Train your chess openings against the moves you'll actually face.
Bring the repertoire you already have — a Lichess study, or any PGN. The opponent doesn't play textbook theory; it plays what players at your rating actually play, drawn from 50 million real games.
Your studies, real opponents
The opening explorer is free for everyone. A free account lets you bring your studies in and drill them against real-game odds.
Bring the studies you have
Paste or upload a PGN — a Lichess study export, or anything else. Arrows and highlighted squares come across with it.
Face what people actually play
Three training modes: cover every branch of your repertoire, drill only the lines you will realistically meet at your rating, or let the opponent leave theory and catch them at it.
Organize and share
Group your lines into books and chapters, tag them, and share a whole book with another player. Train a book, a chapter, or a handful of studies.