Show-fen plugin for WordPress

The Show-FEN plugin can be used on WordPress sites to display chess diagrams by only inserting the FEN string within the <fen> and </fen> tags. The circle at the upper right corner is used to indicate the move color.  In addition to the original functionality the letterx x, o and v may be used.

The most recent version of the Show-FEN plugin v1.5 can be downloaded here.

Ater downloading and unzipping the plugin to an appropriate directory you still have to change the line

$path = “http://your.domain.name/plugindir/”;

to something which corresponds to the directory in which the pictures of the chess pieces can be found.

A description of this FEN notation can be found in Wikipedia.

A FEN “record” defines a particular game position, all in one text line and using only the ASCII character set.

A FEN record contains 6 fields. The separator between fields is a space. The fields are:

1. Piece placement (from white’s perspective). Each rank is described, starting with rank 8 and ending with rank 1; within each rank, the contents of each square are described from file a through file h. White pieces are designated using upper-case letters (“KQRBNP”), Black by lowercase (“kqrbnp”). Blank squares are noted using digits 1 through 8 (the number of blank squares), and “/” separate ranks.
2. Active color. “w” means white moves next, “b” means black.
3. Castling availability. If neither side can castle, this is “-”. Otherwise, this has one or more letters: “K” (White can castle kingside), “Q” (White can castle queenside), “k” (Black can castle kingside), and/or “q” (Black can castle queenside).
4. En passant target square in algebraic notation. If there’s no en passant target square, this is “-”. If a pawn has just made a 2-square move, this is the position “behind” the pawn.
5. Halfmove clock: This is the number of halfmoves since the last pawn advance or capture. This is used to determine if a draw can be claimed under the fifty move rule.
6. Fullmove number: The number of the full move. It starts at 1, and is incremented after Black’s move