Lichess puzzle database — CC0 1.0 Universal
Source: https://database.lichess.org/#puzzles
License: https://creativecommons.org/publicdomain/zero/1.0/
Export date shown by source: 2026-09-10
Downloaded prefix: 2026-09-29, first 2,097,152 bytes of lichess_db_puzzle.csv.zst.
295 puzzles selected from complete CSV rows of that prefix by
scripts/build_learning_pack.py (rating, popularity, deviation and topic filters).
This is an offline prototype starter pack, not the full database or a random sample.
Puzzle ratings/themes and original game links are preserved.
The first UCI move is the opponent's setup move. The solver starts at the second move.
