You don’t exactly need to be a Bobby Fischer to learn how to pay Tic-Tac-Toe. But it wouldn’t hurt when challenging this Lego tic-tac-toe-bot designed and built by Nicky Fitzgerald who was showing it off at Brickworld 2015 in Chicago.

The robot is able to scan the board, place its own pieces, and even figure out if it’s won, if the game’s a tie, or if it’s lost—which apparently rarely happens. Although, as Fitzgerald points out, there’s actually a flaw in its logic that means the robot isn’t 100 percent unbeatable. But you’ll need to bring your Tic-Tac-Toe A-game if you have any hope of winning.

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