Author: Uri Blass
Date: 09:54:38 07/25/02
Go up one level in this thread
On July 24, 2002 at 18:47:21, Miguel A. Ballicora wrote: >On July 24, 2002 at 17:56:04, Nolan Denson wrote: > >>Ok i was trying to read up on extension and ran across this conversation. So >>what I am wondering how much have we improved with todays programs and faster >>computers ... ( This post will be the first time that i see this position) it >>may be a test problem now. >> >>>Posted by Howard Exner on January 09, 1998 at 21:03:51: >> >>[D]r3rk2/ppq2pbQ/2p1b1p1/4p1B1/2P3P1/3P1B2/P3PPK1/1R5R w - - id"Seiriwan - >>>>Sokolov,A" bm Qxg7+; >> >>>I am always interested in the problems that program X finds quickly >>>while program Y struggles. It makes me curious as to what makes them >>>tick. Rebel 8 for example finds WAC 141 rather quickly but has a very >>>hard time finding this above mate in 7. I think it is the quiet move, >>>Bf6 that is the stumbling block for Rebel. >> >>I checked with Rebel9. Rebel9 needs 22:00 and 11 plies. >> >>The "killer" here is not 3.Bf6 but 6.Rh1 >> >>The main variation found: >> >>1.Qxg7 Kxg7 2.Rh7+ Kxh7 3.Bf6 g5 4.Be4+ Bf5 5.Bxf5+ Kg8 6.Rh1 and >>mate on the next move. >> >>I am currently working on a better tactical version. It finds 1.Qxg7 >>in 3:28 on ply 9 but the version in question is 25-30% slower in normal >>positional play. >> >>As always the big question remains if "improved" tactics will result >>in an overall improvement. >> >>For the moment I have baptized this version as Rebel Turtle and I hope >>auto232 will tell me more. >> >>I receive a lot of input from customers. Sometimes they tell you >>something you will not forget your whole life. One of them once said: >> >>"You guys release new versions and every new version only does >>better on points where it was already good" >> >>While I believe this is not the entire truth the man has a point :)) > >Gaviota 0.32 finds it in one minute in a pIII 800mhz. > >Miguel Movei needs depth 11 to see it with pruning based on evaluation and depth 9 to see it without pruning based on evaluation. In both cases it is slower than gaviota and needs some minutes. I need to improve my pruning in order to solve that problem at depth 9 with pruning based on evaluation. Uri
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