Build a repertoire — then actually remember it

Three modes, one loop

Most players collect opening knowledge and never test it. This closes the loop: build a line, drill it, then check whether it survived contact with a real game.

• 🏗️BuildPlay your line on the board with the master explorer open beside it — see what strong players actually chose at each point — then save it as your line. Add comments and variations as you go.
• 🎯TrainSpaced-repetition drilling of the lines that are due. You play your side's moves from memory; anything you get wrong comes back sooner.
• 🔍CheckScan your real games for the moment you left your own preparation — the exact move where you deviated, and what your line said instead.

Why "I know this opening" usually isn't true

Reading a line and recalling it under a clock are different skills. Spaced repetition targets the second one: the lines you keep getting wrong come back more often, and the ones you know drop away — so practice time goes where it's actually needed. Check mode then tells you whether it worked, using your own games rather than your impression of them.

Repertoire FAQ