Petrov's Defense: Classical Attack, Mason-Showalter Variation trainer
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Practise the Petrov's Defense: Classical Attack, Mason-Showalter Variation
Play Black's moves of the line from memory —
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 — and the trainer plays
White's replies; "Play the other side" turns it around.
"Drill all" adds the 4 named lines that continue it, such as Petrov's Defense: Classical Attack, Jaenisch Variation, Petrov's Defense: Classical Attack, Chigorin Variation, Main Line, Petrov's Defense: Classical Attack, Chigorin Variation, Browne Attack, Petrov's Defense: Classical Attack, Krause Variation.
Read about the line, its statistics on Lichess and Stockfish's evaluation on the Petrov's Defense: Classical Attack, Mason-Showalter Variation page, or pick another opening in the opening trainer.