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Subject: What is meant by NPS?

Author: david burrell

Date: 23:41:45 08/08/99


There is a huge variation between the NPS reported by a variety of
chess software. I realize that there are many factors that might
effect NPS like move-ordering, complexity of static eval, hashing etc.
but perhaps not all chess programs count the same thing.

So what do you define NPS as? I would count calls to make-move. This is
what my program does. I have heard that some people count total nodes
generated by movgen and others count only leaf nodes.

I am concerned that my program is very slow, about 15K NPS in opening
positions on a P200, (crafy reports about 50K NPS). How does crafty
count NPS?

If the LG2000 winboard engine has peaked at over 1M NPS on a K6-2/450
then surely LG2000 is not counting calls to make-move 1M is very high!!

Any comments would be greatly appreciated. Thanks.

David.



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