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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:

>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.
>
>Thanks for response,
>Leonid.


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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