Fred wasn't in a mood to answer academic questions but he could at least give it a try since he was there. It couldn't hurt anyway. "The difference between the Challenges and the Pinnacles is that in the Pinnacles calculation you addition your two numbers but you substract them in the Challenges. As for the similarity the first Challenge and the first Pinnacles uses the same number which are the day of birth and the month of birth. So basically the first, second, third and fourth for each calculation for both uses exactly the similar numbers. Perhaps not in the same order...."