Author: Bruce Moreland
Date: 16:32:18 02/10/99
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On February 10, 1999 at 19:00:03, Dann Corbit wrote: >On February 10, 1999 at 17:20:34, Dan Homan wrote: >[snip] >>This is a very interesting observation. Maybe it would be right to >>say that null move might be a "waste" of time if the material score >>is not close to beta? Taken a step further... some kind of a "windowed" >>null-move might be a good idea. >> >>I tried this in my program. I changed my null move code so that >>a null move would only be tried *only* if the material score for the side >>to move was greater than (beta-1.5*pawn_value). This reduced my >>searched nodes from 5-10% in most of the positions I have tried so >>far. (I have only tried a handful of WAC positions so far.) >> >>If this pans out, It is a perfectly safe enhancement to >>null-move. The 1.5 pawn window that I tried was arbitrary; >>another value might do better. >What an incredibly creative idea! Not a new idea ;-) bruce >I have thought that it might be interesting to do something like this, but slide >the window as we go forward. In other words, instead of a single value, use a >value that is a function of the plies of the search.
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