Position

This module defines the Position data type, which is used to model chess positions.

Types

type alias Position =

Position

Type representing a chess position.

Useful Constants

initial : Position

The standard starting position.

Properties of Positions

sideToMove : Position -> PieceColor

The current side to move.

pieceOn : Square -> Position -> Maybe Piece

The piece on the given square, or Nothing if the square is empty.

colorOn : Square -> Position -> Maybe PieceColor

The color of the piece on the given square, or Nothing if the square is empty.

isEmpty : Square -> Position -> Bool

Tests whether the given square on the board is empty.

epSquare : Position -> Maybe Square

The en passant square, or Nothing if no en passant capture is possible.

moveNumber : Position -> Int

Current move number in the game.

sideAttacksSquare : PieceColor -> Square -> Position -> Bool

Tests whether the given side attacks the given square.

isCheck : Position -> Bool

Tests whether the side to move is in check.

isCheckmate : Position -> Bool

Tests whether the side to move is checkmated.

Generating and Making Moves

moves : Position -> List Move

A list of all legal moves.

movesFrom : Square -> Position -> List Move

A list of all legal moves from the given square.

doMove : Move -> Position -> Position

Do a move on the board, returning the resulting position.

Converting to and from UCI/FEN Strings

fromFen : String -> Maybe Position

Tries to initialize a position from a FEN string. Returns Nothing on failure.

toFen : Position -> String

Converts a position to a String in FEN notation.

toUci : Position -> String

Converts a position to UCI notation, for sending it to a chess engine with a position fen <fen> moves ... command.

pilatch/elm-chess/1.0.0

Position

Types

Useful Constants

Properties of Positions

Generating and Making Moves

Converting to and from UCI/FEN Strings

Modules