Author: Fabien Letouzey
Date: 05:32:05 03/25/04
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On March 25, 2004 at 08:11:08, Sune Fischer wrote: >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. I have read this threat, but what I do is different. There is no extra depth anywhere. My 1-ply thing is because I don't use hash-table values at PV nodes, so Fruit needs a 1-ply search to find it again (and 1-ply search at the PV node son etc ...). At each PV node (usually a single line), all siblings are searched. Fabien.
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