Rules for organizing, conducting, and participating in online Heroes of Might and Magic III tournaments.

Is it only possible to start counting from this year? Otherwise, the question arises as to how deeply to delve into other resources?

Not that many tournaments have taken place. Many have, but not as many as Best, PL, and RP. On HW, it's the first, on HP, it's the second, and there were 4 on Bay. So, a total of 7.
Although, it seems to me that each resource should primarily value its own "bests" and then look at the other two.
You could take the 7 "bests," sum up the points.