Go master quits because AI 'cannot be defeated'

A master player of the Chinese strategy game Go has decided to retire, due to the rise of artificial intelligence that "cannot be defeated". Lee Se-dol is the only human to ever beat the AlphaGo software developed by Google's sister company Deepmind. In 2016, he took part in a five-match showdown against AlphaGo, losing four times but beating the computer once. The South Korean said he had decided to retire after realising: "I'm not at the top even if I become the number one." "There is an entity that cannot be defeated," the 18-time world Go champion told South Korea's Yonhap news agency.