By Eco Zip - Lichess Puzzles

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

: Each puzzle entry includes the starting FEN, the move sequence to solve it, the puzzle's rating, and "Themes" tags (e.g., fork, pin, mate in 2). Lichess Puzzles By Eco zip

: Puzzles are grouped into 5 main folders (A through E) and subdivided into 495 specific PGN files by ECO code. While the official Lichess database provides puzzles in

The phrase refers to a popular community-curated dataset where millions of Lichess puzzles are organized into zip files based on their Encyclopedia of Chess Openings (ECO) codes . What the Zip Files Contain What the Zip Files Contain These zip files

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