In big win for AI, Google computer AlphaGo defeats legendary Go player

After three and a half hours, top-ranked Go player Lee Se-dol had to tap out. After some overextensions early in the game, he had played an optimal sequence, but his opponent – a computer running a Google-developed program called AlphaGo – had made several moves so unexpected they took him aback.“I was very surprised,” he told reporters after the game. “I never thought I would lose, [but] I didn’t know that AlphaGo would play the game in such a perfect manner.” There’s hope for the humans yet: the match, played on March 9 in Seoul, South Korea, is only the first of a five-game series. Mr. Lee thinks he has a good chance of beating the computer in subsequent games by changing up his opening moves. But this first victory shows…


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