Author: leonid
Date: 10:57:28 02/09/01
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On February 09, 2001 at 11:36:04, Heiner Marxen wrote: >On February 09, 2001 at 06:51:15, leonid wrote: > >>On February 09, 2001 at 06:47:28, leonid wrote: >> >>>Hi! >>> >>>If you like to solve a forced mate, you can try this position: >>> >>>[D]1bqQBnRn/3N2Qb/Q1QN2np/1Q1Q1qpk/4Qqbn/2B1Qrnn/2Q5/K1R5 w - - >>> >>>Please, indicate your result. > >Chest find a mate in 7 with 1.Qxg5+: >Qxg5+ Nxg5 Qdxf5 Nhxf5 Qh2+ Bh3 Nf6+ Kh4 Qxh6+ Nxh6 Q4xf4+ Ng4 Qfxg5# > >(3.3 hours, K7/600 350MB hash) > >>>By curiosity I looked what is the NPS (nodes/second) for this position. Since >>>the number of moves, during the solution of mate went quit often up to 130 for >>>whites, NPS was more that impressive. If it could be the same all the time! On >>>It went up in around 60% as average. It is the same for your program? NPS depend >>>greatly on number of average moves existing in each ply? >>> >>>Thanks, >>>Leonid. > >For Chest on your crowded boards NPS greatly decreases, by a factor around >2 or 3. Some of the heuristics to gain speed, do not pay off, anymore. >Hmmm, may be I should improve my heuristics ;-) >The reduced NPS does not worry me, as long as the job is done quickly. > >Heiner Heiner, don't worry about your NPS! What I forget to mention is that I looked into NPS not for mate solver (still don't have there NPS counter) but by seeing it in other part of my chess program. There NPS when up in impressive way for brute force search. If 300k is very good in middle of game (normal position), NPS counter for blacks went up to 520k. For whites it was not that high, around 350k. Average number of NPS for my program (brute force) in middle of the game is around 250k on AMD 400Mhz. Thanks for saying exact number of moves for position! Will write it on my printed position for later use. Leonid.
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