For decades human beings have played games against computers. At first, computers 1______…but then, they started winning. And now, they’ve become so 2______that they're raising doubts about the future of humanity.The latest emblem for existential 3______is Google'sDeepMind project, whichcreated AlphaGo－an A.I.program that’s becomeunbeatable at the most 4______ strategy game on theplanet.While the game of 5_______has 10 to the power of 20possible outcomes, and agame of chess has 10 to thepower of 40 possible outcomes. Go has more than10 to the power of 80 possibleoutcomes.AlphaGo is trained to6______situations itself, by breaking the game down into tiny parts and 7_______all possible moves. Last week, it played the world's best Go player,19-year old Ke Jie, with the help of a human handler. AlphaGo beat him three times and, after doing what it was designed to do, retired from the game.