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Ultimate Tic-Tac-Toe

By Dennis E. Shasha, December 01, 2001

The dastardly Benjamin Baskerhound has turned over a new leaf, as he matches Xs and Os with criminals for a change.
Dec01: Dr. Ecco's Omniheurist Corner

Figure 1: (a) X moves next. Can X guarantee a win? (b) X moves in the spot X.1. No matter where O moves, X can next move in the center in such a way that X has two ways to move in its last move to get a threesome.



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