Lichess Puzzles By Eco Zip -

While the official Lichess database provides puzzles in a single large CSV or BZ2 file, the "By ECO" organization was a specific project shared by community members: download all puzzles - Lichess.org

These zip files are typically PGN (Portable Game Notation) collections structured so you can practice tactics specifically related to certain openings: Lichess Puzzles By Eco zip

: These are designed for offline training or for use in external chess software (like Scid vs. PC) where users want to drill tactics that arise from their own opening repertoire. Where to Find the Data While the official Lichess database provides puzzles in