Author: Dieter Buerssner
Date: 10:46:43 04/15/05
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On April 14, 2005 at 22:51:49, Dann Corbit wrote: [Expriments show that TBs don't help] >It appears that the cost of a lookup is about the same as the cost of >calculation. This could be the cause, or at least one reason. I guess, that the main reason is more complicated. Robert Allgeuer reported, that he actually did not see cases of (bigger) slowdowns. I think, that another reason is, that the search tree changed in a way, that makes search less efficient (in some cases). But I have not really understood it yet. For example, I have seen cases, where with TBs the score hangs at 0.0 for a while, and without TBs it showed (say) a score of 0.1 that is increasing. The non TB search was on the right direction. All those 0.0 scores (from TBs) might hurt move ordering at later stages. It is clear, that probing only at the root must help, at least against an opponent with TBs. When the opponent has no TBs with little effort, it must help, too. For example with a Crafty like "cheat mode" (?), where only moves with the game theoretical score are tried. Regards, Dieter Regards, Dieter
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