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This generalization of Tic-Tac-Toe is called m,n,k-game. (the goal is to get k in a row on a (m,n) board). Some known bounds: (source wikipedia) (5,5,4) is a draw. (6,6,5) is a draw. (7,7,5) and (8,8,5) are draws. (15,15,5) is a win. (9,6,6) and (7,7,6) are both draws via pairings. When the goal is 9 or larger (k>=9) the second player can force a ...

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