Hard Lines
Breadth-first spaced repetition for chess openings
What is Hard Lines?
Depth-first opening trainers bury you in one long line. Hard Lines imports any PGN (Lichess studies, your own files, course exports) and drills your early choices across the whole tree first, then goes deeper as you're ready, using spaced repetition to keep it all fresh. Bring your own repertoire, no marketplace lock-in.
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