Author: Robert Hyatt
Date: 08:31:25 12/04/03
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On December 04, 2003 at 09:49:30, Matthew Hull 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. > >That's bad, right? Yes... > >>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. > >Is this why Hsu opted for full-width, since he had the "power" to take that to >an acceptable depth? And this was perhaps one of his "advantages" over a >null-mover? > >Matt That was his explanation. Null-move is not without risk. Just look at all the null-move killer positions posted here and around the world. non-null-move programs don't have that problem. Of course, null-move has its advantages as well, so you have to believe that the pros outweigh the cons. And the longer the time control, the more true this seems to be. Play a null-mover at only 5 plies and it will make ugly errors.
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