Calculations are client-side. Moves take 15 to 30 seconds, longer for high-entropy boards.

Click the speaker. You will receive computer move alerts. If your browser shows a popup, wait.

House rules. En passant is allowed. King may castle after a prior check. Pawn always promotes to Queen. Draw by threefold repetition, fifty-move rule. Opening book knowledge can be turned-off.

The game allows no undo. Once you move, it’s final. Engage with precision, and enjoy :)