How does "True Skill" work?

I was wondering how VainSocial’s true skill system was calculated since they don’t explain it in details. Can anyone enlighten me?
Also I’m sorry if I’m posting this in the wrong category :ozo:

In case you don’t know what I’m talking about : https://vainsocial.com/leaderboards/true-skill/eu

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There are some details in this thread: Vainsocial stats meaning?

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