Cheater Tax
How much rating did cheaters take from you?
Enter your username. Your browser looks up every opponent you faced in the period you pick on Chess.com or Lichess, finds the ones later banned for fair-play violations, and adds up the rating you lost in those games. Free, no signup.
Did I play a cheater? Questions and answers
How do I check if I played a cheater on Chess.com or Lichess?
Enter your Chess.com or Lichess username above and pick how far back to look. The check lists how many of your opponents were later banned for cheating, how many games you played them and how much rating those games cost you.
How is the rating loss counted?
We add up your rating change in every game against an opponent whose account was later banned. Lichess reports the change for each game. Chess.com does not, so we estimate it from your rating before and after the game, and mark those figures with ≈. The total is measured at the time of each game, before any rating the platform gave back after a ban. Read it as what those games cost you, not as proof that every point was taken unfairly.
How does the check work?
Your browser reads your public games from Chess.com and Lichess, lists every opponent you faced and looks up each account. Chess.com marks accounts it closed for fair-play violations; Lichess flags accounts that broke its terms of service, for computer assistance or rating manipulation. The platforms answer your browser directly.
Does a banned opponent mean they cheated against me?
Not necessarily in your game. A ban shows the platform found fair-play violations on that account, usually weeks or months after the games, and it does not say which games were affected. Treat the list as a pointer, not as proof about any single game.
Does a clean result mean I never played a cheater?
No. Platforms catch only part of the cheating that happens, and some accounts are never banned. A clean result means none of your opponents has been banned so far.
What do closed and not found mean?
Closed means the platform shut the account for a reason it does not make public. It is often unrelated to fair play, so closures are counted apart from bans. Not found means the account no longer exists under that name, for example after a deletion or a rename.
How long does it take, and can I stop it?
The 3-month default is quick; a long history takes longer, because both sites limit how fast games can be read. You can stop at any time and keep what was checked so far.