Author: Robert Hyatt
Date: 11:41:24 10/24/02
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On October 24, 2002 at 14:04:07, Fernando Villegas wrote: >I wonder if every or some commercial prorams has the same "panic mode" DB had. >Sometimes I gues they does have one. At leats after some move that does make >them happy, I have observed that time allotment change, depth of the search >deepens and so on. Chris, Ed? >Fernndo I think that since Bert and I first published the "using time wisely" paper in the JICCA many years ago, _everybody_ has been doing that in some form or another. For years, we watched people bouncing up and down in their chairs hoping their program would see that the move it was about to play was the wrong move because the score had dropped way down. The only question was could their machine find a better move before running out of time. We decided to stop doing that and added the "fail-low time extension" idea and then reported on it at the next ACM event. The next year everybody was doing something that seemed very logical to me a couple of years earlier... The only question is how you define "panic mode". Deep Blue had something more refined that just "the score dropped" but I never followed Hsu's explanation since it was very brief and unclear (to me). Something like "if the size of the tree can't be expressed in a canonical form, then we consider the tree to be unstable." His idea worked, even if I didn't understand how it worked. But it would use more time in positions where it had not yet failed low, which was the important point.
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