Dutch Defense: Hort-Antoshin System trainer
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Practise the Dutch Defense: Hort-Antoshin System
Play Black's moves of the line from memory —
1. d4 f5 2. c4 Nf6 3. g3 d6 4. Bg2 c6 5. Nc3 Qc7 — and the trainer plays
White's replies; "Play the other side" turns it around.
Read about the line, its statistics on Lichess and Stockfish's evaluation on the Dutch Defense: Hort-Antoshin System page, or pick another opening in the opening trainer.