Rank decrease after win

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.

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That’s really interesting. I think I understood. Thank you very much for your reply.

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