Game

The Game type and related functions.

At the moment, a game is little more than a sequence of moves, and a current position. There is no support for annotation in the form of comments or variations. Support for tree-like games with recursive variations and comments are planned for a future version of this library.

Types

type Game

Type representing a chess game.

Constants

empty : Game

A new game starting from the standard opening position.

Converting Games to and from PGN

fromPgn : String -> Maybe Game

Tries to create a Game from a PGN string. Returns Nothing if PGN parsing fails, or if there are illegal or ambiguous moves.

toPgn : Game -> String

Converts a game to a string in PGN format.

Getting the Current Position

position : Game -> Position

The current position in the game.

Getting Game Moves

moves : Game -> List Move

List of all moves in the game.

previousMove : Game -> Maybe Move

The previous move in the game, i.e. the move that resulted in the current game position. Returns Nothing if we're at the beginning of the game.

nextMove : Game -> Maybe Move

The next move in the game from the current position. Returns Nothing if we're at the end of the game.

Navigating in the Game.

goToMove : Int -> Game -> Game

Jump to the given game ply number. If the ply is less than 0, goes to the beginning of the game. If the ply is bigger than the length of the game, goes to the end of the game.

forward : Game -> Game

Step one move forward, unless we are already at the end of the game. If we are already at the end, do nothing.

back : Game -> Game

Step one move backward, unless we are already at the beginning of the game. If we are already at the beginning, do nothing.

toBeginning : Game -> Game

Go to the beginning of the game.

toEnd : Game -> Game

Go to the end of the game.

isAtBeginning : Game -> Bool

Are we at the beginning of the game?

isAtEnd : Game -> Bool

Are we at the beginning of the game?