Terms & data sources
The practical details behind using ChessJi, your training record, and the positions you practise.
Last updatedUsing ChessJi
ChessJi is a chess training tool. Use it lawfully and do not interfere with the service, other accounts, or its security. Training feedback and ratings are informational and do not guarantee a particular playing result.
Your account and progress
Keep your sign-in details secure and provide accurate account information. Your attempts, rating, and pattern history are used to personalise future training.
Puzzle data and attribution
Some training positions are derived from the Lichess open puzzle database. Lichess database exports are published under the Creative Commons CC0 dedication. ChessJi is an independent product and is not affiliated with, endorsed by, or sponsored by Lichess.
View the official database and licence informationAvailability and changes
Features, puzzle availability, and these terms may change as ChessJi develops. The date above will be updated when this page changes materially.