Originally Posted by Chuck Kennedy
A propagator dropping out completely or tanking their round will not affect the ratings calculation for others. If a propagator shoots more than 60 points below their rating, they are not used to determine the course rating for that round.
Right. So someone is having a bad round, say almost 60 points below their rating and they don't turn in their card.
Instead of that low rating counting toward the ratings calculation it is dropped due to not turning in the card. It would be a tiny difference in the ratings for that tournament, but could be noticeable if there were few enough players.