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<fentt border="none" style="font-size:16pt">rnbqkbnr/pp1ppppp/8/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R</fentt> 1.e4 c5 2.Nf3
rnbqkbnr/pp1ppppp/8/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R b KQkq - 1 2
=Chess960=
==Shredder-FEN==
'''Shredder-FEN''' or '''SMK-FEN''' is an extension of FEN covering [[Chess960]], introduced by [[Shredder]] author [[Stefan Meyer-Kahlen]] (SMK) in 2005.
Shredder-FEN uses different [[Castling Rights|castling right]] characters, that is instead of '''KQkq''', upper case and lower case [[Files|file characters]] of the affected rooks for white and black castling rights, and became a [https://en.wikipedia.org/wiki/De_facto_standard de facto standard] supported by most [[GUI|GUIs]] and [[Protocols|protocols]].
==X-FEN==
The earlier [https://en.wikipedia.org/wiki/X-FEN X-FEN] extension was introduced by [[Reinhard Scharnagl]] in 2003, and covers not only [[Chess960]] but also 10x8 variants. Its author dogmatically claimed upward compatibility with standard chess <ref>[https://www.stmintz.com/ccc/index.php?id=437213 Why to use compatible X-FEN (in Chess960)] by [[Reinhard Scharnagl]], [[CCC]], July 17, 2005</ref>, still using the '''KQkq''' [[Castling Rights|castling right]] characters for all Chess960 positions where the king is between both rooks - and the [[Files|file characters]] otherwise. Further, X-FEN introduced a changed [[En passant|en passant]] target square semantic, which is only specified after a double pawn push was made beside an opponent pawn that might capture en passant if legal, that is not leaving its king in check.
=See also=
==2000 ...==
* [https://www.stmintz.com/ccc/index.php?id=138460 File name extensions] by [[Leen Ammeraal]], [[CCC]], November 14, 2000
* [https://www.stmintz.com/ccc/index.php?id=314898 Ten years later: revising EPD/FEN/PGN] by [[Steven Edwards]], [[CCC]], September 09, 2003
* [https://www.stmintz.com/ccc/index.php?id=323898 Making positions in eps] by [[Jan Renze Steenhuisen|Renze Steenhuisen]], [[CCC]], October 27, 2003 » [[Forsyth-Edwards Notation#FEN2EPS|Fen2eps]]
==2005 ...==
* [https://www.stmintz.com/ccc/index.php?id=437213 Why to use compatible X-FEN (in Chess960)] by [[Reinhard Scharnagl]], [[CCC]], July 17, 2005
* [https://www.stmintz.com/ccc/index.php?id=439792 Chess960: X-FEN rules international] by [[Reinhard Scharnagl]], [[CCC]], August 03, 2005
* [https://www.stmintz.com/ccc/index.php?id=439995 contradicting FEN and SMK-FEN] by [[Reinhard Scharnagl]], [[CCC]], August 04, 2005
* [http://www.talkchess.com/forum/viewtopic.php?t=13923 fen to fen functions] by [[Uri Blass]], [[CCC]], May 21, 2007
