Forsyth–Edwards Notation (FEN) is a standard notation for describing a particular board position of a chess game. The purpose of FEN is to provide all the necessary information to restart a game from a particular position.
OFEN is a derivation of FEN to support the features of Octad.
Read more about the OFEN structure here.
Here is the OFEN for the starting position:
ppkn/4/4/NKPP w NCFncf - 0 1
Here is the OFEN after the move 1. c2:
ppkn/4/2P1/NK1P b NCFncf - 0 1