white can make three possible moves. From each of those three possible moves, black can make three possible moves. From each of those nine board positions, white can make two possible moves. (In real life, the total number of moves from any position is 20 or so, but that would be hard to draw.) To decide what to do, the computer looks at this tree and works upward from the bottom. Mexico dialup internet access, Mexico, MO internet access dialup MexicoMexico internet access, dialup Missouri, Mexico dialup internet access
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