public void promote( )
	{
		//promotes player2's pieces
		for( int column = 1 ; column < MAX_COLUMNS ; column += 2 )
		{
			if( board[ 0 ][ column ] != null && board[ 0 ][ column ].toString().equals( Checker.TWO.toString() ) )
			{
				board[ 0 ][ column ] = Checker.TWO_KING;
			}
		}
			
		//promotes player1's pieces
		for( int column = 0 ; column < MAX_COLUMNS ; column += 2 )
		{
			if( board[ 7 ][ column ] != null && board[ 7 ][ column ].toString().equals( Checker.ONE.toString() ) )
			{
				board[ 7 ][ column ] = Checker.ONE_KING;
			}
		}
	}