Slasher1985, where did you find that information about the number of updates in the ranking each year? By the way I would be glad if you tell me which were the 13 updates the did in 1975. It´s interesting. So there was not a rule about when the ranking should be updated?..I have a little doubt. If the investigation shows a player was number one, but just in a period in the middle of two updates they did in that time(guessing those had not errors)..It would be right to add that week now?(looks like specially in 1973 that may have happened) I think it would be fair absolutely fair but I don´t know if this would break any rule.