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Vandaag is het 21 January 2018

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Tic-tac-toe - logic puzzle

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In Greenwich Village, tic-tac-toe is played in an atypical way. At each turn a player marks as many squares as he wishes provided they are in the same vertical or horizontal row (they need not be adjacent). The winner is the one who marks the last square.

Which player has the advantage, and what strategy should he employ?

Explanation

If the 1st player marks 1 square, the 2nd marks two to form a connected right angle. If instead he marks 2 or 3 squares, the 2nd player marks as many as necessary to complete either an L or a T of 5 squares. In either occasion, the 2nd player wins.