Chess

The main move validation module. FEN parsing code is in Chess.FEN and PGN parsing is in Chess.PGN

Documentation

data MoveError

Constructors

WrongTurn

It's not your turn

NoPiece

There is no piece at the from position

IsCheck

Your king is checked and this move doesn't solve that

CausesCheck

After this move your king would be checked

InvalidMove

This is not how that piece works

OverPiece

You cannot move over other pieces

CapturesOwn

This move captures one of your own pieces

NoParse

I don't understand what you mean

Instances

Eq MoveError

Show MoveError

data Color

Constructors

Black

White

Instances

Eq Color

Show Color

data PieceType

Constructors

Rook

Knight

Bishop

Queen

King

Pawn

Instances

Eq PieceType

Show PieceType

data Piece

Constructors

Piece

Fields

clr :: Color

piece :: PieceType

Instances

Eq Piece

Read Piece

Show Piece

data Board

Constructors

Board

Fields

turn :: Color

castlingAvail :: String

enpassant :: Maybe (Int, Int)

board :: Array (Int, Int) (Maybe Piece)

Instances

Eq Board

Show Board

strToPos :: String -> (Int, Int)

Takes a position like a5 and returns the coordinates (0,4)

pieceAt :: Int -> Int -> Board -> Maybe Piece

Like pieceAtStr, but with coordinates instead of a string

pieceAtStr :: String -> Board -> Maybe Piece

What piece is currently at this position on the board?

move :: [Char] -> Board -> Either MoveError Board

Perform a move on the board in coordinate notation like e2e4, returning either the new board or an error

moveSAN :: [Char] -> Board -> Either MoveError Board

Perform a move in SAN notation on the board and return either the new board or an error

check :: Color -> Board -> Bool

Is the player of the given colour check?

mate :: Color -> Board -> Bool

Is the player with the given colour checkmate

stalemate :: Color -> Board -> Bool

Can the player of the given colour make any move?