Author: Miguel A. Ballicora
Date: 08:49:58 01/26/01
Go up one level in this thread
On January 26, 2001 at 10:55:21, Severi Salminen wrote: > >>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. > >Have you tried limited razoring as described by Ernst Heinz? So, if we are at >D=3 (distance to horizon) and material_balance+RAZOR_MARGIN<=alpha decrease >depth to 2: > >if((material()+MARGIN)<=alpha) > depth=2; > >Heinz suggests values of Queen - Queen+1 to be used as MARGIN. I have some questions: - Where do you perform this test? at the beginning of search? - Does this transform to a futility pruning case when you at at D=1? - In what cases this will be reducing the tree size that null-move did not reduced already? Regards, Miguel > >Severi
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.