Chess

Build a command line chess game with object oriented programming.

This readme taken from here.

Summary

Today, let's build a command line chess game. Here's an example of the start of a game:

(Note: the ASCII art may be a little misaligned in the browser).

$ ruby chess.rb
8  ♜  ♞  ♝  ♛  ♚  ♝  ♞  ♜
7  ♟  ♟  ♟  ♟  ♟  ♟  ♟  ♟
6
5
4
3
2  ♙  ♙  ♙  ♙  ♙  ♙  ♙  ♙
1  ♖  ♘  ♗  ♕  ♔  ♗  ♘  ♖
   a  b  c  d  e  f  g  h
white's turn.
white, your move? d2
moves for white pawn d2: d3, d4
white, move d2 where? d4

Ok, white's pawn d2 to d4.

If a capture is available, the program says so when it lists the move:

8  ♜  ♞  ♝  ♛  ♚  ♝  ♞  ♜
7  ♟  ♟  ♟     ♟  ♟  ♟  ♟
6
5           ♟
4           ♙  ♙
3
2  ♙  ♙  ♙        ♙  ♙  ♙
1  ♖  ♘  ♗  ♕  ♔  ♗  ♘  ♖
   a  b  c  d  e  f  g  h
black's turn.
black, your move? d5
moves for black's pawn d5: e4
black, move d5 where? e4

Ok, black's pawn d5 captures white's pawn e4.

And on and on until:

8
7
6
5
4
3     ♚
2              ♜
1     ♔        ♘
   a  b  c  d  e  f  g  h
black's turn.
black, your piece? e2
moves for black's rook e2: a2, b2, c2, d2, f2, g2, h2, e1, e3, e4, e5, e6, e7, e8
black, move e2 where? e1

Ok, black's pawn e2 to capture white's knight e1. Checkmate.