| RookFile: After 11....Nb4, 12. Ne5 is an interesting move. Strangely, 12.....Nc6! is a good reply by black: 
click for larger viewNimzo wouldn't play it this way, but in this specific situation, white's best move may be 13. Nf3, giving black the option of ...Nb4 again if he wants to. Against other moves:
A) 13. f4? invites 13......Qxd4+
B) 13. Nxc6 bxc6 14. Be3 Bb7 =
C) 13. Be3 Qc7 and white may have nothing better than 14. Nxc6 again, since 14. f4?! invites 14....Rd8 and black might even be slightly better. This is the type of position where a guy like Reshevsky or Karpov would do well in. You might think after ...Nb4 from black that the knight would automatically go to d5 next move. But those guys would willfully forget the previous history of how the pieces got to where they were and examine each position on its merits. I think either of them might have answered 12. Ne5 with 12....Nc6. Still white hasn't really lost anything after 12. Ne5 Nc6 13. Nf3 Nb4. Assuing he doesn't want a grandmaster draw, he just has to try something else. The point here is that a cagey white player might play 12. Ne5, hoping to have black burn several minutes off his clock - and then immediately answer 12......Nc6 with 13. Nf3 | 
Kibitzing
