Theoria

What openings do you actually play?

Enter your Lichess or Chess.com username and watch every opening you play, as White and as Black, grow into one tree from your games.

Chess.com or Lichess. No sign-up: we only read your public games.

Analyze your games in Theoria
What you'll see

Your openings, read from your own games.

  1. Every line as one tree

    Each game you played becomes a path from the starting position, and the paths merge into one tree: the moves you keep choosing, and the replies you keep facing. Each ring is a move deeper. Switch between White and Black to see each repertoire.

  2. Every position, named

    Point at any dot to see its board, the moves that reach it and the opening it belongs to, from the Sicilian's main lines to the rarest named gambits in the openings encyclopedia.

  3. Patterns in your play

    While your games load, Theoria picks out what stands out: your favorite opening, your opponents' favorite reply, the time control you play most and your longest winning streak.

Then what?

Turn what you play into what you know.

Most players repeat the same openings without ever studying them, and lose the same way to the same replies. Import the same username into Theoria and it builds a repertoire from the moves you play most, adds the common replies you haven't met yet, and trains every move with spaced repetition until you know it cold. Want something new instead? The opening guides list the best openings for every style.

Start free in your browser

Frequently asked questions

Is the opening analyzer free?

Yes. There's no sign-up and nothing to install: enter a username and the analysis runs in your browser.

Which games does it look at?

Your public games, newest first: up to 1,000 from Lichess or 3,000 from Chess.com. Lichess limits how fast games can be downloaded, so a large Lichess history takes up to a minute.

Does it save my games or my username?

No. The games are fetched and analyzed for this page only, and nothing is stored. Close the tab and it's gone.

Can I analyze someone else's openings?

Yes. Any public Lichess or Chess.com account works, so you can look at an upcoming opponent's openings as easily as your own.

How do I learn the openings it finds?

Import the same username in Theoria. It builds a repertoire from the moves you play most, adds the common replies you haven't faced yet, and trains every move with spaced repetition. Free on the web, iOS and Android.