Game.Chess

A small collection of data types and functions to represent Chess positions and moves including move generation and parsing from external sources.

This module does deliberately not implement any search or evaluation functionality. It is intended to be used to lay the ground for communicating with other programs or players, hence the package name chessIO.

Chess positions

data Color

Constructors

White

Black

Instances

Eq Color

Defined in Game.Chess

Methods

(==) :: Color -> Color -> Bool

(/=) :: Color -> Color -> Bool

Show Color

Defined in Game.Chess

Methods

showsPrec :: Int -> Color -> ShowS

show :: Color -> String

showList :: [Color] -> ShowS

opponent :: Color -> Color

data Sq

Constructors

A1

B1

C1

D1

E1

F1

G1

H1

A2

B2

C2

D2

E2

F2

G2

H2

A3

B3

C3

D3

E3

F3

G3

H3

A4

B4

C4

D4

E4

F4

G4

H4

A5

B5

C5

D5

E5

F5

G5

H5

A6

B6

C6

D6

E6

F6

G6

H6

A7

B7

C7

D7

E7

F7

G7

H7

A8

B8

C8

D8

E8

F8

G8

H8

Instances

Bounded Sq

Defined in Game.Chess

Methods

minBound :: Sq

maxBound :: Sq

Enum Sq

Defined in Game.Chess

Methods

succ :: Sq -> Sq

pred :: Sq -> Sq

toEnum :: Int -> Sq

fromEnum :: Sq -> Int

enumFrom :: Sq -> [Sq]

enumFromThen :: Sq -> Sq -> [Sq]

enumFromTo :: Sq -> Sq -> [Sq]

enumFromThenTo :: Sq -> Sq -> Sq -> [Sq]

Eq Sq

Defined in Game.Chess

Methods

(==) :: Sq -> Sq -> Bool

(/=) :: Sq -> Sq -> Bool

Show Sq

Defined in Game.Chess

Methods

showsPrec :: Int -> Sq -> ShowS

show :: Sq -> String

showList :: [Sq] -> ShowS

isLight :: Sq -> Bool

isDark :: Sq -> Bool

data PieceType

Constructors

Pawn

Knight

Bishop

Rook

Queen

King

Instances

Eq PieceType

Defined in Game.Chess

Methods

(==) :: PieceType -> PieceType -> Bool

(/=) :: PieceType -> PieceType -> Bool

Show PieceType

Defined in Game.Chess

Methods

showsPrec :: Int -> PieceType -> ShowS

show :: PieceType -> String

showList :: [PieceType] -> ShowS

data Position

Instances

Eq Position

Defined in Game.Chess

Methods

(==) :: Position -> Position -> Bool

(/=) :: Position -> Position -> Bool

startpos :: Position

The starting position as given by the FEN string "rnbqkbnrpppppppp8888PPPPPPPP/RNBQKBNR w KQkq - 0 1".

color :: Position -> Color

pieceAt :: Position -> Sq -> Maybe (Color, PieceType)

Converting from/to Forsyth-Edwards-Notation

fromFEN :: String -> Maybe Position

Construct a position from Forsyth-Edwards-Notation.

toFEN :: Position -> String

Convert a position to Forsyth-Edwards-Notation.

Chess moves

data Move

Instances

Eq Move

Defined in Game.Chess

Methods

(==) :: Move -> Move -> Bool

(/=) :: Move -> Move -> Bool

Show Move

Defined in Game.Chess

Methods

showsPrec :: Int -> Move -> ShowS

show :: Move -> String

showList :: [Move] -> ShowS

Converting from/to algebraic notation

fromSAN :: Position -> String -> Either String Move

fromUCI :: Position -> String -> Maybe Move

Parse a move in the format used by the Universal Chess Interface protocol.

toUCI :: Move -> String

Convert a move to the format used by the Universal Chess Interface protocol.

Move generation

moves :: Position -> [Move]

Generate a list of possible moves for the given position.

Executing moves

applyMove :: Position -> Move -> Position

unsafeApplyMove :: Position -> Move -> Position