So it&#x27;s definitely true that players will have different skill levels with different factions. But even with 20 factions I&#x27;d be worried about getting enough data on for individual player&#x2F;faction combinations to converge to the real values. That&#x27;s especially true if the game doesn&#x27;t allow a player to specialize in just a couple of factions, but realistically will be playing 10+ different ones. Maybe the thing to do would be to have three components instead of the current two; generic player skill, faction power, and faction-specific player skill.<p>One thing I do is track how much games with each faction contributed to each player&#x27;s rating. But that&#x27;s just for amusement value, there&#x27;s no feedback from these faction breakdowns to the ratings as a whole.