Recognizing rated vs. unrated games

Sorry for posting this a second time, but I'm hoping reaching out to a larger audience might produce an answer this time. When viewing games in progress tournament games are easy to spot but how does one distinguish an unrated invitation game from a rated “waiting room” game?

One way would be by the message sent by the system at the end of the game.

That's a good point. But how about games in progress or games that I did not play?

@Marley: The question is about "viewing games in progress"

Well, I missed the "in progress" phrase. I'd seen the question posed elsewhere and just thought I'd note what seems, based on posts to date, to be the only known method.