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Tic-Tac-Toe · Classic & Ultimate
Classic Tic-Tac-Toe always ends in a draw with perfect play, so the only way to win is punishing a mistake with a fork, one move creating two winning lines at once. The center is the strongest opening move, since it sits on four lines.
In Ultimate, the cell you play decides which board your opponent must play next. Always think about where you're sending them, not just where you're winning.