duff / chess

Chess

An Elixir chess library that knows about games, moves, boards, and pieces.

Installation

This library is not yet available on Hex. For now, it can be installed by adding chess to your list of dependencies in mix.exs:

def deps do
  [
    {:chess, github: "duff/chess"}
  ]
end

Usage

iex> alias Chess.Game

iex> game = Game.new()
iex> {:ok, game} = Game.add_player(game, "user_1", :white)
iex> {:ok, game} = Game.add_player(game, "user_2", :black)
iex> {:ok, game} = Game.move(game, "user_1", :e2, :e4)
iex> {:ok, game} = Game.move(game, "user_2", :b7, :b6)
iex> game

#Chess.Game<
  black: "user_2",
  board:
  +--------------------------+
8 |  r  n  b  q  k  b  n  r  |
7 |  p  .  p  p  p  p  p  p  |
6 |  .  p  .  .  .  .  .  .  |
5 |  .  .  .  .  .  .  .  .  |
4 |  .  .  .  .  P  .  .  .  |
3 |  .  .  .  .  .  .  .  .  |
2 |  P  P  P  P  .  P  P  P  |
1 |  R  N  B  Q  K  B  N  R  |
  +--------------------------+
     a  b  c  d  e  f  g  h
,
  id: nil,
  rules: %Chess.Rules{state: :white_turn},
  status: {:in_progress},
  white: "user_1",
  ...
>

iex> Game.move(game, "user_1", :b7, :b6)
{:error, "There is no piece at that position."}

iex> Game.move(game, "user_1", :e4, :b6)
{:error, "That is not a legal move."}