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Chess AnalysisEngine, opening and position analysis in one place.Game ReviewFull Stockfish review with move grades and accuracy.Chess.com AnalysisImport and review your Chess.com games.Lichess AnalysisImport and review your Lichess games.PGN AnalyzerPaste or upload PGN files, including multi-game databases.Blunder CheckerFind the moves that lost your game and what to play instead.

Stockfish AnalysisRun Stockfish 19 in your browser with multiple lines.Position AnalysisPaste a FEN and get the best move and evaluation.Next Move CalculatorSet up any position and ask the engine what to play.Board EditorBuild a position from scratch and export the FEN.Accuracy CalculatorAccuracy for both players with a transparent formula.Elo CalculatorRating change for a single game with any K-factor.Rating CalculatorPerformance rating and rating change over a tournament.

Opening AnalysisOpening guides with validated lines and plans.Opening TrainerDrill main lines move by move against the board.PuzzlesCheckmate puzzles verified by a solver.CoachAutomated improvement insights built from your analysis.BlogArticles on analysis, openings, tactics and improvement.

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Questions, bug reports, corrections and ideas are all welcome. Use the form, or email us if you prefer.

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Tell us what you did, what you expected and what happened. The PGN or the shared report link, plus your browser and device, usually let us reproduce it.
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Stockfish analysis that runs in your own browser. Every tool on this site is free, with no account, no advertising and no premium tier. Built for the love of the game.

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Analyze

Chess Analysis
Game Review
Chess.com Analysis
Lichess Analysis
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Free Chess Analyzer
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Tools

Stockfish Analysis
Position Analysis
Next Move Calculator
Board Editor
Accuracy Calculator
Elo Calculator
Rating Calculator

Learn

Opening Analysis
Opening Trainer
Puzzles
Coach
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Openings

Sicilian Defense
French Defense
Ruy Lopez
Queen's Gambit
Italian Game
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Caro Kann Defense

Chessblood is an independent project and is not affiliated with, endorsed by or connected to Chess.com, Lichess or the Stockfish developers. Stockfish is free software released under the GNU GPL v3; the engine build served here and its source are listed on our licenses page.

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