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. Its calculations are set Attica fast dialup, Attica, NY dialup fast AtticaAttica dialup, fast New York, Attica fast dialup
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