Author: José Carlos
Date: 07:02:49 07/22/00
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On July 22, 2000 at 09:37:22, Robert Hyatt wrote: >On July 22, 2000 at 09:20:23, José Carlos wrote: > >>On July 22, 2000 at 08:46:25, leonid wrote: >> >>>Hello! >>> >>>Is the nodes per second number tend to grow when program search position more >>>advanced in the game? When there are less pieces on the board. >>> >>>I just speeded my program in around 30% and tried to find where my nps is now. >>>Went to the Fritz 6 counter (Fritz engin inside of Hiarcs package) and was >>>disappointed. Fritz still keep me at the safe distance at the end of the game. >>>This is due to the strange (for me) fact that Fritz numbers goes up at the end >>>of the game. This time in mine nps goes down. In mine program less are the >>>pieces on the board, less efficency in the search of the legal moves. Wanted to >>>see if there are some general tendency in all programs. Before asking here my >>>question, went to see Rebel 10. Its numbers looks like to be very stable. No big >>>difference between heavy initial and final positions. Once again difference with >>>my program. >> >> My program (Averno) usually searches 300% faster (in nps) in the endgame. I >>never have thought about it cause I saw it natural, but if I think a little, I >>can give some reasons: >> >> - My evaluation in the endgame is easier (no king-safety code). >> - Less moves generated = less time spent generating moves. :) > >This can hurt as well as help. If you generate one move, the overhead for >calling search recursively and so forth is spread over one move, rather than >many... > > > >> - Better use of trans/ref table (many more transpositions). >> > >I'm not sure this should increase your NPS. It sure ought to make your >search go deeper, quicker, however... Yeah, your answer looks correct in both cases, so I'll have to think longer about why the 300% increase... It can't be only for the king-safety evaluation, because it's not that slow, maybe my mobility calculation hurts the nps ratio when there're many pieces... Mmmm, something to think about this weekend. José C. >>>Thanks for response, >>>Leonid. >> >> Hope this helps. >> >> José C.
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