YOUR NEXT MOVE: KNOW MORE
Brilliant play.
Or something else?
That game felt a little too perfect. Check completed Chess.com or Lichess games for engine-like play, with move-by-move analysis and evidence behind each score.
2 free scans every week · No sign-up required
Brilliant play. Or something else?That game felt a little too perfect. Take a closer look.
START YOUR ANALYSIS
Let’s look at that game.
Public games only. No account connection or password needed.
Suspicion scores out of 100, not probabilities or proof of cheating. Select a game to see the evidence.
Your recent games
Example scan. This is a simulated game: White's moves were picked by an engine, Black's were not.
Engine match timeline
Taller bars are closer to the engine's top move. Colour shows how common the move is at that player's rating. Select a bar to see the position.
How the numbers are worked out
- Engine: Stockfish, its top five lines for every position. A played move outside the top five gets its own search.
- Moves scored: each player's first four moves and forced moves (only one legal move) are left out.
- Top engine choice and Engine top 3: share of scored moves that were the engine's first pick, or among its first three.
- Top choice when critical: the same, counting only positions where the second-best move is at least 50 centipawns worse than the best.
- Average centipawn loss: average evaluation given up against the engine's best move, with evaluations capped at 10 pawns either way.
- Mistakes: share of scored moves losing more than 100 centipawns.
- Suspicion score: a statistical formula. It measures how far the four rates above sit from what an honest player at that rating typically produces, weighted by how many moves were scored. Low is under 30, Moderate 30 to 49, Elevated 50 to 69, High 70 and up.
- Timeline colours: an estimate of how often a player at that rating finds the move, based on rating, whether it is a capture, recapture or check, how many legal moves there were, and how far the best move stands out.
A score is a statistical anomaly, not proof of cheating. Strong players in simple games, and short games, can score high without any help. One game is weak evidence. Do not accuse anyone on the strength of one scan.
Your scans
PRIVATE
Scan activity
All saved scans, including guest and batch scans. Newest first. Times are shown in your time zone. Deleted scans and the homepage example are excluded.
| White | Black | Submitted | Status |
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FROM INSTINCT TO EVIDENCE
Three steps. A clearer picture.
Bring your game
A Chess.com or Lichess link, or the PGN from any site or tournament. Ratings are read from the game, or you can enter them.
Stockfish checks every move
Each position gets a fresh engine search. The move played is compared with the engine's top five and with what players at that rating usually find.
Read the report
A suspicion score for each player, six engine-match statistics, a move-by-move timeline, and a board showing what was played against what the engine wanted.
What a score cannot tell you
Engine-like play and engine use are different things. Strong players match the engine often, short tactical games are easy to play accurately, and one game is a small sample. Use a scan to decide whether a game deserves a closer look or a report to the site's fair-play team, who see far more than a single game.
Plans and pricing
Free
$0
- 2 scans a week
- Full report for both players
- A link to share each scan
Pro
Billed $5 monthly. Renews until canceled.
- Unlimited scans, up to 100 a day
- Scan your latest 5, 10, or 20 games together
- Saved scores beside your recent games
- Everything in Free
- Cancel any time
Subscriptions open soon.
Chess analysis guides
Wondering whether your opponent cheated? Learn what a chess cheat checker can tell you, what a high accuracy score means, and how to review the evidence without jumping to conclusions.
Can ChessCheatScan prove cheating?
No. Its suspicion scores describe engine-like play under a statistical model. They are not probabilities of cheating. Read the methodology and limitations.
Is it free to try?
Yes. You can scan two games per rolling seven days without an account, subject to a shared-network limit. Pro costs $5 per month and adds batches of 5, 10, or 20 games, up to 100 scans a day.
Do I need my chess account password?
No. Username lookup uses public, completed games from Chess.com or Lichess. You can also paste a PGN or game link.