Gambit Drill
Chess.com scan
Finds opponent moves you have no line for.
Weak spots
Stockfish checks your recent games and turns your costliest opening mistakes into drills.
Training
Lichess
Read-only master statistics in Review; no account scopes are needed. Stays on this phone and is sent only to Lichess.
Backup
About and licences
Gambit Drill — Chess Opening Trainer. The original app is proprietary; personal, non-commercial use is allowed under its licence.
Stockfish 18 is a separate, unmodified Web Worker under GPL-3.0. Third-party notices and source links.
Only coach notes marked with the Wikibooks source are under CC BY-SA 4.0. Attribution and licence.
Questions or feedback? Share them in GitHub Discussions.
Lichess and Chess.com requests run only when you choose their features. Your Lichess token stays in this browser and is sent only to Lichess for Explorer requests.