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Re:Lee Sedol defeats AlphaGo in masterful comeback – Game 4 ... by Mithaldu on Sunday March 13, 2016 @05:09PM (#11279364)
Earlier, with detailed discussion on why the "masterful" bit is a bit exaggerated: https://news.ycombinator.com/item?id=11276798

In short: The strategy is not "win the game", but "exploit the machine to cause a bug".

Re:Lee Sedol defeats AlphaGo in masterful comeback – Game 4 ... by AI_Overlord on Sunday March 13, 2016 @05:49PM (#11279512)
Seems unfair to say that he only won because there was a bug. You could equally say that the player lost because a bug in his brain caused him to not see the proper move. Stress will cause a lot of players to make mistakes, which in my mind it's a bug of our brain.