shakmaty::fen
pub fn fen(setup: &dyn Setup) -> String
Create a FEN such as rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 with default FenOpts.
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
FenOpts