Author: Uri Blass
Date: 07:21:09 12/04/03
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On December 04, 2003 at 09:38:36, Robert Hyatt 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 > > >One thing is the q-search. Shallower searches give null-move a better >opportunity to hide a key tactic. At longer depths, this gets pushed >farther out into the tree, where it goes beyond what is "forced" and into >what is "optional" in the real game, most of the time. I remember that when you compared crafty with null move and crafty without null move you found results that suggested that the main benefit of null move is at blitz and not at long time control. This means that null move is not a reason for relatively good results at long time control. Note that I do not think that Crafty is stronger at long time control relatively to other programs and the problem is probably with Fritz5.32 that is weaker at long time control. IMO crafty is one of the top free programs in blitz even at 1+1 on slow computers even when games are without pondering. see http://www.innconx.com/~wildcat/bullet/Ratings.html for Crafty19.03's result. Uri
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