private int blackPosition(int i) {
		int blackPos;
		switch (i) {

		case 2:
			blackPos = 1;
			break;
		case 4:
			blackPos = 2;
			break;
		case 6:
			blackPos = 3;
			break;
		case 9:
			blackPos = 5;
			break;
		case 11:
			blackPos = 6;
			break;

		default:
			blackPos = 1;
		}
		return blackPos;
	}