Let's look at how the new team Elo calculation works, and what was wrong with the old calculation. It wasn't as bad as you might think, but it had a fatal flaw.
0:15 How bad was the Elo inflation before the change?
0:40 Crash course in Elo ratings
2:52 My rationale for the old calculation
4:30 The mechanics of the old calculation
6:40 What's the fix?
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Game: Age of Empires II Definitive Edition