The next morning, David Silver slipped into the control room, just so he could revisit the decisions AlphaGo made in choosing Move 37. In the midst of each game, drawing on its training with tens of millions of human moves, AlphaGo calculated the probability that a human would make a particular play. With Move 37, the probability was one in ten thousand. AlphaGo knew this wasn’t a move a professional Go player would ever make. Yet it made the move anyway, drawing on the millions of games it had played with itself—games in which no human was involved. It had come to realize that although no
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