boolean digLegal (int col, int row) {
		int rowNumber = 0;
		int colNumber = 0;
		for (int i = 0; i<9; i++) {
			if (board.getNumber(i, row)!=0) {
				rowNumber++;
			}
		}
		for (int j = 0; j<9; j++) {
			if (board.getNumber(col, j)!=0) {
				colNumber++;
			}
		}
		if(rowNumber==minRowCol||colNumber==minRowCol) {
			return false;
		}
		return true;
	}