What Is chess-analysis.org and What Can You Do on It?

chess-analysis.org is a free online chess analysis tool built on Stockfish, the open-source engine widely used for game review. You paste a PGN or import a game from Chess.com or Lichess, and the site highlights mistakes and shows better moves within seconds. It's aimed at players who want quick engine feedback on their own games without installing software or creating an account. If you need deep opening preparation, multi-game databases, or long-term progress tracking, this tool alone won't cover that.

What the site does

The core function is straightforward: take a finished game, run it through Stockfish, and turn the engine's raw evaluation into readable feedback.

• Engine analysis: Stockfish evaluates positions and suggests stronger continuations.
• Mistake detection: the site flags moves that lose material or worsen your position, so you can spot turning points without stepping through every move manually.
• Best-move review: for flagged positions, it shows what the engine preferred, which is the part that actually teaches you something.
• Import options: paste a PGN directly, or pull a game from Chess.com or Lichess.

The site states no sign-up is required to start, so you can test the workflow before deciding whether it fits your routine.

How to analyze a game

1. Get your PGN. On Chess.com or Lichess, open the finished game and copy the PGN, or use the site's import option if it connects directly to those platforms.
2. Paste or import it into the analysis input.
3. Run the analysis and wait for the engine pass to finish.
4. Review the flagged moves. For each mistake, compare your move with the engine's suggestion and ask why the alternative is better — the tactical or positional reason matters more than the evaluation number.
5. Re-check your own reasoning. If you can't explain the difference, that position is worth saving for later study.

Expected result: a move-by-move report with mistakes and best moves, generated in seconds for a typical game.

What to watch for

• Engine lines aren't explanations. Stockfish gives the move, not the idea. A move that looks odd often works for a concrete tactical reason you have to find yourself.
• Depth and speed trade off. Faster analysis may miss deeper resources; if a suggestion seems wrong, it's worth re-checking at higher depth.
• Free access vs. paid features. The site has a subscribe page and a "Buy Credits" link in its footer, so some functionality may sit behind payment. The available page information doesn't specify which features are free versus paid — check the site directly before relying on it for anything beyond basic analysis.
• No account means no history. Without sign-up, expect your analyses not to be saved between sessions.

Who it suits

The practical test is simple: import one recent loss, read the flagged mistakes, and see whether the feedback tells you something you didn't already know. If it does, the tool is doing its job.