AlphaGo Zero trains itself to be most powerful Go player in the world

While previous versions of AlphaGo initially trained on thousands of human amateur and professional games to learn how to play Go, AlphaGo Zero skips this step. It learns to play from scratch, simply by playing games against itself, starting from completely random play.

http://www.kurzweilai.net/alphago-zero-trains-itself-to-be-most-powerful-go-player-in-the-world