1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. a2a3  4... b4c3  5. b2c3  5... b7b6  6. f2f3 The Samisch line. As in all the relative lines that are named after the German GM, the modest f2-f3 move aims for a solid central occupation, followed by a monstrous kingside attack. 6... b8c6  7. e2e4  7... c6a5  8. f1d3  8... c8a6  9. d1e2  9... d7d6  10. f3f4 \"I wanted to go for a fight today after my loss two days ago so I thought, let's give it a try.\" (Van Foreest) What the young Dutch meant was that he was basically burning the positional bridges behind him. If his kingside attack would not succeed, he was doomed to a miserable failure on the opposite wing. 10... d8d7 Giri started to burn quite a lot of time on the clock, but follows the most straightforward path towards the enemy weaknesses. 11. g1f3  11... d7a4  12. f3d2  12... e6e5 A novelty, played after a lengthy thought. 13. e1g1  13... e8g8 Now that is certainly play with the fire game. 14. f4e5  14... d6e5  15. a1b1 After a lot of hesitation, White finally declines the immediate sacrifice. 15... c7c5 But Giri invites the sacrifice once more! He desperately needs to win in the contest for the first place and this might explain the logic behind his decision. 16. f1f6 And White does not need a second invitation! From the times of Bronstein, this might be White's most famous sacrifice in the Nimzo-Indian. The first player often even sacrifices a pawn there with some f5-f6, lures the black knight back on the f6-square and then takes it. 16... g7f6  17. e2f3 The point behind the sacrifice is that the black king has been weakened forever. And that is a permanent weakness. Which, by the Dorfman theory, means that White needs not to rush; he holds the long-term trumps! 17... a4c6  18. d4d5  18... c6d6  19. d2f1  19... g8h8 Giri is in a hurry to bring the rook out to defend the f6-pawn. 20. f1e3  20... a6c8  21. c1d2 No rush! Just bring everyone out there and the weaknesses will start dropping. 21... f8g8  22. d2e1  22... g8g6  23. e1h4  23... g6h6  24. f3f2  24... c8d7 Giri does everything that he can but the avalanche is about to move. 25. b1f1 Now almost all the white pieces are where they are needed, just one last reserve player is left behind. 25... h8g7 This can hardly be called a mistake. 26. d3e2 Last reserves en route. 26... h6g6  27. h2h3 A pretty way to make it to the f6-pawn! 27... d7h3  28. e2h5 It is not just the exchange that Black loses, it is mainly about the f6-pawn. 28... h3d7  29. h5g6  29... f7g6  30. h4f6 and Black is due to collapse on the dark squares. 30... g7g8  31. f2h4  31... a8f8 