ChessAnalyzer

ChessAnalyzer — Free Chess Analysis and Training for Chess.com and Lichess Players

ChessAnalyzer is a free web app that reviews your chess games with Stockfish, explains what went wrong in plain language, and turns your mistakes into training. Paste a PGN, drop a Chess.com or Lichess game link, or just enter a username — no signup, no install, no paywall.

## How It Works

1. Import a game — enter your Chess.com or Lichess username, paste a game URL, or load a PGN.

2. Get an instant review — Stockfish evaluates every move and grades your whole game.

3. Walk through it with your coach — a guided, spoken review of the moments that decided the game.

## Full Game Review, Powered by Real Stockfish

Every finished game gets a complete engine breakdown:

- Accuracy scores for both players, with average loss in centipawns, so you can compare performance at a glance.

- Every move graded — Masterstroke, Best, Strong, Solid, Theory, Inaccuracy, Mistake, Missed Win, or Blunder.

- Best-move suggestions with eval bars, so you always see what the engine preferred.

- A momentum graph of the whole game — click any point to jump straight to the critical moment.

- Deeper analysis on demand — found an interesting position? Ask the engine to look deeper right there in the review.

## Meet Rook, Your Personal Coach

Numbers tell you what happened. Rook tells you why.

- Guided key moments — after the review, Rook picks the moves that made the difference and walks you through them one by one.

- Plain-language explanations — "Nf6 is a mistake: the knight on f6 now supports the pawn on h7. Your best reply is Qb3." Every lesson is in words you can use in your next game.

- "Why not my move?" — challenge the engine's choice and get an explanation of your idea.

- Coach me as White or Black — get advice from either side of the board.

- Retry and reply — try the position yourself first, then see how the engine answers.

- Spoken reviews — Rook's explanations can be read aloud, handy for reviewing on the go.

## Puzzles and Puzzle Sprint

Analysis is only half of getting better — you also have to train.

- Free chess puzzles built around patterns from real games, including your own.

- Puzzle Sprint — a timed mode that pushes you to solve under pressure, the way a real clock does.

## Explore the Classics

- Interactive classic games, starting with Morphy's famous Opera Game (1858) — step through the moves, watch the evaluations, and hear why each move mattered.

## Fast, Private, and Free

- Runs in your browser — the Stockfish engine runs client-side, so reviews start fast and nothing to install.

- No account needed — no email, no signup. Come back later and your completed analysis is restored.

- Unlimited reviews for free — the project is independently run, supported by optional Ko-fi donations, and not affiliated with Chess.com or Lichess.

- Dark and light themes, multiple board styles, and full mobile support.

## Who It's For

- Club and casual players who want to know where their games really turned — without paying for a premium subscription.

- Chess.com and Lichess users who want a second opinion on their finished games.

- Coaches and parents looking for clear, spoken explanations to share with students.

- Puzzle grinders who want training focused on the mistakes they actually make.

Bottom line: ChessAnalyzer takes the games you already played, shows you exactly where they were won and lost, and turns those moments into minutes of focused training. Free, no signup required — try it at chessanalyzer.pro.