Author: Ernst A. Heinz
Date: 01:21:26 01/19/98
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On January 18, 1998 at 18:53:15, Bruce Moreland wrote: > >On January 18, 1998 at 10:37:59, Robert Hyatt wrote: > >>It is a form of the extension Bruce described for null-move mate threat >>extension. The idea was to shift the null-move window downward, and >>then >>notice whether the null-move search fails high or low. If it fails low, >>there is some sort of threat in the current position. If it fails high, >>there is no threat. If there is a threat, you extend by 1 ply. >> >>I tried it and found it was not effective at all. It would solve some >>problem positions faster, to be sure, but it did not perform as well in >>regular games. I discarded it two years ago. I believe Bruce Moreland >>also tried it and chucked it... > >No, my idea is a form of Donninger's thing rather than the other way >around. If you want to take this "who discovered what" game a step further, we should attribute all these special cases to Anantharam's more general "threat extension" as described in his Ph.D. thesis. The "Deep Thought" team used fail-low null move scores to detect threats before 1990 ... >The only place I've read about this recently is on the Dark Thought >page. Are you guys still doing this, or am I confused? Yes, I have modified and fine-tuned the original deep-search rules quite a bit in order to make the extension usable. I still like it together with aggressive null move pruning, especially in the endgame. =Ernst=
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