https://lichess.org/page/rating-systems https://lichess.org/page/rating-systems Yes, ratings can't be compared between different pools. Different rating system

https://lichess.org/page/rating-systems https://lichess.org/page/rating-systems Yes, ratings can't be compared between different pools. Different rating systems can perform with different accuracy, though: Which rating system is best? The purpose of rating systems is to predict the outcome of games. Therefore, they can be objectively better or worse, according to their ability to make such predictions. Glicko 1 makes better predictions than Elo, and Glicko 2 makes better predictions than Glicko 1