Tic-Tac-Toe's Tie Game

 

 If you know what you are doing, you can't lose at Tic-Tac-Toe. If your opponent knows what they are doing, you can't win at Tic-Tac-Toe. If both players are playing with an optimal strategy, every game will end in a tie. In all other cases, the player that goes first wins 58.7% of the time, the player who moves second wins 28.2% of the time, and 13.1% of the games end in a tie. A tie in Tic-Tac-Toe is called a cat’s game. The term is thought to stem from the idea that a cat cannot catch its own tail just like a player in tic-tac-toe cannot win a game that is already tied.