I am 10 years here and I've been a mod but never actually thought about one thing - is trading games - by the rules?
I understand that diplomacy in game chat is allowed, but is it allowed to cross diplomacy with another game with same players?
Example: in game 1, I offer someone to suicide on the opponent so I can win and in the response I will suicide on their opponent in game 2 and therefore help them win.
Since offers are made in game chat and everyone can see them and since the same players are in both games, I don't see the legal obstruction if it is offered in both games. It may be unsportsmanlike but... I really don't know any rule which forbids such game trading.