Qi.cr

Qi (棋) is an abstraction for initializing and updating positions of chess variants (including Chess, Janggi, Markruk, Shogi, Xiangqi).

Installation

1. Add the dependency to your shard.yml:

   dependencies:
     qi:
       github: sashite/qi.cr

2. Run shards install

Example

require "qi"

in_hand = %w()

square = {
   0 => "l",
   1 => "n",
   2 => "s",
   3 => "g",
   4 => "k",
   5 => "g",
   6 => "s",
   7 => "n",
   8 => "l",
  10 => "r",
  16 => "b",
  18 => "p",
  19 => "p",
  20 => "p",
  21 => "p",
  22 => "p",
  23 => "p",
  24 => "p",
  25 => "p",
  26 => "p",
  54 => "P",
  55 => "P",
  56 => "P",
  57 => "P",
  58 => "P",
  59 => "P",
  60 => "P",
  61 => "P",
  62 => "P",
  64 => "B",
  70 => "R",
  72 => "L",
  73 => "N",
  74 => "S",
  75 => "G",
  76 => "K",
  77 => "G",
  78 => "S",
  79 => "N",
  80 => "L",
}

starting_position_piece_set = {in_hand: in_hand, square: square}

moves = [
  [56, 47, "P"],
  [3, 11, "g", nil],
  [64, 24, "+B", "P"],
  [5, 14, "g", nil],
  [24, 14, "+B", "G"],
  [4, 3, "k", nil],
  [nil, 13, "G", nil],
]

last_piece_set =
  moves.reduce(starting_position_piece_set) do |piece_set, move|
    Qi.call(move, **piece_set)
  end

last_piece_set # => {in_hand: ["P"], square: {0 => "l", 1 => "n", 2 => "s", 6 => "s", 7 => "n", 8 => "l", 10 => "r", 16 => "b", 18 => "p", 19 => "p", 20 => "p", 21 => "p", 22 => "p", 23 => "p", 25 => "p", 26 => "p", 54 => "P", 55 => "P", 57 => "P", 58 => "P", 59 => "P", 60 => "P", 61 => "P", 62 => "P", 70 => "R", 72 => "L", 73 => "N", 74 => "S", 75 => "G", 76 => "K", 77 => "G", 78 => "S", 79 => "N", 80 => "L", 47 => "P", 11 => "g", 14 => "+B", 3 => "k", 13 => "G"}}

License

The code is available as open source under the terms of the MIT License.

About Sashite

This library is maintained by Sashite.

With some lines of code, let's share the beauty of Chinese, Japanese and Western cultures through the game of chess!