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Subject: Re: Is the NPS tend to grow at the end of the game?

Author: Robert Hyatt

Date: 06:37:22 07/22/00

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On July 22, 2000 at 09:20:23, Josť 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...


>>Thanks for response,
>>Leonid.
>
>  Hope this helps.
>
>  Josť C.



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