Author: Bas Hamstra
Date: 06:13:13 10/18/00
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On October 18, 2000 at 08:06:23, David Rasmussen wrote: >I was wondering about a potential "bug" or at least "unwanted feature" of the >way hashing and extensions affect eachother in, say, Crafty. > >The problem is basically this: > >In Crafty, whenever depth is used for other purposes than searching (that is >hashing and nullmove), the extension factor isn't included. That means that a >search that essentially asked for a depth=5 + extensions=3 == 8 ply search, will >return with success from the hashprobe if the draft is just 6 or 7. Shouldn't >the depth parameter ALWAYS be used with relevant extensions for the search to be >(at least more) theoretically correct ? > >Am I making sense? I think I know what you mean. I store always as draft the depth that is actually searched below this node. So if I normally would search 5 ply, but there is 1 extension, this node is searched at 6 ply. So store draft=6. Now when the search asked for a 6 ply depth, and there was no extension, the hashrecord with draft=6 could theoretically be returned. I believe Crafty does something different, that I too don't understand. Regards, Bas Hamstra.
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