Author: Ernst A. Heinz
Date: 06:49:34 11/02/98
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On November 02, 1998 at 08:24:08, Robert Hyatt wrote: > >On November 02, 1998 at 02:49:14, Koen van Dijken wrote: > >>mr Hyatt, >> >>I was comparing the speed in nps of my own program against that of Crafty. I >>have the sources for 14.2 and 15.20. I noticed that in Search there is a >>difference in node counting between 14.2 and 15.20. In 14.2 you do not count >>illegal moves, in 15.20 you do. Is there a reson for this? >> >>15.20 >> } else tree->nodes_searched++; >> UnMakeMove(tree,ply,tree->current_move[ply],wtm); >> >>Is this maybe the way nodecounting is done in other programs as well, for >better >>comparising? >> >>Koen van Dijken. > > >That was the main idea. However it turned out to have no effect... because now >I increment nodes_searched at the top of search, and I *never* get there unless >the position is "legal"... so for search() it doesn't matter. In quiesce, I >do count illegal positions... but the point is counting "work" really... and if >I do a MakeMove() and so forth, I "searched" that node whether it was legal or >not. We do *not* count illegal positions for our NPS numbers. IMO counting illegal positions is not a good idea because they require so much less work than legal nodes. Actually, there is not much to do beside make/unmake move at illegal nodes. =Ernst=
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