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A new signaturetable techniqueis described together with an improved book learning procedurewhichis thought to be much superior to the linear polynomialmethod described earlier. Full use is made of the so called "alpha-beta" pruning and several forms of forward pruning to restrict the spread of the movetree and to permitthe program to look ahead to a much greater depth than it otherwisecould do. While still unable to outplay checker masters, the program's playingability has been greatly improved.

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