From Lichess page 'Chess rating systems':
Question:
Which rating system is best?
Answer:
The purpose of rating systems is to predict the outcome of games. Therefore, they can be objectively better or worse, according to their ability to make such predictions. Glicko 1 makes better predictions than Elo, and Glicko 2 makes better predictions than Glicko 1
My question: Is 'predict the outcome of games' the same thing as 'reduce the number of upsets' ?
Upset here is simply lower rating defeating (or drawing against?) higher rating. Thus, assuming all ratings are integer valued and no 2 players of equal rating play against each other, what I understand is that
'1800 is more likely (or at least as likely) to beat a 1700 if the ratings are glicko 2 as compared to glicko 1'
if and only if
'Glicko 2 makes better predictions than Glicko 1'
Is there anything I misunderstood?