Rarely does piece repositioning in the middlegame shine so brightly as it does here in Ahues-Nimzovich; for the complete game, check out
But for our purposes, let's look at the position at move 11 after a few dubious opening moves by Black. Here a number of people smarter than myself have suggested that White play 11. Bf3, or 12. Bf3 to crimp Black. Black, on the other hand, is facing a mobile Q-side pawn majority and is underdeveloped.
11. Rd1 O-O 12. c3?! (Bf3 is again suggested) Bg4! (forces off the White LSB) 13. Be3 Bxe2 14. Ndxe2 Rc8! (This is what really impressed me. One of Nimzo's 'mysterious rook moves', which is a sign of his laser-like focus on restraining the White queenside pawns. Not an easy find.)
15. Rd2 Nc6 16. Rad1 Ne5 (aiming at c4) 17. b3 (preventing Nc4) b5! (more restraint!) 18. h3 e6! (Supports an outpost on d5, and signals the turn of the tide toward Black. Black eventually wins in style, worth a look.)
Compare the position after move 10 and after move 18, and you can see how the superior player can turn a position around quickly and quietly.