Players take turns putting 3×3 signs on the free cells of the field (one is always crosses, the other is always zeros). The first one to line up 3 of his pieces vertically, horizontally or on a large diagonal wins. If the players filled in all 9 cells and it turned out that there are no three identical signs in any vertical, horizontal or large diagonal, the game is considered to end in a draw. The first move is made by the player placing crosses.
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