In addition, I would make a suggestion:
If a survey was built into the game, that would pop up and pause it whenever a host hits the quit button, that should force an agreement on all sides to any in-game quit committed by the host making it impossible for him to break the rule in rated 1v1...
Then if he would still try to simulate a computer crash perhaps the last information sent could be taken into account?
@Hannibal_Barca @user1 @FeXoR