How to Analyze a Chess Game on chess-analysis.org

Updated

Paste a PGN, import a game from Chess.com or Lichess, and the site runs Stockfish to flag mistakes and show better moves — no account needed. This works for any finished game you have a PGN for, or any public game from those two platforms. You'll need the PGN text or a game link, and a browser.

Before You Start

  • A finished game in PGN format, or a link to a public Chess.com / Lichess game. If you played elsewhere, export the PGN from that app first.
  • The result you want: a move-by-move review with engine evaluations, mistakes highlighted, and best-move suggestions.
  • No sign-up is required to run an analysis. The site does have a subscribe page and a "Buy Credits" link, so treat heavy or repeated use as something that may involve paid credits rather than assuming unlimited free runs.

Step 1: Get Your Game In

You have two routes, and they take different inputs.

Route A — Paste PGN text

  1. Copy the full PGN of your game, including the move list and headers like [White "..."], [Black "..."].
  2. Paste it into the analysis input on the site.
  3. Submit it to start the analysis.

Expected result: the site parses the moves and loads the position sequence for the engine to walk through.

Route B — Import from Chess.com or Lichess

  1. Open the game on Chess.com or Lichess and copy its URL (or use the site's import field for that platform).
  2. Provide the game link to chess-analysis.org.
  3. Let it pull the moves in.

Expected result: the game loads the same way a pasted PGN would, without you exporting anything manually.

Common snag: if the import fails, the game is usually private or the link is wrong. Fall back to exporting the PGN and pasting it.

Step 2: Run the Stockfish Analysis

Once the game is loaded, start the analysis. Stockfish evaluates each position and produces an evaluation for every move.

What you're looking at:

Output What it tells you
Move evaluations How the position's assessment changed after each move
Mistakes / blunders Moves where the evaluation dropped sharply
Best move suggestions The engine's preferred move in that position

Expected result: a reviewed game where the costly moves are marked and you can step through them.

Step 3: Read the Results

Don't just look at which moves were flagged — look at why.

  1. Jump to each flagged mistake and compare your move with the suggested best move.
  2. Check the evaluation before and after: a small drop is a positional slip, a large one is usually a tactical error (a hanging piece, a missed capture, a bad trade).
  3. Step one move earlier. Many "blunders" are actually the consequence of a weaker move played before it — that's often the more useful lesson.

Common snag: engine lines can look strange in quiet positions. If the suggested move seems pointless, it's usually about long-term structure rather than an immediate threat — don't over-trust a single number in a balanced position.

What You Get and What to Watch For

  • Free to use without signing up for a normal analysis session.
  • Credits and a subscription exist on the site, so if you plan to analyze many games, check the current terms on the subscribe page before relying on unlimited access.
  • Engine output is a tool, not a verdict. Use it to find candidate mistakes, then reason about the position yourself — that's where the improvement comes from.

If you just want a quick answer to "where did I go wrong," paste the PGN, run the analysis, and read the flagged moves in order. If you want to actually improve, spend the time on the move before each mistake.