Author: Ernst A. Heinz
Date: 15:39:34 12/07/00
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>>But the effects you describe, Bob, are rather due to the >>hash-table usage than to the pruning. They might also >>occur if you just change your move ordering. > >Correct. However, the question he asked was could futility pruning affect >the score at the root. The answer is yes, because of the transposition table >problem... No, the question asked ran as follows: "Can sombody explain me why futility pruning tends to give slight positional differences?" My answer to this still stands. However, you have pointed out a fine detail about the idiosyncracies of transposition tables -- namely, *their* usage *does* indeed tend to result in differences whenever you change *anything* in the sequence and number of nodes visited! Specifically, the use of transposition tables actually also tends to lead to differences between alpha-beta and normal minimax searches. =Ernst=
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