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Ian Nepomniachtchi vs Yifan Hou
FIDE Grand Prix Moscow (2017), Moscow RUS, rd 1, May-12
Queen's Gambit Declined: Exchange Variation (D35)  ·  0-1

8
7
6
5
4
3
2
a
1
b
c
d
e
f
g
h
White to move.
ANALYSIS [x]
0-1

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
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Kibitzer's Corner
May-13-17
Premium Chessgames Member
  An Englishman: Good Evening: 9...Nxd7 seems to leave opening theory, and can't tell if it set a trap for Black or for White (!). White looked eager to sacrifice the Exchange to keep the Black King in the center, and the silicon monsters will have to decide if White missed a winning line in the middle game or if Black played inspired defense throughout.
May-13-17  Strelets: <An Englishman> My suspicion is that it's the latter. I just don't think White gets enough play for the exchange.
May-13-17  Sokrates: Quite enjoyable to see how Yifan kept her cool through the whole game and slowly but surely gained material while rejecting all Nepo's attempts to establish compensating attacks. Very well conducted by the world's strongest female player who once again has the pleasure of leading a strong tournament, albeit the pleasure is likely to become short-lived.
May-13-17  paavoh: Agree with <Strelets>. White just did not have enough oomph in the position after the speculative exchange sac.
May-13-17  CountryGirl: Game should not be classified as QGD Exchange Variation - it's not.
May-13-17  zanzibar: SCID also classifies this as QGD xchg.
May-14-17
Premium Chessgames Member
  HeMateMe: what was the Nepster thinking? He must have missed something while planning out this line on his kitchen table.

wouldn't black have made her job easier if she had traded queens at g2 when the opportunity first arose?

May-19-17  rajb245: <An Englishman> 9...Nxd7 is found as the best move by my engine (Stockfish 8) at depth 28, so it's possible this is a novelty Yifan found using engine analysis and she had in her back pocket from her preparation. For what it's worth, I only see one GM level game where this position was reached (Aronian vs F Vallejo Pons, 2017), and Pons played the natural 9...Qxd7
May-21-17  Monocle: <CountryGirl: Game should not be classified as QGD Exchange Variation - it's not.>

White didn't play an early Nf3, so it isn't a Semi-Tarrasch. What else would it be?

Jun-14-17  pawndude88: Kudos for Hou for only drawing 4 games in the tournament.
Jul-05-17  cormier: 12.Bf6 ...
Jul-08-18  cormier: oh, sorry 99 ..... lol .......

Analysis by Houdini 4: d 22 dpa

1. = / + (-0.55): 12...Bf6 13.Qc2 Rc8 14.Qd1 Rc4 15.Rxa7 Rxd4 16.Qe2 Rd3 17.e5 Bxe5 18.Bd2 Nc4 19.Nf3 0-0 20.Bb4 Qd5 21.Nxe5 Nxe5 22.0-0 Rd8 23.Ra5 Qb7 24.Bc5 Nc6 25.Ra4 Rd2 26.Qa6 Qd7 27.Be3 Rd1 28.g3 Ne5 29.Rxd1 Qxd1+ 30.Kg2

Jul-08-18  cormier: Analysis by Houdini 4: d 20 dpa

<1. = (-0.12): 21.Bxf8> Rxf8 22.Nh4 f4 23.g5 Nd5 24.Nf3 Nc3 25.Re1 Nxa2 26.g6 h6 27.Ra1 Nc3 28.Qg4 a6 29.Ra5 Ne4 30.Ra1 Qc4 31.Kg2 Kh8 32.Ra3 Rf5 33.Ra1 Qc2

Jul-08-18  cormier: Analysis by Houdini 4: d 22 dpa

<1. = (-0.03): 12.Bd2> Qc8 13.Rxe7+ Kxe7 14.Bb4+ Ke8 15.Ne2 f6 16.0-0 Kf7 17.Qb3 Qc4 18.Rc1 Qxb3 19.Rc7+ Kg6 20.axb3 Rac8 21.Rxa7 Ra8 22.Nf4+ Kh6 23.Rxa8 Rxa8 24.Kf1 e5 25.dxe5 fxe5 26.Nd3 Nd7 27.Bd6 Ra6 28.Bxe5 Nxe5 29.Nxe5 Rb6 30.Ke2 Rxb3 31.f4 Rc3 32.Kd2 Ra3 33.g3 Kh5

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