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Ju Wenjun vs Tan Zhongyi
Tan - Ju Women's World Championship Match (2018), Chongqing/Shanghai CHN, rd 8, May-15
Queen's Gambit Declined: General (D30)  ·  1/2-1/2


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Kibitzer's Corner
Premium Chessgames Member
  whiteshark: Ju Wenjun missed an excellent opportunity to get a decisive advantage in the match:

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White to move

1) +3.08 (32 ply) <27.Rxe5! Nxe5 28.f4> Ng4 29.Qxf6 Nxf6 30.Bc4+ Nd5 31.Bxd5+ cxd5 32.Nd4 b4 33.Nc6 Re8 34.Nxa7 Re7 35.Nb5 Be8 36.Nd6 Bd7 37.Rxd5 Re1+ 38.Kc2 Rh1 39.Rd2 Rf1 40.Rd4 Rf2+ 41.Kb3 Be6+ 42.Nc4 Kf7 43.c6 Ke7 44.Kxb4 Rc2 45.c7 Rxh2

2) +0.91 (31 ply) 27.f4 Rxe1 28.Qxe1 Kf8 29.Bc2 Rxd1+ 30.Qxd1 Nd8 31.Nd4 a5 32.a3 a4 33.Qd2 Ke7 34.Qd3 Nb7 35.Qc3 Nd8 36.Qd2 Kf8 37.Qe3 Kg8 38.Bd1 Nb7 39.Qc3 Bf7 40.Nxb5 Qxc3 41.Nxc3 Nxc5 42.Bc2 Ne6 43.Bxf5 Nxf4

3) +0.08 (31 ply) 27.Bc2 f4 28.Rxd8+ Qxd8 29.Bxg6 Rxe1+ 30.Qxe1 hxg6 31.Qe4 Qf6 32.Nd4 Ne5 33.h4 Kg7 34.Kc2 a5 35.b3 Kh7 36.Kd1 Kh6 37.Ne2 Nd7 38.Qxf4+ Qxf4 39.Nxf4 Nxc5 40.Ke2 g5 41.hxg5+ Kxg5 42.Ke3 Kf5 43.Ne2 Ne6 44.Nd4+ Nxd4 45.Kxd4 Kf4 46.Kc5 b4

6.0 minute analysis by Stockfish 9 v010218

May-15-18  goodevans: <whiteshark> That's true but that first line gets pretty difficult to analyse beyond 32.Nd4.

It's not obvious (to me at least) that white has an advantage here nor what the best play is for either side. I suspect Ju Wenjun saw that line and dismissed it as simplifying too much without sufficient advantage.

One for the computers, that one.

May-15-18  The17thPawn: <whiteshark> - What's the line if black captures with queen rather than knight in your first variation? 27...Qxe5
May-16-18  goodevans: <The17thPawn> 27.Rxe5 Qxe5 28.Qxe5 Nxe5 29.Bc4+ bxc4 30.Rxd8+ wins the exchange.
Premium Chessgames Member
  grubyilysy: Goodevans, I do not agree. Good "blocking" knight on central d4 against poor bishop, free pawn c, week pawns on Q side, it is clear advantage in ending without any calculation, at least "close to winning". Ju must have missed 30.Bc4+.
Premium Chessgames Member
  Sally Simpson: This one, starting with 27.Rxe5 does not shout at you 'something here.'

click for larger view

Of course all exchanges should be examined for a twist or a turn but this is an easily missed shot.

Ju Wenjun spent 53 seconds on 27.Bc2.

On move 25 (Bd3) she spent 6 minutes possibly deciding back then the Bishop was going to go to c2.

Jun-02-18  The17thPawn: <goodevans> Thanks for the variation.
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