Author: Dann Corbit
Date: 18:08:08 10/04/01
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On October 04, 2001 at 14:40:47, John Merlino wrote: >On October 04, 2001 at 13:55:40, Kurt Utzinger wrote: > >>Is there any differnce in playing strength between these three version of >>TheKing. My experience show no difference betwenn 3.12 and 3.13c but so far I >>have not tested 3.12d. >>Regards >>Kurt > >There is no difference in playing strength/style/quality between the 3.12 and >3.12c versions (and the versions in between them, obviously). However, 3.12d >does improve blitz/bullet play under certain circumstances, specifically when >using a very large hash table. > >The King clears its hash table on every move. In my testing with 3.12c on a >PIII-600, it took about 1/3 to 1/2 second to clear a 32MB hash table. This is >not significant during standard play, but losing 1/2 second per move in bullet >is costly. The King 3.12d drastically improved the method in which the hash >table is cleared, so this no longer becomes a problem. However, once again, this >was only a problem if a large hash table was being used in a fast game. I find that really, really puzzling. When analyzing EPD records (for instance) it makes great sense to clear the hash table between moves. When playing a game, you are throwing away a huge amount of computational information. Let's suppose that they pick the move I was pondering... In that case, I should already have computed the answer to quite a large depth. Why solve them over from scratch? Stale entries should get over-written anyway. To throw away the hash table between moves by clearing it is bizarre. Why would anyone do that?
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