Type representing a chess piece, with a color (white or black) and a type (pawn, bishop, knight, etc.).

Create a piece with the given color and type.

make PieceColor.white PieceType.queen == whiteQueen


make PieceColor.black PieceType.knight == blackKnight

Get the color of a piece.

color whiteBishop == PieceColor.white


color blackQueen == PieceColor.black

Get the type of a piece. Unfortunately, the name type is taken, so we have to use an awkward name.

kind whiteBishop == PieceType.bishop


kind blackQueen == PieceType.queen

List of all pieces

A white pawn.

A white knight.

A white bishop.

A white rook.

A white queen.

A white king.

A black pawn.

A black knight.

A black bishop.

A black rook.

A black queen.

A black king.

Tries to convert a character to a piece, using Forsyth-Edwards notation. Uppercase letters become white pieces, lowercase letters become black pieces. If the character is not a valid piece letter, returns Nothing.

fromChar 'R' == Just whiteRook


fromChar 'q' == Just blackQueen


fromChar 'x' == Nothing

Tries to convert a string to a piece by inspecting the first character and using Forsyth-Edwards notation. Uppercase letters become white pieces, lowercase letters become black pieces. If the character is not a valid piece letter, or if the string is empty, returns Nothing.

fromString "R" == Just whiteRook


fromString "Kbb" == Just whiteKing


fromString "q" == Just blackQueen


fromString "x" == Nothing

Converts a piece to its corresponding character in Forsyth-Edwards notation. White pieces become uppercase letters, black pieces become lowercase letters.

toChar whiteRook == 'R'


toChar blackQueen == 'q'

Converts a piece to a single-character string containing the pices's corresponding character in Forsyth-Edwards notation. White pieces become uppercase letters, black pieces become lowercase letters.

toString whiteRook == "R"


toString blackQueen == "q"