Question 1

Is ChessAlfa free to use?

Accepted Answer

Yes. ChessAlfa is completely free with unlimited game analysis. There is no login, no signup, no daily limit, and no premium paywall — unlike Chess.com, which restricts free users to one game review per day.

Question 2

What chess engine does ChessAlfa use?

Accepted Answer

ChessAlfa runs Stockfish 18, the strongest open-source chess engine, directly in your browser via WebAssembly. Because analysis happens client-side, your games are never uploaded to a server.

Question 3

Can I analyze my Chess.com and Lichess games?

Accepted Answer

Yes. Enter your Chess.com or Lichess username to load your recent games, then pick one to review. You can also paste any PGN to analyze a game or position from another source.

Question 4

What does the game report include?

Accepted Answer

Each report shows per-player accuracy, an evaluation graph, and every move classified as Brilliant, Great, Best, Excellent, Good, Book, Inaccuracy, Mistake, Miss, or Blunder. It detects the opening, highlights the engine’s best move, and lets you explore alternative lines and variations.

Question 5

Do I need to create an account?

Accepted Answer

No. ChessAlfa works instantly with no account. Just open the site, load a game, and analyze.

Question 6

How is ChessAlfa different from Chess.com Game Review?

Accepted Answer

ChessAlfa gives you unlimited free game reviews with no daily cap and no subscription, using the same move-classification system (Brilliant, Best, Blunder, etc.) and accuracy scoring. Chess.com limits free accounts to a single review per day.

Question 7

What do the move classifications mean?

Accepted Answer

Brilliant (!!) marks a sound piece sacrifice; Great (!) is the only good move in a critical position; Best matches the engine’s top choice; Excellent and Good are near-best moves; Book is opening theory; Inaccuracy (?!), Mistake (?), Miss, and Blunder (??) mark increasing losses of winning chances, measured by win-probability drop.

Question 8

Is my game data private?

Accepted Answer

Yes. Stockfish runs entirely in your browser, so positions and games are analyzed locally and never sent to a server.

Question 9

How accurate is the analysis and can I change the depth?

Accepted Answer

ChessAlfa uses Stockfish 18, the same engine family used by titled players and analysis platforms. You can raise the search depth in Settings for deeper, more accurate evaluations, or lower it for faster reports.

About ChessAlfa

What ChessAlfa does

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