King's Indian Attack: Double Fianchetto trainer
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Practise the King's Indian Attack: Double Fianchetto
Play Black's moves of the line from memory —
1. Nf3 d5 2. g3 g6 — and the trainer plays
White's replies; "Play the other side" turns it around.
"Drill all" adds the 1 named line that continue it, such as King's Indian Attack: Pachman System.
Read about the line, its statistics on Lichess and Stockfish's evaluation on the King's Indian Attack: Double Fianchetto page, or pick another opening in the opening trainer.