Description of CFEN

Positions are described in a modified version of Forsyth-Edwards Notation dubbed CFEN. This new format simply removes the fields "castling availability", "en-passant square", and "half-move clock". The position description segment contains one extra file and rank.

The following characters are used to represent pieces:

Example: rheakaehr/9/1c5c1/p1p1p1p1p/9/9/P1P1P1P1P/1C5C1/9/RHEAKAEHR r 1