Tic-Tac-Toe

Play X against an O computer that explains every move.

Checking API...

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Preparing the board.

Move explanation

Play a move to see the computer's reasoning.

No moves yet.

You are X. Click an empty square. The computer responds as O.

The computer checks for an immediate win, then a required block, then evaluates every legal move using perfect play.

The original one-file version is preserved at legacy.php.