public PositionEntity(final char aCol, final char aRow) {
		char c1 = aCol;
		char c2 = aRow;
		x = -1;
		y = -1;
		if ('1' == c1)
			x = 8;
		else if ('2' == c1)
			x = 7;
		else if ('3' == c1)
			x = 6;
		else if ('4' == c1)
			x = 5;
		else if ('5' == c1)
			x = 4;
		else if ('6' == c1)
			x = 3;
		else if ('7' == c1)
			x = 2;
		else if ('8' == c1)
			x = 1;
		else if ('9' == c1)
			x = 0;
		if ('A' == c2)
			y = 0;
		else if ('B' == c2)
			y = 1;
		else if ('C' == c2)
			y = 2;
		else if ('D' == c2)
			y = 3;
		else if ('E' == c2)
			y = 4;
		else if ('F' == c2)
			y = 5;
		else if ('G' == c2)
			y = 6;
		else if ('H' == c2)
			y = 7;
		else if ('I' == c2)
			y = 8;
	}