License & Attribution – ChessWarmUp
Last updated: March 2026
ChessWarmUp includes curated chess puzzles derived from publicly available chess games and databases.
Puzzle Sources
Some chess positions used in the application may originate from publicly available chess game databases.
This includes games from the Lichess database.
Lichess game database:
https://database.lichess.org
The Lichess database is released under the Creative Commons CC0 license, which allows free use of the data.
ChessWarmUp selects and curates positions from publicly available games for training purposes.
Intellectual Property
While the original chess games may be publicly available, the selection, curation, presentation, and structure of puzzles in ChessWarmUp are part of the ChessWarmUp project.
Contact
For questions regarding licensing or attribution: