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Subject: Re: Chess program similarity experiment (Results)

Author: Albrecht Heeffer

Date: 23:24:07 01/27/99

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On January 27, 1999 at 22:18:50, Robert Hyatt wrote:

>
>
>I am running bruce's epd suite for bionic-to-move positions on my quad
>xeon box... using version 15.20... but I just realized how we ought to
>do this... much faster, much more accurate, much less work:
>
>simply take the bionic executable, _and_ the wcrafty-15.20 executable from
>my ftp machine, and run them on this suite on the same machine (one cpu
>only preferably) to the same time limit, and compare the results.  That
>takes out _all_ variability...  it ought to be run to 1 min, 2 min and then
>3 min, just to allow for search speed variability for whatever they did.
>But the 1 min each run first might really answer the question about how close
>they are.
>
>My 15.20 run is matching a lot of moves, most of them in fact, so far.  I am
>running at 1 min per move, which at 1600mhz is about like 1.5 mins or so on
>their hardware which I believe was about 1100mhz total...
>
>I'll post results probably in the morning.  I am using the epdpfga command to
>produce one normal epd output record for each input line...  using 'st=60'
>to set the time before doing the epd command, and I am running with hash=96M
>and hashp=20M, not knowing exactly what they used...
>
>more later...

The log files published on the website give the exact settings for each
game. In the Open Dutch Tournament we used:
hash=96M
hasp=10m
You can also compare nps statistics to match the same conditions.
We reached on average 385.000 nodes and we are about 10% slower
than Crafty 15.20 on the same hardware.
I'm curious about your results.

Albrecht Heeffer



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