![[CleanShot 2024-09-12 at [email protected]]] Mastery is a measure of how well you know your repertoire. To generate this, we look at the [[Chessbook Spaced Repetition System|spaced repetition]] intervals for your moves. A fresh move contributes 0 points, and a move that you're expected to remember for 100 days, contributes 1 point. We then divide this by the total number of moves in your repertoire to get a mastery score. Note that this is based on the interval of reviews, not the time until your reviews are due. So this won't go down if you stop reviewing for a couple months, despite lots of moves being due. True mastery would be a score of 100% here and no moves due.