Codeforces Community Rating

Project goals and principles

The goal is a community overwatch system for Codeforces. Cheating kills the sport when results stop feeling trustworthy.

Maintain sportsmanship among users who respect the game.
Value transparency, but do not publish details that help cheaters.
Rely on the community: experienced community members conduct reviews; users can report later evidence.

The review system ends with one of three public statuses.

Final status	Meaning
clear	Review reached clearance, so the user appears in the project ranking. Clear status can change after later cheating or missed evidence.
uncertain	Review did not clear the user. There may be cheating evidence, but reviewers did not agree enough under the rules to close the case as cheater.
cheater	The user has a project cheating finding or an external cheater database match. The user is not included in the project ranking.

Statuses are not permanent. New evidence or later review can change them.

Admins can set statuses without a review case. The decision source is public and appears in Lookup.

Clearance does not prove that a user has never cheated or will never cheat in the future.
False negatives can happen: a user who cheated may still be marked clear if review misses evidence.
False positives can happen: a user who did not cheat may still be marked cheater if evidence is misleading.

Users whose last decision was uncertain or cheater can reappeal once through Apply.

Part	What it means
status	A user's status can come from reviewer votes, an admin decision, or an outside cheater list. Handles on that outside list are not sent to reviewers.
admin decisions	Admins can grant member and reviewer rights when they have enough Codeforces community context.
review cases	Reviews cover applications, nominations, reappeals, and admin-opened cases. Reviewers get assigned sampled cases.
reports	Reports are private evidence. Report reviewers can also see reviewer-added shared evidence on assigned cases. They decide whether the target is clear, cheater, or there is not enough evidence.
after a clear report	Clearing a report is not enough by itself. The target still needs to pass eligibility before entering the ranking. Failed checks mean not eligible; external cheater database matches still mean cheater.
nominations	A nomination is support for clearance. Reviewer or admin nominations automatically cast a clear vote on the nominated case. Member nominations from non-reviewers do not cast votes. Report reviewers see the target, evidence, and shared reviewer evidence, not reporter history. More rules are on the Reporting page.

Ranking	Clear users.
Contests	Clear-user contest standings.
Community	Members, reviewers, and admins.
Nominate	Clear-support nominations for first-time review.
Uncertain	Users whose review ended without clearance and without closing as cheater.
Cheaters	Project cheating findings and external cheater database matches.
Report	Private reports from users. Report reviewers can see evidence and reviewer-added shared evidence on assigned report cases.
Lookup	Status, decision source, rating, roles, and known handles.