Google's AlphaGo is the best Go player in the world
The AI beats world number one Ke Jie for a second time, sealing a series win.
Google's AI will take on the world's top Go player next month
19-year-old Ke Jie takes on AlphaGo in a best of three match in May.
Google's Deepmind AI will play Go against the world number one
AlphaGo will take on 18-year-old Ke Jie later this year.