so i've updated the site with a new rating system for problem solvers: you start at 30 kyu, and work your way up as high as you can by solving new problems. i think this should be fun as well as educational.

let me know how this feels for people -- and if the ratings seem appropriate for the difficulty of the problems.

note: your old rating graphs were based on a different starting point. they now start at 30 kyu.

(this is using the Elo rating system for both problems and users.)