Home › Openings › Nimzo-Indian Defense › Nimzo-Indian Defense: Three Knights Variation Nimzo-Indian Defense: Three Knights Variation, Euwe Variation ECO E21 · 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5 Ne4 Related variationsNimzo-Indian Defense: Three Knights Variation, Korchnoi VariationNimzo-Indian Defense: Three Knights Variation, Shocron Gambit Practice this opening · Play against the computer