AlphaGo: Computer defeat 'painful' for Chinese Go prodigy

The world's number one Go player has spoken of his "pain" at losing to a Google-owned computer algorithm that has now defeated several masters in the ancient Chinese board game.

Nineteen-year-old prodigy Ke Jie was reduced to tears at the end of the final game in the Chinese city of Wuzhen.

The algorithm's developer says the computer will no longer be used to play humans.