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6

The FEN consists of six parts (see definition of FEN here): piece placement: at most 64 characters, one for each square plus 7 times "/" to delimit ranks = 71 characters active color: one character ("w" or "b") castling: at most 4 characters en passant: one or two characters half move clock full move number In addition there are 5 space characters between ...


4

Using the definition of FEN it is relatively straightforward to compute an upper bound: piece placement: 64 (pieces/squares) + 7 (slashes) color: 1 (w/b) castling: 4 (KQkq) en passant: 2 (e3) halfmove clock: 3 (100) fullmove number: 4 (considering that maximum game length < 9999 due to the 50-move rule) spaces between fields: 5 So in total we get as an ...


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