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Tic-tac-toe (American English), noughts and crosses (Commonwealth English), or Xs and Os (Canadian or Irish English) is a paper-and-pencil game for two players who take turns marking the spaces in a three-by-three grid with X or O. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row first is the ...
Tic-Tac-Toe is a game where the player places a letter (either an X or an O) on part of the board, which consists of a 3×3 grid. The aim of the game is to complete 3 squares in a row, either vertically, horizontally, or diagonally.
Diagram showing optimal strategy for tic-tac-toe.With perfect play, and from any initial move, both players can always force a draw. In combinatorial game theory, a two-player deterministic perfect information turn-based game is a first-player-win if with perfect play the first player to move can always force a win.
A complete game of Notakto, a misère variant of the game. Tic-tac-toe is an instance of an m,n,k-game, where two players alternate taking turns on an m×n board until one of them gets k in a row. [1] Harary's generalized tic-tac-toe is an even broader generalization. The game can also be generalized as a n d game. [2]
A strategy-stealing argument can be used on the example of the game of tic-tac-toe, for a board and winning rows of any size. [2] [3] Suppose that the second player (P2) is using a strategy S which guarantees a win. The first player (P1) places an X in an arbitrary position. P2 responds by placing an O according to S.
Consider the game of tic-tac-toe played in a d-dimensional cube of length n. By the Hales–Jewett theorem, when d is large enough (as a function of n), every 2-coloring of the cube-cells contains a monochromatic geometric line. Therefore, by the above corollary, First always has a winning strategy.
Tic-tac-toe is the game where n equals 3 and d equals 2 (3, 2). [4] Qubic is the (4, 3) game. [4] The (n > 0, 0) or (1, 1) games are trivially won by the first player as there is only one space (n 0 = 1 and 1 1 = 1). A game with d = 1 and n > 1 cannot be won if both players are playing well as an opponent's piece will block the one-dimensional ...