Not so fast, there is this sacrifice that intends to open up the black king's guard. The price of a knight to set the center in motion and open up the bishops is totally worth it.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. a2a3  4... b4c3  5. b2c3  5... c7c5  6. f2f3 Whenever the name Samisch is concerned, the white f-pawn modestly moves to the f3-square. It does, however, help White build the strongest center possible, which might translate into a decisive kingside attack. At least, this is what White is dreaming about. 6... b8c6 Black, on his turn, realizes that the opponent has burned some bridges and that the pawn on c4 might well be attacked with every single black piece. More or less, this pawn is doomed, dreams Black, and he has visions of a won queenside battle. 7. e2e4  7... d7d6  8. c1e3  8... b7b6  9. f1d3  9... e6e5 Kasparov named this the Portish-Hubner wall, and my database indicates that 9. ...0-0 is vanishing. Rightly so, why castle into White's attack? 10. d4d5  10... c6a5  11. g1e2  11... e8d7 A nice novelty! The king often walks toward the queenside on its own in the Nimzo-Indian Defense, not necessarily using the castling crutch. 12. e1g1  12... d7c7  13. f3f4 Vitiugov hurries to open the center. 13... f6g4 While Oparin tries to keep everything under blockade. 14. e3d2  14... e5f4  15. d2f4  15... f7f6 White's play seems done.