What do masters play here?
Play moves on the board — or tap them in the table — and see how often strong players chose each one, and how those games finished. The engine tells you what is best; this tells you what is normal, which is how you learn whether your idea is a real opening or something nobody has ever tried.
Tap a move to play it. Bars show how those games finished, not who stood better — a move can score well and still be second best.
252,225 games between strong players — world champions from Steinitz to Carlsen, and today’s top boards. The book runs 12 moves deep and only counts a position once at least 10 games reached it, so a line shown here is a line people genuinely play.
Opening names from the CC0 lichess-org/chess-openings list. Nothing is fetched while you browse — the book ships with the app, so it works on a plane and sends nothing anywhere.
Drilling a repertoire instead of browsing? The opening trainer tests you on real lines and corrects you when you leave the book.