As said in 'terms and conditions', 'The best entry of each team will be public in the leaderboard at all time.' Please make your best result public instead of hiding it.
We have scheduled a important maintenance operation for the Codalab public instance (http://competitions.codalab.org) for Saturday, September 8th.
The migration will start at approximately 9AM PST and should hopefully be completed by approximately 1PM PST that same day.
During that time the server will be down.