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A top world Go champ lost the last of five games against Google's AlphaGo. But both sides are going home from the match with a lot more to learn.
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"They were neck-and-neck for its entirety, in a game filled with complex fighting," according to a recap. The five-game match will continue through the weekend.
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On Wednesday in South Korea, a Google AI program will take on a top-level player in the ancient game of Go. Here's what you need to know.