Taker Forsyth–Edwards (in the form of summary FEN or fan) is a standard markup to describe the conditions on a chess board. This method of notation all the necessary information to rearrange a page and transfer all information related to it has.

fan is a journalist Scottish, the name David Forsyth was proposed by Steven Development found.

fan can be just in a line, and using characters ski a chess board to define. In the computer world files, a fan with extensions .fen are specified.