Author: Robert Hyatt
Date: 08:05:54 01/25/01
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On January 25, 2001 at 09:49:02, Uri Blass wrote: >On January 25, 2001 at 09:34:05, Robert Hyatt wrote: > >>On January 25, 2001 at 08:20:26, David Rasmussen wrote: >> >>>Howdy. >>> >>>Inspired by the thread on extensions, I was wondering whether the idea of >>>negative extensions or reductions could be a good one. >>> >>>I mean, maybe many of the "unsound" pruning methods would be sounder if, instead >>>of just pruning, they just adjusted the resulting depth down. In that way, a >>>line would still be examined, only later. >> >> >>This is what null-move search does, in essence... > >Not exactly. > >I know that some programs cannot solve mate in 2 when it is not a problem of >depth because they are null movers. > >Null move is used also only in cases when there is no threat and the idea of >negative extensions can be used also in different cases so the idea of negative >extensions seems to be more general. > >Uri Null moves aren't used only when there is no threat. IE if I can play a null- move, and you can't hurt me at all, then you don't have any threats. But _I_ might. And it is possible that you have them too, which will generally make the null-move search fail low and be ignored.
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