I did some brainstorming over this.
At first i thought its some top users with very high karma, but immediately rejected it as there are users like @kuruma with very high karma and still no such stats.
What i came up with, that there must be an @admin (The central head) and superusers working under him (like @skbly7) to assist him in forum management. And its highly possible that superuser stats is given mostly to interns or “staff” of codechef only, as the privileges could only be entrusted to some trustworthy member. (The main issue is, “What if the superuser starts to misuse his power?” That the reason why i think that superuser is given only to staff/interns).
While i dont know about if they would make anyone supersuer or not, or the criteria for it, i can only say that the admins need to be a bit more active and show/assure us that they are. The main reason malpractices occur is because those people feel that admins are inactive/wont do anything. I strongly feel that if @admin are much more prompt in assuring/showing that an action is being taken, the malpractices would reduce exponentially. The last time @admin was online was yesterday, i feel that they should atleast check/have a look at discuss once in a while.