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entirelyuseless comments on AlphaGo versus Lee Sedol - Less Wrong
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I watched the whole of both games played so far. In the first game, Redmond definitely thought that Lee Sedol was winning, and at a point close to the end, he said, "I don't think it's going to be close," and I am fairly confident he meant that Lee Sedol would win by a substantial margin. Likewise, he definitely showed real surprise when the resignation came: even at that point, he expected a human victory.
In the second game, he was more cautious and refused to commit himself, but still seemed to think there were points where Lee Sedol had the advantage. However, in this one he did end up admitting that AlphaGo was winning long before the end came.
In particular, I thought Redmond's handling of the top right corner was striking. He identified it as a potential attack for white several times before white's actual attack, and then afterwards thought that a move was 'big' that AlphaGo ignored; later, on calculation, he realized that it was only (if I recall correctly) a one point move.
It looked to me like an example of the human bias towards the corners and walls, combined with his surprise at some of AlphaGo's moves that made significant changes in the center.