Author: Robert Hyatt
Date: 16:51:28 12/07/00
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On December 07, 2000 at 18:39:34, Ernst A. Heinz wrote: >>>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. So does mine. My 'question' was simply a paraphrased version of his. With the same answer. > >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= Absolutely...
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