(1) Hou,Yifan (2591) - Koneru,Humpy (2600) [C67]
WCh Women Antakya TUR (5.1), 16.12.2010

1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Nd6
Having found no games with Koneru playing the Berlin, it seems this is a first for her as black.

6.Bxc6 dxc6 7.dxe5 Nf5 8.Qxd8+ Kxd8 9.Nc3 Ke8 10.Ne2 Be7 11.b3 a5 12.a4 Be6 13.Bb2
[13.Nf4 Rd8 14.Bb2 h5 15.Rad1 Rxd1 16.Rxd1 g5 17.Nxe6 fxe6 18.Bc1 Rg8 19.Kf1 g4 20.Nd2 Kf7 21.Ne4 Rd8 22.Rxd8 Bxd8 23.Bg5 Bxg5 24.Nxg5+ Ke7 25.c3 1/2-1/2 Sokolov,A-Salov,V/Bukhara 1981/EXT 2002 (66)]

13...h5 14.Nfd4 Nxd4 15.Nxd4 Rd8 16.Nxe6 fxe6 17.Rad1 Kf7 18.g3 Bb4 19.Kg2 Bd2 20.Kf3 Rd5 21.Ke2 Rhd8 22.c4 R5d7 23.Bc1 Bc3 24.Rxd7+ Rxd7 25.f4

A strange decision since the black king's only route to join the battle was via g6-f5. Now this avenue is closed.

26.Rf3 Bb4 27.Rd3 Rxd3 28.Kxd3
This is a grim ending to have to defend with black, as many a player of the Ruy Lopez Exchange can attest to. Even if it is defensible, the task is arduous and unpleasant.

28...Be7 29.Be3 c5 30.Ke4 b6 31.Kf3 Bf8 32.g4 Be7 33.Kg3 c6 34.Kh3 Bd8 35.Bf2 Bc7 36.Bh4 hxg4+ 37.Kxg4 Kg7 38.Bf6+ Kf7 39.Bh4 Kg7 40.Bf6+ Kf7 41.Kg5 b5 42.Kh6 bxa4 43.bxa4 Bb6

This tempting and aesthetically pleasing move is in fact a blunder and would allow Black to draw. The idea is correct, but it had to be prepared first. [44.h4 Bc7 45.Bg5 A small triangulation to force zugzwang. The immediate Be7 is strong, but this way it is even stronger. 45...Bb6 46.Be7 Bc7 (46...Kxe7 47.Kxg6 The difference between the game's blunder and here is that now the h-pawn is already on h4 and can just zip ahead. Now Black lacks the time to bring the bishop around. 47...Kf8 48.h5 Bd8 49.h6 Kg8 50.h7+ Kh8 51.Kf7 Kxh7 52.Kxe6 Kg7 53.Kd7 Bh4 54.f5+- ) 47.Bxc5 Bd8 48.h5 gxh5 49.Kxh5 Kg7 50.Ba7! Kf7 51.c5! Kg7 52.Bb6+- ]

One of those cases of mutual blindness. [The saving move was 44...Kxe7! 45.Kxg6 Bd8 and the bishop not only controls the entry to f6 but also the h4 square. 46.h4 (46.Kg7 Ke8 ) 46...Kf8 47.h5 Kg8 48.h6 (48.f5 exf5 49.Kxf5 Kg7 50.Ke6 Bc7 ) 48...Bh4 49.h7+ Kh8 50.Kf7 Kxh7 51.Kxe6 Kg7 52.Kd7 Kf8 53.Kxc6 Bg3 54.Kxc5 Bxf4= ]

45.Bxc5 Bd8 46.Bf2 Be7 47.c5 Bf8+ 48.Kg5 Be7+ 49.Kg4 Ke8 50.Be1 Bxc5 51.Bxa5 Be7 52.Kf3 Kd7 53.Ke4 c5 54.Kd3 Kc6 55.Kc4 Bh4 56.Bd2 Bf2 57.h3
[57.a5! Bh4 58.a6 Be7 59.a7 Kb7 60.Be3! Bf8 61.Bxc5 ]

57...Bg1 58.Bc1 Bf2 59.Bd2 Bg1 60.Kd3 Bf2 61.Be3 Be1 62.Kc4 Bb4 63.Bf2 Kb6 64.Be3 Kc6 65.Bg1 Kb6 66.Bf2 Kc6 67.Bh4 Bd2 68.Bg5 Be1 69.Be7 Bf2 70.a5 Be3 71.Bg5 Bf2 72.h4 Bg3 73.a6 Bf2 74.h5 gxh5 75.f5 exf5 76.e6 Bg3 77.e7 Kd7 78.a7 1-0