Author: Uri Blass
Date: 22:58:53 12/03/03
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On December 03, 2003 at 20:04:19, James T. Walker wrote: >On December 03, 2003 at 19:46:45, Uri Blass wrote: > >>On December 03, 2003 at 19:14:36, James T. Walker wrote: >> >>>I also have a question about Crafty 19.6. Why is it such a poor Blitz player? >>>It seems strong at long time controls but still loses to Fritz 5.32 at Blitz. >>>Is there something in the search that only works at deeper depths than usually >>>reached at blitz? On my XP2400+ Crafty usually hits 9 ply minimum and 10-12 is >>>normal most of the time (G/5min). >>>Jim >> >>Maybe Fritz5.32 is the poor player at longer time control. >>I do not believe in something in the search that only works at deeper depths and >>I believe that it is possible to improve a program at all time controls. >> >>Uri > >Hello Uri, >Why would you believe in something in the search that works at short time >controls but not at longer time controls to explain Fritz 5.32 playing poor at >longer time controls? Then you do not believe in the other way around! I have >seen this type of play on several programs. Rebel also seems to exibit this >phenomena. I seem to remember Ed once told me he had some things in his program >that required deeper searches of maybe 12 ply to work properly. >Jim Programmers may neglect bugs that are relevant only for long time control because of lack of testing and if we consider the fact that Fritz5.32 was developed in the time that the hardware was slower it is not surprising if we find that it has problems at long time control. I think like christophe that it is possible to improve a program at all time controls so I see no reason to do it weaker in blitz and better at longer time control. My experience with old Fritz's is that they have the following problems: 1)They start to have a bad branching factor if I use them for a lot of time 2)They are root processors and the evaluation may be changed significantly after trading queens. This is the reason that I almost never used them in correspondence games. These problems were fixed in later version of Fritz but I believe that Fritz6 was the first program to fix these problems(I did not buy Fritz6 but Deep Fritz6 that was also good enough not to have these problems). Uri
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