Computer Chess Club Archives




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

Author: Robert Hyatt

Date: 06:35:12 07/22/00

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On July 22, 2000 at 08:46:25, leonid wrote:

>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.
>Thanks for response,

This is way too hard to answer directly, because it varies by program and
by approach.  My NPS doesn't change much, because of the way my move generator
works.  I have noticed that Ferret is just the opposite and speeds up
significantly in the endgame.

The question is, as the game progresses, how much work do you save when a piece
comes off the board?  IE it might be almost as expensive to ask "is there a
white bishop to generate moves for?" as it is to actually generate those
moves.  In such a case, you won't speed up very much in endgames...

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