Minimax Algorithm: The unbeatable AI explores all 255,168 possible game tree variations to calculate mathematically optimal moves with alpha-beta pruning. With optimal play by both sides, Tic-Tac-Toe is a proven theoretical draw.
- Classic 3x3: First player to align 3 symbols horizontally, vertically, or diagonally wins.
- Infinite 3-Piece: Each player is restricted to 3 active markers on the board. When you place your 4th piece, your oldest piece vanishes. Draws are impossible.
- Misère (Inverse): The objective is reversed; the player forced to make 3-in-a-row loses immediately.