As most people know, in yesterday’s round Codeforces Round 852 (Div. 2), problem F coincided with a previous problem on Codeforces. A few months ago, a similar thing happened to Codeforces Round 810 (Div. 1), which also had an issue of coincided problems.
Of course, we know what happened next: Codeforces Round 810 (Div. 1) was unrated for div.1, while as it stands, this round will be rated as per Mike’s latest blog post. I won’t elaborate more on that blog post; I assume you are familiar with Mike’s rationale.
I mulled over that decision for a while, and I’d like to raise a few points.