Human Go champion who lost to AI says machines cannot be defeated

Lee Se-dol, the Go champion who famously lost to DeepMind's artificial intelligence player AlphaGo, has thrown in the towel for good. He believes that AI is so sophisticated that it's become pointless for him to try and improve -- the algorithms will always be ahead, he told Yonhap News Agency. "With the debut of AI in Go games, I've realized that I'm not at the top even if I become the number one through frantic efforts," he told Yanhap. "Even if I become the number one, there is an entity that cannot be defeated." Lee told Yanhap that his retirement also stems from the fact that his South Korean nationality prevents him from playing in the professional leagues in China or Japan -- he already left the Korean pro leagye over how it handled money.