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X and O is a 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 is the winner.

Game

Players

• X.
• O.

Turn

• When the game starts the turn is X.
• When the turn is X then X can mark and O can not mark.
• When the turn is O then O can mark and X can not mark.
• Given the turn is X when X marks then the turn is O.
• Given the turn is O when O marks then the turn is X.

Winner

• When the game starts the winner is empty.
• Given the turn marked a space when three of its marks in a horizontal, vertical, or diagonal row then the winner is the turn.
• When the winner is not empty then the game stops.

Grid

• Width is 3.
• Height is 3.

Space

• When the game starts the space is empty.
• Given a space is empty when the turn marks then the space is turn.
• Given a space is not empty then the turn can not mark the space.