An n-in-a-row Game

The usual $n$-in-a-row game is a positional game in which two player alternately claim points in $\bb{Z}^2$ with the winner being the first player to claim $n$ consecutive points in a line. We consider a variant of the game, suggested by Croft, where the number of points claimed increases by 1 each turn, and so on turn $t$ a player claims $t$ points. Croft asked how long it takes to win this game. We show that, perhaps surprisingly, the time needed to win this game is $(1-o(1))n$.

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