Tic-tac-toe

Tic-tac-toe

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Tic-tac-toe/wick wack woe/noughts and crosses, is a pencil-and-paper game for two players, X and O, who take turns marking the spaces in a 3×3 grid. The X player usually goes first. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game.

Despite its apparent simplicity, Tic-tac-toe requires detailed analysis to determine even some elementary combinatory facts, the most interesting of which are the number of possible games and the number of possible positions. A position is merely a state of the board, while a game usually refers to the way a terminal position is obtained.

Captures d'écrans Tic-tac-toe
View bigger - Tic-tac-toe for Android screenshot
View bigger - Tic-tac-toe for Android screenshot
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