a computer looks at chess. It thinks about it in a world of "all possible moves," and it makes a big tree for all of those moves, like this: In this tree, there are 20 possible moves for white. There are 20 * 20 = 400 possible moves for black, depending on what white does. Then there are 400 * 20 = 8,000 for white. Then there are 8,000 * 20 New York City dial up internet, New York City, NY up internet dial New York CityNew York City up internet, dial New York, New York City dial up internet
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