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Putnam 2002 A4

  • Session A

In Determinant Tic-Tac-Toe, Player 1 enters a 1 in an empty 3×33 \times 3 matrix. Player 0 counters with a 0 in a vacant position, and play continues in turn until the 3×33 \times 3 matrix is completed with five 1's and four 0's. Player 0 wins if the determinant is 0 and player 1 wins otherwise. Assuming both players pursue optimal strategies, who will win and how?

Curated text Kedlaya Putnam archive. Quoted with source.

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