King's Indian Defense: Four Pawns Attack trainer
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Practise the King's Indian Defense: Four Pawns Attack
Play White's moves of the line from memory —
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. f4 — 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 King's Indian Defense: Four Pawns Attack page, or pick another opening in the opening trainer.