Nimzo-Indian Defense: Ragozin Defense trainer
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Practise the Nimzo-Indian Defense: Ragozin Defense
Play White's moves of the line from memory —
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 Nc6 7. O-O — and the trainer plays
Black's replies; "Play the other side" turns it around.
"Drill all" adds the 1 named line that continue it, such as Nimzo-Indian Defense: Ragozin Variation.
Read about the line, its statistics on Lichess and Stockfish's evaluation on the Nimzo-Indian Defense: Ragozin Defense page, or pick another opening in the opening trainer.