I see that discussion has “opened” (solutions posted to some of the problems) for this years USAMTS round 2 as the due date was November 28th. Close the discussion as soon as possible. Although the due date is November 28th, discussion is not permitted until a few days later. People can still technically ask for an extension that can last up to 24 hours, so some people may have not yet submitted. I regret forgetting to mention this in my last post, but discussion of problems is only allowed when it’s allowed on AoPS. It’s generally safe to discuss at ~12 AM GMT 2 days after the due date. In the case of this round, discussion should be safe on November 30th at 4 PM PST/7 PM EST if you live in the US.