I used Axum for the websocket server, MySQL for the database, and the glicko2 crate for elo management. Those are the only 3 that come to mind, I didn't use any libraries/engines for the game itself.
That's kind of funny. When this project said it had elo rankings, I had the thought, "it's a shame they're using elo when there are better options." It seems like you are already using one of those better options!
Other than where elo is used for historical reasons, about the only other reason I can think to use it in a new project is as a placeholder until you do something better. It's great as a placeholder since it is so easy to implement.
That's kind of funny. When this project said it had elo rankings, I had the thought, "it's a shame they're using elo when there are better options." It seems like you are already using one of those better options!
Other than where elo is used for historical reasons, about the only other reason I can think to use it in a new project is as a placeholder until you do something better. It's great as a placeholder since it is so easy to implement.