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Any brilliant move made in board games like chess or the Chinese game of Go. It refers to the legendary game of Go between an AI, AlphaGo, developed with Google Deep-mind and a legendary South Korean Go player with the title of 9Dan (the highest rank in Go), Lee Sedol.

After losing 3 games in a row to AlphaGo, on move 78 of the fourth game, Lee Sedol made a move that he thought "was the only move that made sense". This move, not only lowered AlphaGo's own prediction of winning from the upper 90% to a measly 45%, but it was the decisive move that won the game for Lee Sedol.

To put into perspective how fucking mental this is, the AI AlphaGo was developed by multiple INCREDIBLY smart computer scientists, TWO entire years in the making and training. This AI has the entire catalogue of previous Go games played and even played against itself to train, cataloguing those games as well. For Lee Sedol, a human, to beat a machine on the tier of AlphaGo is insane to imagine. Even the AI itself was shocked at that move, to the point where it had to teach itself how to resign, with the text "AlphaGo resigns. The result 'W+Resign' was added to the game information." displaying on the screen. THE AI HAD TO LEARN HOW TO RESIGN BECAUSE IT WASN'T FUCKING EXPECTING THAT.

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