one move pair, New Game lets you pick White/Black again