Lion Defense: Lion's Jaw trainer
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Practise the Lion Defense: Lion's Jaw
Play White's moves of the line from memory —
1. e4 d6 2. d4 Nf6 3. f3 — and the trainer plays
Black's replies; "Play the other side" turns it around.
Read about the line, its statistics on Lichess and Stockfish's evaluation on the Lion Defense: Lion's Jaw page, or pick another opening in the opening trainer.