No. A high accuracy score on its own is not proof of cheating. It describes aspects of the moves played, not how the player found them.
Why an honest game can look extremely accurate
- Forced play: checks, recaptures, and a single legal move can leave little room for choice.
- A short game: a handful of good decisions is a much smaller sample than a long, complicated game.
- Familiar positions: opening preparation and recognizable tactical patterns can make strong moves easier.
- A losing opponent: after a major mistake, converting the advantage may involve straightforward moves.
Consider a short game where one player hangs a queen and then resigns. The winner may have made almost no consequential mistakes. That does not make the game evidence of outside help. Conversely, occasional engine use may be hidden among otherwise ordinary moves, so an unremarkable accuracy score is not a guarantee of fair play.
Accuracy, engine agreement, and suspicion are different numbers
Chess.com's Accuracy score, the percentage of moves matching an engine's top choice, and ChessCheatScan's suspicion score are different measurements. Do not treat them as interchangeable. Our suspicion score combines several signals using a statistical formula; it is not Chess.com's CAPS2 score and is not a probability that a player cheated.
There is no universal accuracy cutoff that reliably separates honest players from cheaters. Chess.com explicitly notes that high accuracy can happen for reasons unrelated to cheating.
A more useful way to review your game
Look at the difficult positions, not just the average. Ask whether alternatives were close in strength, whether the move was forcing, and whether there were enough meaningful decisions to support any conclusion. Analyze a finished game to inspect both players' moves and engine comparisons.
What if the suspicion score is high too?
Treat that as a reason to inspect the evidence, not as a verdict. Our formula uses assumed rating baselines and can produce false positives. It has not been validated to establish a real-world cheating detection rate. See how the scoring works and its limitations.
Sources: Chess.com: fair play and Chess.com: how Accuracy is determined.