Hello,

I am trying to use glicko 2 rating system in my game. I have implemented it using the formulas described in the document. However I am not sure I understand correctly how the rating deviation *φ* of a player is increased after periods of inactivity. The document mentions that when a player does not compete during a "rating period" the deviation *φ* is updated using this formula:

φ = sqrt(φ^2 + σ^2) (could not embed the formula, it seems that image extensions has been disabled)

where *σ* is rating volatility.

But using that formula it seems that *φ* is increased in a very slow rate. For example if a "rating period" is one month and a player has *φ = 50* and *σ = 0.06*(the recommended value for volatility), after 10 years(120 "rating periods") of inactivity *φ' = 50.004189*. Is that the expected behavior or I am missing something? Is there any way to adjust how "quickly" *φ* is increased during player inactivity?

Let's hope that there is someone that has used this algorithm in the forums.

Thanks in advance!