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Subject: Re: Conversion to dual positions for EPD testsuites?

Author: Andrew Williams

Date: 01:01:24 11/27/01

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On November 27, 2001 at 03:53:49, Andreas Stabel wrote:

>On November 27, 2001 at 03:48:09, Andrew Williams wrote:
>
>>On November 27, 2001 at 00:52:58, Leen Ammeraal wrote:
>>
>>>On November 26, 2001 at 17:58:38, Vincent Diepeveen wrote:
>>>
>>>>On November 26, 2001 at 12:47:59, Dann Corbit wrote:
>>>>
>>>>>On November 26, 2001 at 12:43:49, Leen Ammeraal wrote:
>>>>
>>>>>By the permutator viewer of Les Fernandez.
>>>>
>>>>Or one mouse click in DIEP or in Shredder5 :)
>>>
>>>This may be very useful for single positions, but
>>>what I want is a conversion program to convert
>>>a testsuite, say wac.epd, into another testsuite,
>>>say wacDual.epd, in which the roles of White and
>>>Black are reversed, including the final part
>>>(bm ...) of each line, as I showed in my example.
>>>Therefore I am afraid this permutation viewer
>>>suggested by Dann is not precisely what I want
>>>either.
>>>It might have been easier for me to write
>>>this rather simple conversion program myself
>>>than writing all these postings -:).
>>>Leen
>>
>>There is such a tool. It's called rfen.c I'll
>>send it to you, but you have to compile it
>>yourself. I'm afraid I don't know the origin of
>>it. I know that the author sent it to me a few
>>years ago, then I lost it and someone else sent
>>me a copy.
>>
>>Andrew
>
>I think I have made the program. It can transform FEN positions in many was
>like switch black and white, mirror left and right side (if no castling) and
>it can even rotate a position 90 degrees if there are no pawns.
>If I remember correctly, it processes a whole file of one line FEN positions.
>I hope you find it useful (if it really is the program I wrote :)
>
>Regards
>Andreas Stabel

That's right! Thanks Andreas. You know, you should put your name in the
source file so that people know who to be grateful to! :-)

It has proved REALLY useful to me over the years. I often test my evaluation
function by reversing a whole test suite and running my eval against both
sets. I have a special mode which prints out the scores from White's point
of view so I can compare the outputs very easily. I'm 100% certain I'm not
the only programmer who uses rfen in this way.

Thanks again Andreas.

Regards

Andrew



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