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==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=
* [[Forsyth-Edwards Expanded Notation]] (FEEN)
* [[Portable Game Notation]] (PGN)
* [[BMI2#FEN Compression|BMI2 FEN Compression]]
=Forum Posts=
==1993 ...==
* [https://groups.google.com/d/msg/rec.games.chess/MkLV6dIwGU4/GfbtTyR6o6sJ Revised PGN standard available] by [[Steven Edwards]], [[Computer Chess Forums|rgc]], December 20, 1993» [[Portable Game Notation]]
* [https://www.stmintz.com/ccc/index.php?id=53266 Full definition for FEN] by [[Dann Corbit]], [[CCC]], May 27, 1999
==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 » [[Portable Game Notation]]
* [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=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
* [https://www.stmintz.com/ccc/index.php?id=459898 Chess960: Arena castle vs X-FEN castle] by [[Matthias Gemuh]], [[CCC]], November 05, 2005
* [http://www.talkchess.com/forum/viewtopic.php?t=13923 fen to fen functions] by [[Uri Blass]], [[CCC]], May 21, 2007
==2010 ...==
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73552 FEN and 3rd repetition rule. No information?] by [[Luis Babboni]], [[CCC]], April 03, 2020 » [[Repetitions]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=76892 FEN compression] by lucasart, [[CCC]], March 17, 2021 » [[BMI2#FEN Compression|FEN Compression]], [[NNUE#Training|NNUE Training]]* [https://www.talkchess.com/forum3/viewtopic.php?f=7&t=79627 Required fields in Forsyth-Edwards Notation (FEN)] by [[Niels Abildskov]], [[CCC]], April 02, 2022
=External Links=
* [https://en.wikipedia.org/wiki/Forsyth-Edwards_Notation Forsyth-Edwards Notation from Wikipedia]
: [http://www.gilith.com/software/fen2img/ fen2img Chess Diagram Maker] by [[Joe Leslie-Hurd]]
* [http://webchess.freehostia.com/diag/index.php Chess Diagram Generator]
* [https://github.com/bagaturchess/ChessBoardScanner GitHub - bagaturchess/ChessBoardScanner: Java based Chess Board Scanner, which converts 2D chess board image into a machine readable format a.k.a. Forsyth–Edwards Notation (FEN)] by [[Krasimir Topchiyski]]
* [http://chessforeva.blogspot.de/2009/10/3d-chess-diagram-from-fen.html Chessforeva: 3D chess diagram from FEN] » [[3D Graphics Board]]
* <span id="FEN2EPS"></span>[http://fen2eps.sourceforge.net/ Fen2eps] by [[Dirk Baechle]] <ref>[https://en.wikipedia.org/wiki/Encapsulated_PostScript Encapsulated PostScript from Wikipedia]</ref>
