u/Sanglor

Built this because I kept forgetting openings past move 6 in real games.

What it does:

- Learn mode: every move has a coach explanation (the why, not just the move)

- Drill mode: play the line from memory, get corrected instantly

- Quiz mode: position appears, you find the right move

- Smart Reviews: SM-2 spaced repetition schedules what to revisit and when

Also has a 6-question wizard that builds a personalized repertoire based on playing style, and can import your Lichess/Chess.com game history to refine picks.

Stack: React 19, Vite, Zustand, Supabase, Stripe. SM-2 implemented from scratch.

436 lines, 29 opening families. Free tier is genuinely usable.

knightline.app

Been using Anki for languages for years. When I tried to memorize chess openings the same way, standard card decks didn't work well : a position without context is hard to review meaningfully.

So I built something where instead of "front/back" cards, you see a board position and have to play the correct move. SM-2 tracks each position individually and schedules reviews based on how fast you recalled it.

The ratings map directly to SM-2 quality scores (0-5): Fail / Very Hard / Hard / Correct / Good / Perfect.

Retention after 3 weeks of daily reviews is noticeably better than when I was just replaying lines in a database.

Anyone else tried SRS for chess specifically? Curious if the algorithm needs tweaking for motor memory vs pure recall.

knightline.app if you want to see the implementation.

https://preview.redd.it/6bxm3ud3xmtg1.png?width=3600&format=png&auto=webp&s=e050ab03b909634b0dcfbf52f49bbe1eb6086b60

https://preview.redd.it/wfu0cvd3xmtg1.png?width=3600&format=png&auto=webp&s=c2bd27d735203aebd13eea893e243e86ffaf53bf

https://preview.redd.it/7f8iwud3xmtg1.png?width=3600&format=png&auto=webp&s=5b93404bb8cf0deda84f09590978a832238d1fb4