Does CodeChef not run MOSS properly? or they don't recalculate ratings properly?

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In the previous IICPC contest they run MOSS since it was a huge event and my rank dropped from 500s to under 100.
More than 4/5th people above me were cheaters. According to this logic after every reroll there should be massive rating change. Most of the times there is no rating change after reroll. Sometimes a +1 at max.

Either they are not doing MOSS properly (Since IICPC was a grand event it was properly done here?) or the rating recalculation is happening incorrectly.

Everyone knows there is more cheating on CodeChef than on Codeforces. Still I see significant rating change after reroll on Codeforces. Someone explain the math.

4 Likes
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@justani @emperor100

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Most of the affected accounts I believe were from division 4. In division 2 only 25-30 contestants were affected

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Are you sure your ranked dropped from 500 to 100 in division 1? We did not catch those many cheaters in division 1 at all.

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And you guys gave me cheat instead of giving to a scammer, my rating decreased directly from 5 star to 3 star :confounded:

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Really need this…
Codechef do somthing about it otherwise codechef will totally loose it’s credablity in near future

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@emperor100 please brother so something, i have never gained a plus 1 after rating recalculation please take it seriously and do it in best way possible

1 Like
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“Yes, CodeChef is not working correctly. They often flag plagiarism incorrectly, affecting genuine users. This issue needs to be addressed properly.”

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@justani @emperor100

yeah I was talking about my overall iicpc rank.
Even if you only consider div1, You can’t deny that CodeChef cheating is WAY worse than Codeforces still I don’t remember getting any delta from some rollback.

You should start manual checking like CodeForces.
In IICPC after MOSS my overall rank was 200. Then they did manual checking and my rank got to 75. It means MOSS Is not that effective right. And the people who have managed to get to Div1 have probably found ways to avoid MOSS that’s why I hardly get any rollback delta in Div1.

Manual Checking might sound like too much work but it should at least be done in Div. 1 if you want to maintain crediblity of platform rating. It would hardly take 1 hour to go through every Div1 top ranker.