South Korean professional Go player Lee Sedol attends a press conference after the the Google DeepMind Challenge Match against Google's artificial intelligence program, AlphaGo, in Seoul, South Korea, March 9, 2016. Lee Sedol lost the first match. (Xinhua/Yao Qilin)

South Korean professional Go player Lee Sedol leaves after after the the Google DeepMind Challenge Match against Google's artificial intelligence program, AlphaGo, in Seoul, South Korea, March 9, 2016. Lee Sedol lost the first match. (Xinhua/Gang Ye)

South Korean professional Go player Lee Sedol leaves after after the the Google DeepMind Challenge Match against Google's artificial intelligence program, AlphaGo, in Seoul, South Korea, March 9, 2016. Lee Sedol lost the first match. (Xinhua/Gang Ye)

South Korean professional Go player Lee Sedol (R) shakes hands with Demis Hassabis (L), CEO of Google's London-based AI subsidiary DeepMind, after the Google DeepMind Challenge Match against Google's artificial intelligence program, AlphaGo, in Seoul, South Korea, March 9, 2016. Lee Sedol lost the first match. (Xinhua/Yao Qilin)

South Korean professional Go player Lee Sedol is seen on the screen during the Google DeepMind Challenge Match against Google's artificial intelligence program, AlphaGo, in Seoul, South Korea, March 9, 2016. Lee Sedol lost the first match. (Xinhua/Yao Qilin)

South Korean professional Go player Lee Sedol attends a press conference after the the Google DeepMind Challenge Match against Google's artificial intelligence program, AlphaGo, in Seoul, South Korea, March 9, 2016. Lee Sedol lost the first match. (Xinhua/Yao Qilin)