"fen Fred" -- shows the FEN format moves of Fred's current game
"fen" -- shows FEN format moves for the game you are playing
or examining
Displays the Forsyth-Edwards notation (FEN) for the current position in a
game. If no argument is provided, and you are in a match, it lists the
moves for your game. FEN is described in
http://www.very-best.de/pgn-spec.htm#16.1
and also in section 16.1 of help pgn-spec.
For library games or other stored gams, use the sfen command instead.