English: Cheat sheet listing all possible non-trivial mistakes in the tic-tac-toe game. Here, a non-trivial mistake is a move that allows your opponent to force a win in more than one move. This cheat sheet can help you to prevent making a mistake, to choose those moves that allow your opponent to make mistakes, and to recognize mistakes by your opponent. Trivial mistakes (moves that allow your opponent to win in the next move) are not listed, because these are easily recognized without a cheat sheet.
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