BDOHContests
Timed contests written by past medallists, run just like the real olympiad. Join live, review your answers after the close, and watch your rating move.
How contests work
Timed, one sitting
The timer starts when you enter. Your answers save as you go, and the paper submits itself when time runs out.
Fair play
Stay on the contest tab. Switching away is counted, and too many switches end your attempt.
Results and rating
Scores are checked after the close. Ranked results and worked answers appear on the leaderboard.