Time and again, he pinched the short strands between his thumb and index fingers, twisting the hair around one and then the other. His opponent, AlphaGo, the machine built by researchers at Google's DeepMind lab, merely played the game. And in the end, as seemed inevitable, it won.
With the win, AlphaGo claimed victory in its three-game match in with Ke Jie in Wuzhen, China, taking a 2-0 lead. The win confirmed that modern AI techniques have already exceeded the talents of even the best humans when playing the ancient game of Go—something that didn't seem possible just a few years ago.
Last year, AlphaGo became the first machine to beat a leading Go professional when it topped the Korean grandmaster Lee Sedol.