Hello. I was playing on the server and even though I did not lose any game for the last 5 games, yesterday my rank decreased from 11.2 to 11.9. Moreover, my last game did not increase my rank at all even though it was a ranked match. Can you help me understand what is going on?
The glicko system OGS uses is not a straight +x for win -x for losses.
I forget the number, but it tracks the last N number of games/opponents. Each opponent is also ranked by this criteria.
This means that you beat someone and rank up based on their strength. However, if it turns out a few games later that they were not as strong as though, then the win was not worth as much as thought.
So basically someone you played lost a bit of rank shortly after losing to you, and the system adjusted the points you got for beating them because they turned out to not be as strong.
That’s really interesting. I think I understood. Thank you very much for your reply.