Hello. It's possible (and even happened with some players) to gain your rank unfairly this way:
1. Create two (or more) accounts A and B
2. Play each account separately against other players until both accounts have pretty much ranking points
3. Choose an empty server and play A vs B, make A win and B lose much time/quit
4. Now A has bigger rating!
My calculations tell that it's possible to gain roughly 400 points in an hour provided that both accounts had equal ratings before. This is unfair because equal ratings should mean equal chance to win, and for most players it's impossible to constantly win against rivals with similar rating. Any thoughts how to prevent this?