Chess

This is a final project for The Odin Project. Its a command-line chess clone written in TDD.

The game follows all of the rules of chess.

To play the game run bin/chess.rb from the root directory. You can also run the test suite with rake from the same root directory.

Chessboard

The game is played on a standard 8 by 8 chessboard. The initial chessboard is shown below:

 A B C D E F G H
8♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜ 8
7♟ ♟ ♟ ♟ ♟ ♟ ♟ ♟ 7
6                6
5                5
4                4
3                3
2♙ ♙ ♙ ♙ ♙ ♙ ♙ ♙ 2
1♖ ♘ ♗ ♕ ♔ ♗ ♘ ♖ 1
 A B C D E F G H

The letters (A - H) and number (1 - 8) around the board are used to specify desired game moves.

Game Moves

A move is entered as two positions separated by something or not. The following are valid ways to move a white pawn on the first game move:

• A2 A3
• a2 a3
• A2 to A3
• A2, A3
• A2A3

Illegal moves

The game is designed to detect invalid moves. When a move is not valid the player will be asked to type another move.

After two valid board positions are detected, further checks are made.

Special moves

All special moves in a chess game (castling, en passant, promotion, and a pawn's double step on its first move) are recognized and allowed during game play.

Game Play

Game play alternates between two players as one would expect with only valid moves being allowed. Play continues until one of the kings is in checkmate.

Game Saves

A player may save or load a game by typing save or load instead of moves.