King's Gambit Accepted: Modern Defense trainer
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Practise the King's Gambit Accepted: Modern Defense
Play Black's moves of the line from memory —
1. e4 e5 2. f4 exf4 3. Nf3 d5 — and the trainer plays
White's replies; "Play the other side" turns it around.
"Drill all" adds the 3 named lines that continue it, such as King's Gambit Accepted: Abbazia Defense, King's Gambit Accepted: Abbazia Defense, Main Line.
Read about the line, its statistics on Lichess and Stockfish's evaluation on the King's Gambit Accepted: Modern Defense page, or pick another opening in the opening trainer.