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Subject: Re: Value of playing different versions of a program against each other

Author: Dann Corbit

Date: 15:24:31 01/06/03

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On January 06, 2003 at 17:40:53, Lieven Clarisse wrote:

>On January 06, 2003 at 16:56:35, Tom King wrote:
>
>>Hi all,
>>
>>What do people think about playing different versions of your program against
>>each other as a way of testing?
>>
>>I'm playing around with it right now, between v0.07 and a newer version of my
>>program. The newer version is winning handsomely: +24,=18,-10.
>>
>>This implies a reasonably impressive increase in strength, almost 100 ELO. Ok,
>>ok, it's a small sample, so the margin of error could be big.
>>
>>However, my gut feel is that playing different versions of your programs tends
>>to overstate the strength differences. What do people think?
>>
>
>The best way IMHO is to test it against engines with more or less equal
>strenght. You can use WBEC ratinglist to get an idea of the strenghts of the
>different engines. Try to find a range were your program gets %50 score (for
>instance range 40-50 from the ratinglist, when changing your program and see you
>get >60% (for a sufficient large numbere of games) it is time to play against
>the range 35-45, etc.. Strength is best measured when playing equal opps.

I disagree.  I think you get better results from two sets:
1.  Programs that are about 100 ELO weaker.
2.  Programs that are about 100 ELO stronger.

When the programs are about the same strength, you get too much coin toss
effect.




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