Build
Import a repertoire PGN, build one yourself, or generate an editable snapshot of any Lichess player's recurring opening habits. Change or add lines using master and online games, evaluation data, or Opening Lab suggestions.
Analyze
Run a customizable repertoire review to uncover dangerous opponent ideas, or prepare for a Lichess player by finding repeated opening weaknesses in their games. Review actionable findings on a board and export reports or move trees as PDF.
Review
Cross-check your opening moves played in online games to see whether you remember your lines and use deviations to improve. Get a detailed report on mistakes or directly train the relevant positions.
Train
Train your complete repertoire or selected parts with spaced repetition, or choose any opening or line in your repertoire and train everything from that position.
Practice
Practice real opening decisions from either side against frequency-weighted moves from the Lichess or Master Games database. Every legal move is evaluated so you can see where your choices gain or lose ground.
Switch Sides
Switch sides to ensure you have a strong command over what opponent moves are covered in your repertoire for a given position so you don't start guessing over the board.