Author: Robert Hyatt
Date: 08:29:52 12/04/03
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On December 04, 2003 at 10:21:09, Uri Blass wrote: >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. No, that is backward. What I found was that at blitz, Null-move did worse while at longer time controls it did better. But as depth increased due to faster hardware, the depth at blitz (today) is as good as the depth at long games 8 years ago.. The problem is overlooking fairly shallow tactics by letting the null-move hide a non-capturing threat that the q-search can't find by itself... > >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. I believe it is. For example look at my ICC standard rating, made almost exclusively against computers. Most programs have a blitz rating 200-400 points above their standard rating. Mine isn't. > >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 That may or may not be, but I still feel from watching that it plays better at longer time controls...
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