====== Chess - Programming - FEN (Forsyth-Edwards Notation) ======

**FEN** is a standard notation for describing a particular board position of a chess game.

  * The purpose of FEN is to provide all the necessary information to restart a game from a particular position.

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The starting position:

<code>
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
</code>

<WRAP info>
**NOTE:**  A FEN record contains six fields, separated by spaces.

The fields are:

  * Piece placement.
    * **rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR**:  The Piece Placement.
    * **/**:  The next rank.
    * **Digits 1-8**: The number of empty squares until the next piece on the rank.

  * Active color:
    * **w** means White moves next, 
    * **b** means Black moves next.

  * Castling availability.
    * **-**:  Neither side can castle.
    * **K**: White can castle kingside,
    * **Q**: White can castle queenside,
    * **k**: Black can castle kingside,
    * **q**: Black can castle queenside.

  * En passant target square in algebraic notation:
    * **-**:  There is no en passant target square.
    * This is recorded regardless of whether there is a pawn in position to make an en passant capture.

  * Halfmove clock: The number of halfmoves since the last capture or pawn advance, used for the fifty-move rule.
    
  * Fullmove number: The number of the full move. It starts at 1, and is incremented after Blacks move.

</WRAP>

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[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Ambiguation|Test Ambiguation]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Castling|Test Castling]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Castling Prevented|Test Castling Prevented]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Castling|Test Castling]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Discovered Check|Test Discovered Check]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Double Check|Test Double Check]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test End Games|Test End Games]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Enpassant capture gives check|Test Enpassant capture gives check]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Huge Number of Moves|Test Huge Number of Moves]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Incorrect Positions|Test Incorrect Positions]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Long castling gives check|Test Long castling gives check]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Move Generation|Test Move Generation]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Pawn Shield|Test Pawn Shield]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Perft|Test Perft]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Positions|Test Positions]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Promote out of check|Test Promote out of check]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Promotion gives check|Test Promotion gives check]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Self Stalemate|Test Self Stalemate]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Short castling gives check|Test Short castling gives check]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Stalemate|Test Stalemate]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Static Exchange|Test Static Exchange]]

[[Chess:Programming:FEN (Forsyth-Edwards Notation):Test Underpromotion gives check|Test Underpromotion gives check]]


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===== References =====

https://timkr.home.xs4all.nl/records/records.htm