E32Black9 book lines continue
Classical Variation, Keres Defense
Nimzo-Indian Defense1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6
Also known as Nimzo-Indian: Classical, 4...O-O 5.a3, 6...b6, Nimzo-Indian Defense, Classical Variation, Keres Defense, Nimzo-Indian.