Author: Carmelo Calzerano
Date: 00:59:15 02/15/01
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On February 14, 2001 at 12:37:52, Larry Griffiths wrote: >On February 14, 2001 at 10:11:53, Carmelo Calzerano wrote: > >>On February 14, 2001 at 09:35:58, Larry Griffiths wrote: >> >>>Carmelo, >>> >>>I will dink around with the hash table some more and see if I can find a bug >>>somewhere. >>> >>>Is this Fine 70? >>> >>>[D]8/k7/3p4/p2P1p2/P2P1P2/8/8/K7 w - - >> >>Exactly ;-) >> >>Bye, >>Carmelo > >Ok Carmelo, > >I did find a bug in my hash code and am getting upper_bound cutoffs now. >I owe you one since I was about to give up on the hash table for a while. >I ran the Fine 70 position using a 16meg hash table. My hash tables are >28 bytes in size. > >My program goes 17 plys in 18 seconds without the hash table, >and 19 plys in 6 seconds with the hash table. There is still something to fix then; with HT you should be able to reach at least 25 ply in a few seconds on Fine70. >I noticed that Hardly any of the 16meg hash table was used. I am only using 1 >slot per hash key, and maybe if I add/look at the next 8 slots I can get some >more entries in the hash table and go deeper on plys. I do not know if I will >be able to get 33 plys (impressive). Oh, that's not impressive at all: it's a normal value on Fine70, where all pawns are blocked and only kings can move. Nearly every program which uses HT should be able to do the same (or better). :-) If your can't, maybe you still have some bugs or a really bad key distribution... > I found a bug in my hash table code a few >days ago that might explain why my program was making bad moves with my old hash >table code. > >Thanks so much for your help. You're welcome :) >By the way, what is your chess program name? The name is Leila; it's not yet released, but I plan to freely distribute it after the end of the FIEC (the first italian engine online championship, which is running on FICS). Bye, Carmelo
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