Author: Christophe Theron
Date: 10:13:25 09/25/00
Go up one level in this thread
On September 25, 2000 at 01:38:15, Jouni Uski wrote:
>In my moderate AMD K6-2 450Mhz and 50 MB hash it exceeds easily 1000knps in
>tactical positions and sometimes goes over 1300knps. Of course I know this means
>almost nothing to playing strength, but still it's unbelievable. I wonder can
>it be true nps value or has Michael B. his own node definition...
>
>Jouni
It's not that unbelievable. I can easily reach this speed with Chess Tiger if I
turn off some time consuming selective algorithms and some evaluation terms.
One very efficient thing to get a high NPS is the following: when you are in
check, generate all the pseudo legal moves, try them one by one until you get a
legal escape from check. The smart way is to write a generation routine that
generates only the truly legal moves. It is more efficient, but it has a smaller
NPS. :)
A similar idea is to generate all the moves in QSearch, try them one by one and
prune away non-capture moves. It is less efficient than generating only the
captures, but I guess I could get a 2M NPS if I did this.
NPS has clearly nothing to do with playing strength. Kasparov's NPS sucks.
Christophe
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