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No matter which of the remaining squares X takes as the second move, there is no way for O to guarantee a win. In fact, there are only 4 specific chains of moves – two pairs of mirror-images – that result in O winning at all:
. . . and X can avoid any of those chains from happening in Move 5 by choosing any of the other 4 squares available. In other words, the only way for X to lose in any of those 4 ways is to do so deliberately.
Basically, once X has taken the center square in the first move, all games end in a win for X or a tie.
Find the word "zero" on the Solution Page to continue on to the next step. Or you can:
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