Recently, the NAF implemented a new rating system alongside their old Elo system. The stats nerd in me immediately got excited because the new approach uses the Glicko system (excellent introduction to the implementation here) which uses both a player’s estimated ability as well as a measure of how uncertain that estimate is. This should allow us to do a few interesting things beyond a basic leaderbaord. Seeing that all the code was available and that it stores historical ratings along with the current snapshot (now removed from the repo because it’s a large file but still accessible if you know where to look) I decided to have a play around and see if we can visualise them.