The key move 11 in Nimzo Indian opening discussed in details
GM Henrik Danielsen begins a lecture on the Nimzo Indian 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2, it will continue running next to the episodes of 1. f4 and the Accelerated Dragon.
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
The video also looks at ideas of Karpov and Sokolov, as well as example from Milov – Topalov game.