Possible classes:
	GUI
		Display the game board
		Show the selected first half of the move
		Show the list of moves that are performed so far
		Show the captured pieces
		Show highlighting for the most recent move
	GameBoard
		Direct storage of piece data in a 2D array (speed of computation)
		Knowledge of whether or not castling, en passant are available
		Be able to set up the starting positions
		Perform the move (remove piece if a capture, promote to queen if get to the end)
	Piece (subclasses?)
		Symbol
		Position (else captured)
	Player
		Enacts moves on the GameBoard

Where are the rules going to be programmed in?
	A piece has to be aware of other stuff going on around it in order to calculate if a move is legal or not.

What is a piece location useful for?
	Checking for legality of moves
	Drawing the pieces on the board

Duplicating game states will be easier if we don't have lots of objects attached to the game board.