Chessbook Spaced Repetition System

Each move in your repertoire has its own review history: when you last reviewed it, how difficult it has been for you, when it is due again, and so on. We use this to decide when you should next see that move, so you're seeing the moves you're likely to forget soon, but not getting overwhelmed by moves that are already easy for you.

Our spaced repetition system is based off of FSRS. It is inarguably the best open-source spaced repetition system out there, and arguably the best spaced repetition system in general.

Move progress is shared between repertoires, so if you play 1.e4 in three different White repertoires, that progress will be shared.