Computer Chess Club Archives




Subject: Re: Nodes per second........

Author: Bruce Moreland

Date: 22:38:04 09/27/98

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On September 26, 1998 at 17:30:09, John Coffey wrote:

>This is an interesting question, because Robert Hyatt told me the other day
>that it was the size of the tree and not the NPS that really matter.  When
>I looked at the Crafty source code, I was surprised at how much code that
>gets executed for every single node.  But the main purpose of that code is
>to cut down the size of the tree (using null moves, hash tables, move ordering,
>etc.) That tree  grows exponentially, so cutting it from say 6^N down to 3^N
>is a huge improvement regardless of the number of nodes per second.

You could spend a relative eternity on each node near the root of the tree, and
if you only got a few percent reduction in tree size it would be a win.  Out
near the tips you have to be a more careful.


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