I have a question about drawn games and Elo rating change. Some time ago, I played a game that ended in a draw (link). According to the info from the result section: "the winning percetange for a player is 80% (or 20%), which results in the Elo change of -+6.09". However, our ratings remained unchanged.
As I'm a relatively new user here, I'm not really sure how the draws are treated in this particular game, but anyway, there is contradictory information in the result section then. I've reported it as a bug (link) but I doubt whether it would be reviewed anytime soon unless it's upvoted.
Can someone explain why it is so?