Author: Melvin S. Schwartz
Date: 15:49:18 06/17/99
Go up one level in this thread
On June 17, 1999 at 18:41:09, Mark Young wrote: >On June 17, 1999 at 18:33:50, Eugene Nalimov wrote: > >>On June 17, 1999 at 17:58:22, James T. Walker wrote: >> >>>I finished my first 200 games today between Fritz 5.32 and Hiarcs 7.32. The >>>games were played at game/5min. They were run using auto232 operation. Fritz >>>had a K6-2-400 for 100 games and then swapped and took the PII 333 for the >>>second 100 games and vice versa. Fritz used the F5 opening book and Hiarcs used >>>it's own book. Hiarcs had all 3/4 man tablebases plus the 5man tablebases >>>supplied on the CD plus about 10 more 5 man tablebases. (I don't have them all) >>>Fritz won the match 106.5-93.5 indicating about a 22 point superiority at blitz. >>> Of course only 200 games leaves some doubt and I will run another set later but >>>now I want to play 200 games with Hiarcs 7.32 vs Junior 5.0. By the way Hiarcs >>>turned at least one win into a draw because of the tablebases. It was a KPPKP >>>endgame which is supplied with the Hiarcs CD. The problem is there is no KQPKP >>>tablebase so when Hiarcs got the pawn to the 2nd rank (With Black) it did not >>>know how to win the game and got stuck in 3 time rep with Mate in 7 showing in >>>the window?! I had this same problem with another program which prompted a >>>question a few weeks ago. Bob Hyatt says that the only way to use the >>>tablebases is to have them all. I believe it but apparently some programmers do >>>not. At a minimum you need the promotion tablebases if you have the pawn >>>tablebases. >>>Jim Walker >> >>Actually, there is a solution for a missing promotion TBs. It was suggested >>several times in the Crafty mail list, but Bob is unwilling to implement it - my >>guess is that it is going against his sense of aesthetic, because it work not >>100% of the time: >> >>(1) If you have MATE-in-M in the root position, >>(2) No one of the moves lead to MATE-in-(M-1), >> >>Then throw away the moves that lead to TBs draws, loses, or MATE-in-(>=M), turn >>off TB probing for N pieces (where N is # of the pieces at the root), and start >>normal search. There is some analogue between this approach and current approach >>when Crafty tries to exploit opponent's error in a draw position - if it's ahead >>on the material in the draw position, it throw away losing moves and searches >>remainining once with it's normal evaluation function. >> >>Of course Bob will say that the full TBs set can reside at a $120 disk. The >>problem is that not many people (let alone IMs and GMs) will spend $120 for that >>dedicated disk. >> >>BTW, were there games at WCCC9 where TBs affected the result? If I remember it >>correctly, somebody here is doing his/her private match between Hiarcs and >>Fritz, and among the first 10 games 4-man TBs already helped Hiarcs. So, 0.5 >>points from 10. > >I put 512MB of ram in my computer the max for my mother board. The TB generator >says it takes more memory then this to create the KQPKQ TB. Im I out of luck, or >will it still create the TB using disk memory? > Hello Mark, I believe you need about 8 gigs of space available to get the full Nalimov tablebases on your harddrive. For just the 4-man tablebases I believe less than 2 gigs will do it. Mel >> >>Eugene
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