Is it possible to become red after a Div. 2 round?

Правка en1, от okwedook, 2023-02-19 05:33:26

TLDR; Yes, it's possible, but with some comments

First of all let's look at the past. Were there people that gained rating of 2400+ after a Div. 2 round?
Turns out this already happened!

The 5 contestants that reached red after Div. 2 rounds are

But of course there is always a catch. Both demon1999 and klimmek55 were already masters when they joined the contests, so I wouldn't count that as reaching grandmaster after a Div. 2 round.

Nevertheless, what about the other three?
They had a rating lower than 2100 before the contest and 2400 or more after. Easy peasy right?

Well, unfortunately, no. As a long time member of codeforces I remember this change in codeforces rating. It states, that new users recieve an additional delta for the first 6 rated rounds they participate in. One could already guess that all the remaining participants reached red in the first 6 rounds. apei and WYZFL in 4 rounds, and afterall in 5 rounds to be exact. This basically means, that they weren't really Div. 2 participants after all, since their accumulated deltas actually make them masters.

One could ask whether it is possible even in theory. This question is hard to answer, since codeforces rating is semi-open and might have some hidden limitations. But I am optimistic in this case, and since we know one user could be worth a thousand cyans, current contests are just not large enough for people to shine. If anyone can prove/disprove this mathematically, please share your thoughts in the comments.


CSV of 10000 best new ratings after Div. 2 rounds
Теги rating, div.2, grandmaster

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en1 Английский okwedook 2023-02-19 05:33:26 2608 Initial revision (published)