Master’s best game not good enough for AlphaGo
Print Edition
A computer program beat China’s top Go player for the second time yesterday.
Ke Jie lost despite playing what Google’s AlphaGo indicated was the best game any opponent had played against it, said Demis Hassabis, founder of the company that developed the program.
AlphaGo defeated Ke, a 19-year-old prodigy, in their first game on Tuesday in Wuzhen, a watertown west of Shanghai. They play a final game tomorrow.
AlphaGo has defeated European and South Korean champions, surprising players expecting it to be years before computers could master the game.
AlphaGo “thought that Ke Jie played perfectly” for the first 50 moves, Hassabis said yesterday.
“For the first roughly 100 moves, it is the closest game we have ever seen anyone play against the master version of AlphaGo,” he said.
Ke said the computer made unexpected moves after playing more methodically on Tuesday.
“From the perspective of human beings, it stretched a little bit and I was surprised at some points,” he said.
“I also thought that I was very close to winning the match in the middle,” Ke said. “I could feel my heart thumping. But maybe because I was too excited, I did some wrong or stupid moves. I guess that’s the biggest weak point of human beings.”
Go players place white or black stones on a grid with 361 intersections, trying to capture territory and each other’s pieces by surrounding them. The game is considered difficult for machines because the near-infinite number of possible positions requires intuition and flexibility.
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