Author: Uri Blass
Date: 07:06:15 11/08/00
Go up one level in this thread
On November 08, 2000 at 07:50:49, Thorsten Czub wrote: <snipped> >if i would live in a dream world, not knowing what is going >on, how do i manage to >find out about which programs are good and which are not good >before the ssdf-list has tested them emperical ? > >sounds like a paradoxon. I think that you cannot find it by big evaluations because big evaluations can help programs to lose by wrong sacrifices. It happened to Gandalf4.32 that lost against shredder2 on slower hardware because of speculative sacrifices. Here is the relevant position again: [D]3rr1k1/1bq1b1p1/pp1ppnnp/2p5/2P1P3/1PNBBN1P/P2Q1PP1/R2R2K1 w - - 0 1 Gandalf sacrificed by Bxh6 and lost the game(I am not sure if Bxh6 is wrong but gandalf played weak after this move). The line of the game was 20.Bxh6 gxh6 21.Qxh6 Nf8 22.Ng5? Gambittiger shows the same main line but it can after more than 12 minutes on my pentiumIII450(192Mbytes hash) to avoid Bxh6 when Gandalf cannot like Bxh6 even after 14 hours. I will test later if it can avoid Ng5 I think that big evaluations can be productive but you should do tests to see that it is not big in the wrong places. A good test suite about evaluation of program should have cases when speculative sacrifices are wrong and not only cases when speculative sacrifices are right. <snipped> >right. >bob is on the wrong track. >he searchers for help. but i think there is no help in that fight anymore. >gambit tiger is there. you have to live with it. >you cannot ignore gambit tiger anymore. >and not the way it gets its results. >thats part of it. 1)Gambittiger wins in part of the games because it is good in the endgame. Gambittiger is also better than Crafty in tactics. The fact that Gambittiger wins against Crafty is not a proof that it is because of better king safety evaluation because when you are better in tactics playing for king attack can help you to score better. The real test is against tiger13 that is not weaker than Gambit in tactics. I guess that gambit is going to beat also tiger13 in the future because christophe only started the work about gambittiger and he is going to improve it. 2)Crafty lost in your games against gmabittiger but Crafty could not use more than one processor. My guess is that Bob is going to care about tiger when Crafty is going to lose against Gambit on ICC. I guess that he cares more about Deep Fritz because Deep Fritz scores better against crafty on ICC. Uri
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