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On the back of an envelope you find an interrupted game of tic-tac-toe (zeroes and crosses). You know that each player was an expert, which means that she never puts herself into a potentially losing position and that she always wins if her opponent gives her the opportunity. There are two Xs and two Os in the diagram, and it is impossible to tell whose move it is. What is the position?
↩︎ Futility Closet
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