Gambit Drill
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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.
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.