Author: Ernst A. Heinz
Date: 13:01:21 03/02/01
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Hi Severi, >>>>I can save bunches of nodes by not nullmoving on the last ply before >>>>qsearch. So if depthleft == 1 ply then not nullmoving reduces >>>>for me the number of nodes considerably. >>> >>>Interesting idea, I'll give it a try in my engine. >> >>Try it severi! >>I have observed the same thing. I don't do nullmove >>unless depth > 1. I think it makes sense. > >Why does it make sense? I have not yet tried it but I don't understand why >should it be better? Do you have any opinions? I allways want to understand the >features I put into my engine and I don't get this one... Easy -- the relative cost of a depth-reduced null-move search at frontier nodes (with a remaining depth of 1 ply) is just too high. Most normal searches from there also go straight into quiescence mode and the gain of null-move cutoffs does not seem to outweigh the added null-move search effort. =Ernst=
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