Hard Lines
Hard Lines is a chess opening trainer that uses breadth-first spaced repetition to help players master repertoire lines across their PGN files.
Open productWhat it does
About Hard Lines
Hard Lines is a chess opening training tool designed to build durable opening knowledge through breadth-first spaced repetition. Instead of drilling single long variations deeply while leaving the rest of a repertoire untested, the platform broadens early move choices across an entire opening tree first. Users can import any Portable Game Notation (PGN) file—such as Lichess studies, personal files, or exported courses—to create training material without vendor lock-in. Spaced repetition automatically schedules reviewed moves so that players remain prepared for the actual moves faced during games.
- Availability:
- unknown
- Access:
- unknown
- Format:
- software
Core capabilities
PGN Import and Course Creation
Imports Portable Game Notation files, including Lichess studies, personal files, and course exports, to construct custom training courses without platform lock-in.
Spaced Repetition Move Scheduling
Schedules reviewed chess moves using spaced repetition to reinforce repertoire recall effectively over time.
Useful for
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