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 up so that it finds the best board positions from each of the possible positions black will take (it takes the maximum): One level up, Bigfoot dial up connection, Bigfoot, TX up connection dial BigfootBigfoot up connection, dial Texas, Bigfoot dial up connection
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