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How many different possible games of tic-tac-toe can be played, move by move?

255,168
possible games
The 'boring' 3x3 grid hides 255,168 distinct possible games — though only a fraction end in anything other than a smug draw.SOURCECombinatorial game theory, standard enumeration
Scale check: 255,168 is roughly Wembley, full, plus a bit.
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