In Nimzo Indian lecture 1 GM Henrik Danielsen discusses 4... O-O 5. a3 Bxc3 6. Qxc3 b6 7. Bg5 Ba6 (idea of Karpov instead of Bb7) 8. e3 d6 9. Bd3 Nbb7 10. Nf3 (sideline of the main Ne2) c5 and here the lecture concentrates on 11. d5, 11. b4, and 11. O-O
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