Forsyth-Edwards+Expanded+Notation

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 * Forsyth-Edwards Expanded Notation (FEEN)** describes a Chess Position. It is an one-line string. **FEEN** is based on FEN. Cyril Wack specified the **FEEN format** for cross-board and cross-style computer chess applications, that is for Shogi, Western chess, Xiangqi and for more than two dimensions, e.g. 3D chess. FEEN is a proposal by Cyril Wack. So far there are no programs or protocols supporting it.

=FEEN Syntax= One FEEN string or record consists of **three** fields separated by a space character.

//[|Terminal and nonterminal symbols] of a variant of [|BNF] below are embedded in ' ' resp. < >.//

 ::=  ' '

  ' '

 

Piece Placement
The Piece Placement is determined in big-endian order, from a flatten board where each dimension is separated by the terminal symbol '/' (slash), and each piece is separated by a ',' (comma character). The pieces are identified according to the Portable Chess Notation. Uppercase letters are for //Bottom// pieces, lowercase letters for //Top// pieces.

Active side
The side to move is one lowercase letter for either //bottom// ('B') or //top// ('t').

 ::= {'B' | 't'}

Captured actors
Captured actors MUST be listed here. The actors are listed in alphabetical order, separated by an empty string. If neither player has any captured actors, for instance on an initial position, this MUST be '-'.

Note: Captured actors are said to be in hand at Shogi.

=Samples= FEEN strings of //starting position//:

♜♞♝♛♚♝♞♜ /♟♟♟♟♟♟♟♟/8/8/8/8/ ♙♙♙♙♙♙♙♙/♖♘♗♕♔♗♘♖ B -

And after 1.e4:

♜♞♝♛♚♝♞♜ /♟♟♟♟♟♟♟♟/8/8/4♙3/8/ ♙♙♙♙ 1 <span style="background-color: #f8f8f8; color: #333333; font-family: Menlo,Monaco,Consolas,'Courier New',monospace;">♙♙♙/♖♘♗♕♔♗♘♖ t -

=Forum Posts=
 * [|FEEN?] by Gerd Isenberg, CCC, September 02, 2013

=External Links=
 * [|Forsyth–Edwards Expanded Notation specification and implementation guide] by Cyril Wack
 * [|Portable Chess Notation specification and implementation guide] by Cyril Wack

=What links here?= include page="Forsyth-Edwards Expanded Notation" component="backlinks" limit="50"
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