Author: Carlos del Cacho
Date: 00:11:08 01/27/01
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On January 26, 2001 at 12:49:15, Severi Salminen wrote: > >>What you say is extremely to the point. I have had similar results with Chess >>Tiger. I can easily increase my NPS and beat everything else on NPS (on PC, I >>mean), but my program would be significantly weaker. >> >>The kind of NPS increase I'm talking about is not by removing chess knowledge. I >>can keep exactly the same evaluation, and by changing several things in the >>search (removing pruning algorithms), I can increase my NPS dramatically. But >>the program will be weaker, even if it is 5x faster in NPS. > >Yes. What made me worry is that when I removed SEE from my engine and played >(just a couple of) games between a version with SEE there were no differences in >tactical play. Could it really be that SEE slows things so much down that the >benefit isn't really significant? I hope this is not the case because I spent _a >lot_ time adding those xray attacks in SEE... > >In Qsearch I stop searching more moves in that node when >eval(node)+move[i].see_score+PAWN_VALUE drops below alpha (they are sorted). >Could this be even more selective? Maybe the PAWN_VALUE could be 0? Have to >try... Maybe it would make things brighter for SEE. (I might remember something >wrong as I don't have access to source code right now.) > >Severi I prune in Quiesce if the above condition meets or SEE value is below zero. That should speed you up a bit. Carlos
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