chess:programming:fen_forsyth-edwards_notation
This is an old revision of the document!
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.
The starting position:
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
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.
chess/programming/fen_forsyth-edwards_notation.1635802154.txt.gz · Last modified: 2021/11/01 21:29 by peter