Author: Sune Fischer
Date: 05:11:08 03/25/04
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On March 25, 2004 at 07:47:02, Fabien Letouzey wrote: >> >>So was I. You have only solved the problem along the PV. It _still_ exists >>along non-PV moves just as I explained... >> >>this has nothing to do with aspiration issues... > >Yes of course it does not fix all the problems, I should have stated >it. However I think I gain some "stability" (and a complete PV as a >side effect) at the cost of a 1-ply search (sometimes more) all along >the PV. For some reason, I did not consider turning hashing off >everywhere in the tree :) > >The tradeoff in my design is that null-window searches can do what >they want (forward prune, be inconsistent, etc ...), and the pv-node >search will try to accomodate with that. > >Fabien. I recall having read about something similar, namely extending the PV to make sure the line is sound. I believe the conclusion was that it didn't work so well, that the PV was no more important than the refutations and there was no a priori reason to be extending it. The result might be a change in playing style, with this extension the engine appears "paranoid" always double checking itself. It leads to safe play but it might miss some tactics along the refutation lines because they as a result gets searched less deep. -S.
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