Author: Uri Blass
Date: 10:27:32 02/10/01
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On February 10, 2001 at 12:43:05, leonid wrote: >On February 10, 2001 at 12:00:30, Uri Blass wrote: > >>On February 10, 2001 at 11:08:17, leonid wrote: >><snipped? >>>What is the "ss=10" ? >> >>ss is the selectivity search parameter of chessmaster. >> >>I know from experience that chessmaster is usually faster in solving problems if >>I give it bigger selectivity. >> >>The default value is 6 and the maximal value is 10. > >Probably it is the maximum number of moves to see in each ply. When mine solved >this position this variable was at 6. > >Leonid. It is not. I believe that it is about null move pruning. Chessmaster shows two depthes. The first number is usually small(1 in the first iterations). The second number is bigger when the difference between them is not more than the selectivity. I guess that Chessmaster does not use the null move pruning in the first plies but it is using null move pruning everywhere in the tree later. I believe that when chessmaster shows depth 1/4 it means that it looks at everything at depth 1 in the tree. It also looks at everything at depth 4 except move that it prunes because of null move pruning and it also does a lot of extensions so it can practically see mate in 10 at depth 1/4. I know from experience that chessmaster waste a lot of time on stupid lines if I give it a low selectivity because it does not prune lines with no threat. Uri
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