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    Tic-tac-toe

    Illustration

    Illustration

    Statement

    Two players alternately place pieces (typically X's for the first player and O's for the second) on a 3 × 3 board. The first player to get three matching symbols in a row (vertically, horizontally, or diagonally) is the winner. If all squares are occupied but neither player has three symbols in a row, the game is a tie.

    Alternate names

    naughts and crosses | three-in-a-row | ticktacktoe | wick wack woe

    Model

    Model Decision tree

    History

    ≈ 100 BC (≈ 2123 years ago)

    Classes

    fair | finite | futile | perfect information | sequential | two-player | zero-sum

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