Author: Bruce Moreland
Date: 15:53:15 01/18/98
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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. A difference though is that I still use a zero-width window and I'm not shifting anything anywhere. Sometimes I get values out of the alpha-beta window, and I count on this here, otherwise the thing wouldn't work at all. I tried it a long time ago and didn't like it. 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? bruce
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