In South Korea on Wednesday, a human champion of the ancient game of "Go" will square off against a computer programmed by Google DeepMind, an AI company owned by the search giant. If the machine can beat the man over a five-day match, then researchers say it will be a milestone for artificial intelligence.Here are the key things to know about the match and what it will mean for the future, both of humanity and our robot overlords.1. A computer won at chess 20 years ago. Go is tougher.IBM grabbed the headlines when its Deep Blue supercomputer bested world champion Gary Kasparov in 1997.But chess is a computer's game. It has strict rules and a limited number of moves each turn. Deep Blue gained the upper hand by crunching a huge volume of possible moves to see which ones would lead to a win.Go is a very different kind of game. Players use stones to fence off territory and capture each other's pieces. It has fewer rules and more choices each turn. In fact, "there are more possible 'Go'
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