Game Go is a strategy game for two players, it is the most complex game in the world due to its vast number of variations in individual games. Lee Sedol is a guru of this game. But last year he lost the match with computer! It was for the first time, when computer won such a complex game! Computer never gets tired, angry or hungry, it feels no pain. Fortunately, it still needs electricity. Can computers replace humans? Not yet. It is a big challenge for computer scientists to find a balance and safety for users.