Format guide
FEN
Forsyth–Edwards Notation
FEN is a single-line text representation of one chess position, piece placement, side to move, castling rights, en passant target, halfmove clock, and fullmove number. Used by chess engines for position analysis, by chess servers for sharing puzzles, and by GUIs for board setup. Unlike PGN (which represents a game), FEN represents a single static position.
How to open a FEN file
Any chess engine, GUI, or website's analysis board. Just paste the FEN string.
Primary use
Sharing chess positions for analysis.
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