OpenBook
Free chess opening trainer
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What is OpenBook? ↓Build an opening repertoire. Practice until it sticks.
OpenBook is for chess players who want to improve their opening prep. Our goal is to be simple and intuitive. There are two modes:
Mode 1
Build your repertoire
Pick a side, walk through your lines, and let the Lichess opening database show you what real players (at both your rating and at the master level) actually play. Save the moves you want to learn. Then check your prep with one click: find popular opponent moves you haven't answered, and let Stockfish — running right in your browser — flag the moves in your repertoire that give up ground.
Mode 2
Practice your repertoire
Drill your saved lines with spaced repetition so they become second nature. Lines you get wrong come back sooner; lines you've mastered stay out of your way until you need a refresher. Preparing for something specific? Save any part of your repertoire — say, your anti-Sicilian lines — as a named set and focus a session on just those. A few minutes a day keeps your whole repertoire sharp.
