Chess game analysis with Stockfish 18
Roque analyzes your chess games move by move with Stockfish 18. Import a game from Chess.com, Lichess or a PGN file and get a clear report: your accuracy, every move classified from brilliant to blunder, the moments that decided the game and the lines you could have played instead.
Stockfish 18 analysis
The two best lines for every position after the opening book, with a deeper check of critical moments.
Move classification
From best move to blunder: accuracy, ACPL, key moments and automatically generated comments.
Personal library
Import from Chess.com, Lichess or a PGN. Find, tag and compare all your analyses.
How the analysis works
- 1
Import your games
Link your Chess.com username, connect your Lichess account through the official Lichess authorization, drop PGN files (multi-game files are supported), paste a PGN or fetch a game from its URL.
- 2
Pick an analysis profile
Choose how deep Stockfish should look. The analysis runs on our servers in the background, so your device does none of the work and you can follow the progress live.
- 3
Review the game
Step through the moves on an interactive board with an evaluation bar and an evaluation chart, read the automatic comments and play the engine's best lines on the board.
What every analysis gives you
Accuracy and ACPL
An accuracy score for each player, computed with the method published by Lichess, plus the average centipawn loss (ACPL).
Move classification
Every move gets a label, from brilliant (a sound sacrifice that is also the best move) to blunder, with opening book moves and forced moves recognized as such.
Key moments
The decisive moments where a player's winning chances dropped the most, and the big evaluation swings of the game. Click the chart to jump to any position.
Best lines
Stockfish's two best lines for each position after the opening book, which you can play on the board. Critical moments get a deeper check, with up to three candidate lines on critical positions with the Deep profile.
Game report
An estimated Elo performance for the game, your strengths and what to improve, opening and endgame phases, and the distribution of your moves.
Automatic comments
Plain-language comments on the important moves, generated from the engine's data: what was lost, which move was better, and missed or allowed mates.
Explore and practice
Explore any position with live engine analysis, build a variation tree, or play the position out against Stockfish at the strength you choose.
Your library
All your games and analyses in one place: search by player, opening or title, add tags and favorites, and come back to any game later.
Move classifications used in the report
- Brilliant move
- Great move
- Best move
- Excellent
- Good move
- Book move
- Forced move
- Missed opportunity
- Inaccuracy
- Mistake
- Blunder
Frequently asked questions
- Is Roque's chess game analysis free?
- Yes. Creating an account and analyzing your games is free. To keep the servers fair for everyone, there is a daily analysis limit, and the Deep profile has its own 24-hour quota.
- Which chess engine does Roque use?
- Roque uses Stockfish 18, the open-source engine released under the GPLv3 license. It runs on our servers, not in your browser.
- Can I analyze my Chess.com and Lichess games?
- Yes. For Chess.com, enter your username: Chess.com offers no OAuth, so Roque checks that the account exists and fetches your public games. For Lichess, you connect through the official Lichess authorization — no password, and it cannot play games or change your account. You can also import any PGN.
- How is accuracy calculated?
- Each move is scored by how much it lowers your winning chances according to Stockfish, then the scores are combined into a game accuracy, following the method published by Lichess. ACPL is shown alongside it.
- Do I need an account?
- Yes. An account keeps your imported games and finished analyses in your personal library, so you can review them at any time.
Analyze your next game
Import a game from Chess.com, Lichess or a PGN file and get a complete Stockfish report.