Home › Openings › Nimzo-Indian Defense › Nimzo-Indian Defense: Three Knights Variation Nimzo-Indian Defense: Three Knights Variation, Shocron Gambit ECO E21 · 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nc3 c5 5. d5 b5 Related variationsNimzo-Indian Defense: Three Knights Variation, Korchnoi VariationNimzo-Indian Defense: Three Knights Variation, Euwe Variation Practice this opening · Play against the computer