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Hard Lines
Breadth-first spaced repetition for chess openings
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.
Hey! Made this because every opening trainer I tried made me an expert in one line and blind to everything else. Hard Lines flips that: breadth first, depth later, all scheduled with spaced repetition. Import any PGN and try it at hardlines.app — would love feedback, especially from anyone who's used other opening trainers and can compare the feel.
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About Hard Lines on Product Hunt
“Breadth-first spaced repetition for chess openings”
Hard Lines was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #160 on the daily leaderboard. 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.
Hard Lines was featured in Strategy Games (5.8k followers) and Education (79.1k followers) on Product Hunt. Together, these topics include over 33.9k products, making this a competitive space to launch in.
Who hunted Hard Lines?
Hard Lines was hunted by Louis Verstraeten. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Louis Verstraeten