Author: Martin Giepmans
Date: 10:35:00 12/27/01
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On December 27, 2001 at 12:46:39, Christophe Theron wrote: >On December 27, 2001 at 12:07:35, Martin Giepmans wrote: > >>On December 27, 2001 at 08:43:35, Uri Blass wrote: >> >>>On December 27, 2001 at 08:15:08, K. Burcham wrote: >>> >>>> >>>>I guess that you missed the following post about spidderchess that needed less >>>>than 1 second >>>> >>>>http://www.icdchess.com/forums/1/message.shtml?203638 >>>> >>>>Uri >>>> >>>> >>>>Uri, did you believe this? >>> >>>Yes >>> >>>>it has to be either for the wrong reason, or the program was run after >>>>position learning. we know for the necessary calculations, this position >>>>cannot be determined in one second. >>> >>>Maybe you know it >>>I do not know it and I believe the programmer. >>> >>>I believe that it is not impossible to do it and >>>the fact that other programs are not close to do it >>>means nothing. >>> >>>It is possible that spidderchess use different search rules >>>than other programs. >>> >>>I also plan to use different search rules >>>that are going to help my program to solve it faster but >>>I need to compare them with the known search rules >>>also in other positions before deciding if >>>it is a good idea to use them. >>> >>> >>>Uri >> >> >>It's indeed true that SpiderChess uses different searchrules. >>I try to simulate the human chessplayer. I try ... >>And in this position it works! Now all those other positions :) >> >>Martin > > > >Yes from looking at the PV and the nominal search depth it looks like >SpiderChess does not stop at the nominal depth. For example IIRC at ply depth 5, >the PV was 13 plies long (not ending with captures or checks). > >Or maybe ply depth 5 means that the first 5 plies are looked at in "brute force" >mode, and the next plies with a selective search? That's how Genius displays its >depth, so SpiderChess depth cannot be compared with other programs depths? > > > > Christophe Hi Christophe, What you see beyond the nominal depth are extensions. There is some selectivity before that but not much. The program doesn't use nullmove. Extensions may go very deep along narrow, more or less human paths, so if the program says "depth = 6" you cannot really trust that. But it's probably not the same as Genius. Martin
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