The logic of handling a chessboard and parsing standard FEN
(Farnsworth-Edwards Notation) for describing a position as well as SAN
(Standard Algebraic Notation) for describing individual moves is
handled. This class can be used as a backend driver for playing chess,
or for validating and/or creating PGN files using the File_ChessPGN
package.

Although this package is alpha, it is fully unit-tested. The code
works, but the API is fluid, and may change dramatically as it is put
into use and better ways are found to use it. When the API stabilizes,
the stability will increase.