Author: Omid David Tabibi
Date: 14:07:07 08/01/03
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On August 01, 2003 at 16:49:10, Gerd Isenberg wrote: >On August 01, 2003 at 16:01:51, Joshua Lee wrote: > >>Would someone please explain pawn hash and how much of the whole hash tables it >>is when you set them to lets say 256MB? > >Hi Joshua, > >as Rick already mentioned, pawn hash tables are for pure pawn related eval >stuff. It requires a separate pawn hashkey, incrementally updated if pawn >formation changes, similar to main hash table. > >The size depends on the size of your entries and the number of entries of >course. The number of entries should be much more less than in main hash table, >64K entries are quite enough IMHO. But the entry size may be bigger than in main >hash, depending on what you store (some aggregated eval score or several >bitbooards with some important properties). > >If i think about my eval with a lot of pawn-king or piece interactions... >May be i throw out pawn hash table in future IsiChess. A lot of pawn patterns >like, isolated, backward, double, triple, candidates, passers, outside passers, >duos, rams etc. may be generated on the fly with bitboards and stored a while. > >On the other hand, if you hash pawn eval, you may do a lot of really expensive >things with pawns - >the hit rate is about 99%. That's about the hit rate I get in closed positions, but for example searching from the start position, I only get a hit rate of of slightly over 90%. > >Regards, >Gerd > >> >>Thankyou
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