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Subject: Re: Why to use compatible X-FEN (in Chess960)

Author: Reinhard Scharnagl

Date: 13:20:15 07/18/05

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On July 18, 2005 at 14:50:28, Dann Corbit wrote:

>Shredder's approach is the one that everyone else is going to copy.
>
>It is a commerical program with a lot of success.

in this case - trying to establish incompatibilities - it is not yet helpful.

>Unless there were some dominating superiority of the other approach, we can
>assume that the successful commercial model is what will be copied (since it is
>published).

Since years there is a working and accepted X-FEN (formerly FRC-FEN), which is
fully compatible to FEN, encoding all positions the same way as FEN, as long
there would not exist any castling related to unusual K-R placements.

http://www.chessbox.de/Compu/fullchess5b_e.html

>Consider the success of UCI (also pioneered by SMK).

I have worked together with M. Diosi etc. for ideas to make Arena compatible to
UCI and Chess960, but we were waiting during the last time to have a compatible
extension from SMK. I also currently have made such a proposal to prove that
this would be 100% possible.

It is me who structured and enumerated all 960 Chess960 starting positions,
created an easy two-table scheme fitting at one page
http://www.chesstigers.de/download/chess960_regeln.pdf, I have written the only
existing book on Chess960 in german language
http://www.chessbox.de/Compu/fullchess1_e.html, have written a chessprogram
consisting of GUI and engine SMIRF http://de.geocities.com/rsmuenchen/ (beta
version downloadable in three languages, 8x8 and 10x8 chess variants, key to be
requested by email) using and producing FEN and PGN 100% compatibly ...

If I say, that Shredder FEN is not compatible because it is encoding identical
positions into different FEN strings depending on the view of Shredder, you
could rely on that. PGN demands for a unic encoding of games, thus same is valid
for FEN strings.

My suggested proposals to avoid such incompatibilities have been completely
ignored, which is hardly to be understood.

I hope, that SMK nevertheless would be able to make some little improvements,
he is an intelligent man and should be able to use also information from third
side, which in this case also has experiences in building Chess960 GUIs etc..

Reinhard Scharnagl



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