Author: Uri Blass
Date: 06:37:14 06/20/03
Go up one level in this thread
On June 20, 2003 at 09:12:57, Ulrich Tuerke wrote: >On June 20, 2003 at 07:34:03, Uri Blass wrote: > >>On June 20, 2003 at 07:29:35, Mike Byrne wrote: >> >>>On June 20, 2003 at 06:15:09, Joachim Rang wrote: >>> >>>>On June 20, 2003 at 05:05:24, Vincent Lejeune wrote: >>>> >>>>> >>>>>I'm running a test with Chesstiger 15 and the Valentin Albillo test set (see >>>>>http://www.talkchess.com/forums/1/message.html?301806) and what a surprise >>>>>Chesstiger have a problem with the first position the well known FINE 70 (Kb1!); >>>>>Crafty, Fritz, Hiarcs have no problem with this position; so why CT ? hashtable >>>>>weakness, pruning weakness or somehting else ? Christophe, an idea ? >>>>> >>>>>>> >>>>>I will publish the result for all positions later Celeron@875, 96 MB hash, 15 >>>>>min/pos >>>> >>>> >>>>DeepSjeng has also Problems. At least in beta stage when I tested the program. >>>>Gian-Carlo replied to my message with the argument, that tuning an engine for >>>>this position makes it weaker in general pawn endgames. I'm sure the views >>>>differ on that position but maybe Theron agrees with Gian-Carlo that this >>>>specific position is an artificial one. >>>> >>>>regards Joachim >>> >>>this position is a question of search not tuning... >> >>I think that GCP talked about tuning the >>extension and pruning rules. >> >>I can imagine that a change in the pruning rules that is productive for other >>positions is not productive for this position. >> >>I do not believe that it is impossible to fix the problem in a productive way >>and I guess that the real reason is that in the same time of fixing the program >>it is possible to do bigger improvements. > >I don't think that solving this position is a matter of pruning or extensions, >since Comet could solve it on a 16 MHz 80386 in a few seconds. It only proves that it is a matter of pruning because Comet had not the same pruning that tiger or sjeng had. I guess that GCP can easily change Sjeng not to have the pruning rules that it has in order to solve it but the problem is that sjeng is going to be weaker only in other pawn endgames. I do not know but I guess that the pruning is about pruning lines that lose a lot of tempos. Uri
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