Alekhine - Nimzovitch, San Remo 1930

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Bd2 Ne7 6. Nb5 Bxd2+ 7. Qxd2 O-O 8. c3
b6?! 9. f4 Ba6 10. Nf3 Qd7 11. a4 Nbc6 check the previous post's diagram. Hence
12. b4! (Alekhine takes space on the queenside and takes control of the a5 square. Nimzovitch planned to play Nb8-c6-a5) cxb4 13. cxb4 Bb7 14. Nd6 f5