As was explained in https://blog.codechef.com/2020/08/03/our-measures-against-plagiarism/, we have had a huge backlog of ratings to be penalized, and today we have done it for all users caught in contests from AUG18 to FEB20.
Appeals against these will not be entertained now, as the appeal phase for these contests is long over.
We’ll explain a few details about the process here:
- Users who haven’t been caught in plagiarism in any of these contests will not have any change in their rating (apart from the AUG20 rating update which has been done after the penalty drops)
- For others, ratings have been recalculated from AUG18, and the rating penalty has been applied at the time of the contest itself. That is, if a user has plagiarized in DEC18, then the rating penalty of 275 points is applied in DEC18 itself. This is done so as to allow genuine users who had been caught in plagiarism because of some unfortunate mistake from their part, to have the chance to gain back their ratings over time if they hadn’t cheated in more contests and had good performances in later contests.
One side effect of this being that there are some users whose final rating now is higher than what it was before the recalculation, even after the rating penalty drop. This is because of how the rating mechanism works and higher volatility has helped these fraction of users caught.
- Contests in the month of August 2018 are an exception to the above point, and their penalties are cumulatively applied in the last rated contest of that month for some users. This is due to some technical complications which we will not get into here.
Plagiarism checks and ratings drop for contests after FEB20 will be done in the coming months, and with shorter waiting time.