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I watched a really interesting talk about how XBox (and presumably the Xbox One) uses a technology they call TrueRank to do player matching. As far as I know this was an MSR project to create a Bayesian version of the ELO chess ranking system. Actually, now that I think of it, it was a whole week of ML talks by academics from MSR.

My point being, they produce (and ship) a lot of smaller innovations too, behind the scenes. Sometimes it's just detecting griefers.

Yep, I heard about that too. It wasn't just detecting griefers, it was a whole matching system to make sure new players didn't get frustrated while experienced players were still challenged.

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