Capture the opponent's King by putting it in checkmate — a position from which it cannot escape.
Castling — Move the King 2 squares toward a Rook; the Rook jumps to the other side. Neither piece may have moved previously.
En Passant — If a pawn advances 2 squares past an opposing pawn, that opposing pawn may capture it as if it moved only 1 square.
Promotion — When a Pawn reaches the far rank it promotes to any piece (usually a Queen).
Click a piece to select it — valid moves highlight on the board.
Click a highlighted square to complete the move.
Use Undo / Redo to step through moves, and New Game to restart.