: Puzzles are grouped into 5 main folders (A through E) and subdivided into 495 specific PGN files by ECO code.
: 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 Lichess Puzzles By Eco zip
: 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