It took AlphaZero only a few hours of self-learning to become the chess player that shocked the world. The artificial intelligence system AlphaZero had been fed nothing but the rules of the Royal Game when it beat the worlds strongest chess engine in a prolonged match. The selection of ten games published in December 2017 created a worldwide sensation: how was it possible to play in such a brilliant and risky style and not lose a single game against an opponent of superhuman strength? For Game Changer, Matthew Sadler and Natasha Regan investigated more than two thousand previously...