Noughts and crosses

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Definition: a game in which two players alternately put crosses and circles in one of the compartments of a square grid of nine spaces; the object is to get a row of three crosses or three circles before the opponent does

Definition: A two-player game played on a three-by-three grid, in which players take it in turns to place their respective symbol (either a nought or a cross) in a cell of the grid, the objective being to form a row, column or diagonal of three of one's own symbol.