E21
Nimzo-Indian Defense
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3
The Nimzo-Indian Defense is a chess opening classified under ECO code E21. It is reached after the moves 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3.
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