One more thought, totally different direction: one single rank which is impacted more by the category of game you play more often. So if I play an occasional blitz and usually play standard live games, my rank is hardly affected by each blitz game when compared to a single standard live game. If I play a lot of blitz, the occasional long drawn out game doesn’t impact my rank nearly as much as my next blitz game will. But I’d still want a seperate rank just for correspondence games under this, I think, maybe.