1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf64. d4 ed4 5. Nd4 Bb4 6. Nc6bc6 7. Bd3 O-O 8. O-O d59. ed5 cd5 10. Bg5 c6 11. Na4The idea behind this move is to fight for c5-square. [11. Qf3 as played in Morozevich-Kramnik, Tal Mem. Moscow 2013 is stronger according to Mikhalevski.] [Here 11. Ne2also used to be played. Currently it is out of fashion and not mentioned by Mikhalevski and other commentators.] 11... Bd6 Now that the knight is no longer onc3 there is no point in keeping the bishop on b4. Besides, the b-file should be clear for the rook. [11... h6 immediately challenging the bishop is also played here.] 12. c3 Preparing to play b4 followed by Nc5. But it has to be prefaced by exchange of dark-squared bishops. A time-consuming plan that is not allowed to take place. [12. c4 is sharper and better.] 12... Re8 13. Bh4 The bishop is coming to g3.13... Bg4 Carlsen provokes14.f3 after which the move Bg3will be less desirable. 14. f3[14. Qc2!? deserves attention according to Mikhalevski. It avoids the weakening of kingside and also retains the option of Bg3 followed by exchange of bishops. The immediate threat would be15. Bxh7.] 14... Bh5 15. Qc2Threatening 16.Bxh7 that is easily parried. The queen move should have come one move before. 15... Bg616. Rae1? A routine move that is wrong as shown by Carlsen's reply. [16. Bg6 hg6 is preferable, although after17. Bf2 Qc7 18. g3 c5 followed by 19...Qc6 Black is better.]16... Qc7! Forcing a further weakening of the kingside.17. g4! A brilliant and courageous solution coming as it does in a blitz game. Nakamura sacrifices the pawn hoping to to exploit the opening of the h-file. [White cannot afford to weaken g3with 17. h3? Bd3 18. Qd3Nh5!¤] [Nor can he play 17. g3Bd3 18. Qd3 Nd7 and the bishop on h4 would be out of play.] 17... Bd3 18. Qd3 Nd7With the positional idea to exploit the weakening of the f4-square by bringing his knight to either g6 or e6. [After the correct 18... Bh2! 19. Kg2 h5!¤Black is a healthy pawn up. But this is a blitz game and Carlsen avoids complications.]19. Qc2 Nf8 20. Re8 Now that he has not lost a pawn White hopes to exchange material and simplify the position.[20. Qf2 Ne6 21. Bg3 would have improved the position of the bishop.] 20... Re8 21. Re1Rb8 With latent pressure on b-file [The simple 21... Re122. Be1 Ne6¤ is also good.]22. Kg2? [22. Qf2!? with the idea of 23.Bg3 still deserves attention.] 22... Ne6 [22... Bh2winning a pawn and stopping23.Bg3 is also OK.] 23. Bg3c5! Underlining the bad position of the knight on a4.24. b3 Hoping to bring back the knight to play via b2. 24... c4!25. Rd1! Rightly attacking Black's own weak point [If25. Nb2? Bg3 26. hg3 Qb7¤]25... cb3! 26. ab3 d4 27. Bd6Qd6 28. cd4 Nf4 [Not28... Nd4? 29. Qe4¢] 29. Kh1Qd5?! Carlsen also goes astray. [The right move is29... Re8! 30. Nc5 Qc6!(30... Qd4 is beautifully met by31. Ne6!! Qe3 32. Nf4 Qf433. Kg2=) 31. d5! Nd5£ and White is still under some pressure.] 30. Qe4!= Qb331. Re1? This move looks strong with the threat of back rank mate or Qxf4. Sadly, it is refuted by Black's energetic reply. [31. Nc3! with the threat of 32.Rb1 would have forced Black to exchange the knights with 31... Qc3 32. Qf4=]31... g5!»+ A terrific shot putting an end all to back rank threats. Carlsen does not worry about the break up of the kingside.The knight on f4 firmly secured by the pawn on g5plays a decisive role in the ensuing kingside attack.[Nakamura was probably hoping for 31... Ng6? 32. Nc5]32. Nc5 [32. Ra1 Rd8! Now the White queen cannot move without losing the d-pawn or f-pawn. 33. Nc5 Qc3 34. Rg1a5»+] 32... Qa2! 33. Rg1 Nh3!Winning the exchange with the threat of 34...Nf2. 34. Nd3 Ng135. Qe5 Nf3! Black returns his extra rook and obtains a decisive attack. 36. Qb8 Kg7Threatening 37...Qe2. 37. Ne1Qa1! 38. Kg2 Ne1 39. Kf2 Nd340. Ke3 Qc3! 0-1
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