(1) Nakamura,Hikaru (2789) - Carlsen,Magnus (2872) [E20]
Zurich Chess Challenge 2014 (3)
[GM Lubomir Kavalek/The Huffington Post]

Nakamura never defeated Carlsen in a classical game, but now he was as close as ever. Unfortunately, four moves before the time control, he took the wrong path.

The pawn advance wins a piece, but not the game. [The computers suggest 37.Qf1! b5 and white has a choice: (37...Na5 38.Qb5+- ) The quiet and astonishing 38.Ka2! This positional zugzwang is far more beautiful. White has to realize that black doesnâ?[]t have a good move, for example (Tactical fireworks: 38.Rxh7! Qxh7 (38...Kxh7 39.Qh1++- ) 39.Nh6++- ) 38...Nd6 (38...f6 39.gxf6 Qxf6 40.Nh6+ Kxg7 41.Rg2++- ) 39.Rh6+- ]

37...Nxd6 38.Nxd6 Rd8!
A complete turnabout! Not only is the open d-file more important than the knight, but white doesn't have many options. Hikaru had either overlooked black's last move or he underestimated the consequences.

[According to cyber-machines, the far leap 39.Nc8! should have been played, for example 39...Kxg7 40.Qh6+ (40.Ne7 Rd1+ 41.Ka2 Qe6+ 42.Qxe6 fxe6 43.Rh6 Rd7 44.Nc8 Rd2+ 45.Kb1 Rg2 ) 40...Qxh6 41.gxh6+ Kg6 42.Ne7+ Kg5= 43.Rg2+ Kf4 ; There is a problem: white gets mated after 39.Nf5? 39...Rd1+ 40.Ka2 Qe6+ 41.Kb2 Qb6+ 42.Kc2 Qb1+ 43.Kc3 Qb3# ]

39...Qxe4 40.Qh5?
[The saving move 40.Ne3 was not easy to find just before the time control. It leads to a draw after 40...Qd3 41.Nf5 Qd1+ 42.Kb2 Rd2+ 43.Rxd2 Qxd2+ and black has a perpetual check.]

40...Rd3! 41.Rh4 Qf5 42.Qe2 b5 43.Nd2 Qxg5 44.Qxd3 Qxh4 45.Ne4 Kxg7
Black has simply too many pawns for the knight.

[46.Nxc5 Qd4+! and black can't cope with the distant h-pawn.]

46...Qf4 47.Qg2+ Kf8 48.Kb2 h5 49.Nd2 h4 50.Kc2 b4 51.axb4 cxb4 52.Qa8+ Kg7 53.Qxa4 h3 54.Qb3 h2 55.Qd5 e4 56.Qh5 e3 57.Nf3 e2 58.Kb3 f6 59.Ne1 Qg3+ 60.Ka4 Qg1 61.Qxe2 Qa7+ 0-1