TrueSkill (as tuned for some Halo games?) has the unfortunate property of player ratings becoming essentially immutable after a player plays a large number of games. This is alright as long as you can guarantee players won&#x27;t get better or worse at your game over time. Elo-like systems and the TopCoder rating system do more to allow for players changing dramatically in skill level over time.<p>TFA doesn&#x27;t mention how victory works in Terra Mystica. Can all players win? Can 2 out of 5 players win? Who knows.<p>Edit: It looks like TM is a point-scoring game? So you are rated in 1v1 matches against each other player based on how many points you got. Can you tie?<p>Edit again: Yes, you can tie, but it&#x27;s unusual enough to not matter much. Good thing this isn&#x27;t chess!<p>I&#x27;d be interested in seeing these systems generalized to a game like Shadow Hunters, where there are 2 teams with shared win conditions, some other 1-person sides with their own win conditions, and winning doesn&#x27;t necessarily mean other people lose.<p>One asymmetric board game site gives each player a separate rating for each side. So you can be 2500 with Zane but 1500 with Troq in Yomi or something. This works pretty well for games with a small number of sides, like 14 or 20 or 70. It becomes pretty useless if you try to generalize it to a game with 10^3572835 sides like Hearthstone though...