: 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).
: Puzzles are grouped into 5 main folders (A through E) and subdivided into 495 specific PGN files by ECO code. Lichess Puzzles By Eco zip
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 : Each puzzle entry includes the starting FEN,