Author: Mark Young
Date: 15:41:09 06/17/99
Go up one level in this thread
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? > >Eugene
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