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Up Topic The Rybka Lounge / Test Positions / Superb play by Zhao Jun at the Chinese Championship
- - By TheWizardOfOz (*) Date 2011-04-12 01:44 Edited 2011-04-12 21:09
An amazing game from Round 9 from the 2011 Chinese Championship.
White: Zhao Jun
Black: Xiu Deshun

Can a computer find 16. Bxd6 !!! ?

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3 b6 7. Bd3 Nc6 8. Ne2 Ba6 9. e4 O-O 10. Bg5 h6 11. Bh4 g5 12. Bg3 d6 13. f4 Na5 14. fxg5 hxg5 15. O-O Nh5  16. Bxd6 Qxd6 17. e5 Qe7 18. Ng3 Nxg3 19. Rf6 Kg7 20. Qg4  Rg8 21. hxg3 Nb7  22. Raf1 Nd8 23.
Qe4 Qb7 24. d5 Rh8  25. Qg6+  fxg6  26. dxe6 26. Rxg6+ Kh7  27. Rxg5+ Kh6 28. Rg6+ Kh7 29.Rg4+ Kh6 30. Rf6+ Kh5 31. Rh4+  1-0
Parent - By dcorbit (***) Date 2011-04-12 20:56
Here is a copy of that game annotated at ChessBase :
http://www.chessbase.com/news/2011/misc/games/chinch02g0.htm
- By hsnksc77 (**) Date 2011-04-12 18:47
Analysis by Houdini 1.5a x64:

16.e5 dxe5 17.Bxe5 f6 18.Bg3 Nxg3 19.Nxg3 cxd4 20.Ne4 Qe7 21.cxd4 Bxc4 22.Bxc4 Nxc4 23.Qc1 f5 24.Qxg5+ Qg7 25.Qxg7+ Kxg7 26.Ng5 Rfe8 27.Rac1
  =  (-0.03)   Depth: 6/24   00:00:00  8kN
16.Nf4
  =  (0.02 !)   Depth: 7/24   00:00:00  8kN
16.e5 dxe5 17.Bxe5 f6 18.Bg3 Nxg3 19.Nxg3 cxd4 20.Ne4 Qe7 21.cxd4 Bxc4 22.Bxc4 Nxc4 23.Qc1 f5 24.Qxg5+ Qg7 25.Qxg7+ Kxg7 26.Ng5 Rfe8 27.Rac1
  =  (-0.03)   Depth: 7/24   00:00:00  10kN
16.Nf4
  =  (0.02 !)   Depth: 8/24   00:00:00  11kN
16.Nf4 Nxg3 17.hxg3 gxf4 18.Qg4+ Kh8 19.Rxf4 e5 20.Qh3+ Kg7 21.Qg4+ Kh8 22.Qh3+
  =  (0.00)   Depth: 8/29   00:00:00  17kN
16.Nf4
  =  (0.06 !)   Depth: 9/29   00:00:00  17kN
16.Nf4 Nxg3 17.hxg3 gxf4 18.Qg4+ Kh8 19.Rxf4 e5 20.Qh5+ Kg7 21.Qg4+ Kh8 22.Qh5+
  =  (0.00)   Depth: 9/29   00:00:00  18kN
16.Nf4
  =  (0.06 !)   Depth: 10/29   00:00:00  19kN
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 cxd4 19.Nf6+ Kg7 20.Nh5+ Kh8 21.Nf6 Kg7 22.Nh5+
  =  (0.00)   Depth: 10/30   00:00:00  39kN
16.Nf4
  =  (0.06 !)   Depth: 11/30   00:00:00  39kN
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 Rc8 19.Nf6+ Kg7 20.Bxc4 Nxc4 21.Nh5+ Kh8 22.Nf6 Kg7 23.Nh5+
  =  (0.00)   Depth: 11/32   00:00:00  75kN
16.Nf4
  =  (0.06 !)   Depth: 12/32   00:00:00  75kN
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 cxd4 19.cxd4 Rc8 20.Nf6+ Kg7 21.Bxc4 Nxc4 22.Nh5+ Kh8 23.Nf6 Kg7 24.Nh5+
  =  (0.00)   Depth: 12/32   00:00:00  200kN
16.Nf4
  =  (0.06 !)   Depth: 13/32   00:00:00  201kN
16.Nf4
  =  (0.19 !)   Depth: 13/44   00:00:00  1316kN
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 cxd4 19.cxd4 b5 20.Nf6+ Kg7 21.Qg4 Rh8 22.Nh5+ Rxh5 23.Qxh5 Qe7 24.Rad1 Rh8 25.Qf3 Bxd3 26.Rxd3
  +/=  (0.31)   Depth: 13/44   00:00:01  3069kN
16.Nf4 Nxg3
  =  (0.25 --)   Depth: 14/44   00:00:01  3293kN
16.Nf4 Nxg3
  =  (0.11 --)   Depth: 14/44   00:00:01  3623kN
16.Nf4 Nxg3 17.hxg3 cxd4 18.Qh5 Bxc4 19.Bxc4 Nxc4 20.Nxe6 fxe6 21.Qg6+ Kh8 22.Qh6+ Kg8 23.Qxe6+ Kg7 24.Qxc4 Qe7 25.Qxd4+ Qe5 26.Qxe5+ dxe5 27.Rfd1 Rac8 28.Rac1 Rf7 29.Rd5 Re7 30.Rd6
  =  (0.15)   Depth: 14/44   00:00:02  5662kN
16.Nf4
  =  (0.22 !)   Depth: 15/44   00:00:04  7927kN
16.Nf4
  +/=  (0.35 !)   Depth: 15/44   00:00:05  11700kN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qxe8 Rfxe8 20.Bxd6 cxd4 21.Rad1 dxc3 22.Bb4 Bxc4 23.Bxc3 Red8 24.Bxc4 Nxc4 25.Bxf6 Rxd1 26.Rxd1 Nxa3 27.Bxg5 Nc4 28.Rd7 a5 29.Kf2 Rf8+ 30.Ke2
  =  (0.20)   Depth: 15/50   00:00:10  21586kN
16.Nf4 Nxf4
  =  (0.13 --)   Depth: 16/50   00:00:12  26239kN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qxe8 Rfxe8 20.Bxd6 Bxc4 21.Rad1 cxd4 22.Bb4 Bxd3 23.Rxd3 Kg7 24.Rxd4 Kg6 25.Rd3 g4 26.Bxa5 bxa5 27.Rd7 Rac8 28.Rf4 Kg5
  =  (0.18)   Depth: 16/50   00:00:15  31544kN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qxe8 Rfxe8 20.Bxd6 Bxc4 21.Rad1 cxd4 22.Bb4 Bxd3 23.Rxd3 Kg7 24.cxd4 Nc4 25.Bc3 a5 26.a4 Rf8 27.d5 e5 28.d6 Rad8 29.d7 Rh8 30.Ba1 Kf7 31.Rc3
  =  (0.16)   Depth: 17/50   00:00:18  39061kN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qxe8 Rfxe8 20.Bxd6 Bxc4 21.Rad1 cxd4 22.Bb4 Bxd3 23.Rxd3 Kg7 24.cxd4 Nc4 25.Bc3 a5 26.a4 Rac8 27.d5
  =  (0.15)   Depth: 18/50   00:00:28  60591kN
16.Nf4
  =  (0.22 !)   Depth: 19/50   00:00:48  105mN
16.Nf4
  +/=  (0.35 !)   Depth: 19/60   00:01:11  154mN
16.Nf4
  +/=  (0.66 !)   Depth: 19/60   00:02:13  291mN
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 f5 19.exf5 cxd4 20.f6 Rf7 21.cxd4 Rc8 22.Bxc4 Nxc4 23.Qg4 Kh8 24.Rac1 d5 25.a4 Qe8 26.Qxg5 Qg8 27.Qh4 Qh7
  +-  (1.41)   Depth: 19/63   00:07:57  1086mN
16.Nf4
  +-  (1.50 !)   Depth: 20/63   00:11:54  1619mN

Analysis by Deep Fritz 11:

16.Qa4 Nxg3 17.Nxg3 Qe8 18.Qc2 Bxc4 19.e5 dxe5 20.dxe5 Rd8 21.Rad1 Bxd3
  =  (-0.02)   Depth: 10/26   00:00:00  379kN
16.Qa4 Nxg3 17.Nxg3 Qe8 18.Qc2 Bxc4 19.e5 dxe5 20.Ne4 f5 21.Nxg5 cxd4 22.cxd4
  =  (-0.21)   Depth: 11/27   00:00:00  873kN
16.Bf2 Bxc4 17.Bxc4 Nxc4 18.Qd3 d5 19.dxc5 Nf6 20.exd5 Qxd5 21.Qxd5 Nxd5 22.c6 Rad8
  =  (-0.13)   Depth: 11/27   00:00:00  1142kN
16.Bf2 Bxc4 17.Bxc4 Nxc4 18.Qd3 d5 19.dxc5 Nf6 20.exd5 Qxd5 21.Bd4 Ne4 22.Ng3 Nxc5
  =  (-0.15)   Depth: 12/27   00:00:00  2622kN
16.Bf2 Bxc4 17.Bxc4 Nxc4 18.Qd3 d5 19.dxc5 Rc8 20.cxb6 axb6 21.exd5 Qxd5 22.Bd4 f5 23.Rad1 Nf6
  =  (-0.03)   Depth: 13/34   00:00:02  7101kN
16.Bf2 Bxc4 17.Bxc4 Nxc4 18.Qd3 d5 19.dxc5 Rc8 20.cxb6 axb6 21.exd5 Qxd5 22.Bd4 f5 23.Rad1 Rfd8 24.Qc2
  =  (-0.02)   Depth: 14/29   00:00:03  10042kN
16.Bf2 Bxc4 17.Bxc4 Nxc4 18.Qd3 d5 19.dxc5 Nf6 20.Ng3 Nd7 21.exd5 Nde5 22.Qe2
  =  (-0.01)   Depth: 15/37   00:00:10  30667kN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qg4 e5 19.Be3 exd4 20.cxd4 Qe7 21.dxc5 Nxc4 22.Bxc4+ Bxc4 23.Rfc1 Bd3 24.Rc3
  +/=  (0.43)   Depth: 15/43   00:00:22  71404kN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qg4 e5 19.Be3 exd4 20.cxd4 Qe7 21.dxc5 Nxc4 22.Bxc4+ Bxc4 23.Rfc1 Bd3
  +/=  (0.43)   Depth: 16/38   00:00:24  78251kN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qg4 e5 19.Be3 exd4 20.cxd4 Qe7 21.dxc5 Nxc4 22.Bxc4+ Bxc4 23.cxd6 Qxd6 24.Rfd1 Qe6
  +/=  (0.34)   Depth: 17/41   00:00:32  103mN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qxe8 Rfxe8 20.Bxd6 cxd4 21.cxd4 Bxc4 22.Rad1 Bxd3 23.Rxd3 Nc4 24.e5 f5
  +/=  (0.34)   Depth: 18/39   00:00:51  164mN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qxe8 Rfxe8 20.Bxd6 cxd4 21.cxd4 Bxc4 22.Rad1 Rad8 23.e5 f5 24.d5
  +/=  (0.36)   Depth: 19/42   00:01:32  300mN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qh6 e5 20.Be3 cxd4 21.cxd4 Qe7 22.dxe5 dxe5 23.Bd2 Qg7
  +/=  (0.33)   Depth: 20/43   00:02:53  568mN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qh6 e5 20.Be3 Qe7 21.Rf5 Qh7 22.Rxf6 Qxh6
  +/=  (0.43)   Depth: 21/43   00:06:02  1199mN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qg4 e5 19.Bd2 cxd4 20.cxd4 Nb3 21.Rad1 Nxd4 22.h4 Qc8 23.Qg3 g4 24.h5 Bxc4
  +/=  (0.31)   Depth: 22/47   00:12:32  2511mN
16.Nf4 Nxf4 17.Bxf4 f6 18.Qg4 e5 19.Bd2 cxd4 20.cxd4 Qe7 21.h4 Nb3 22.hxg5 Qg7 23.Qe6+ Qf7 24.Qxd6
  +/=  (0.36)   Depth: 23/47   00:26:42  5361mN
- - By hsnksc77 (**) Date 2011-04-12 18:48
best move Nh4
Parent - - By TheWizardOfOz (*) Date 2011-04-12 20:03 Edited 2011-04-12 21:08
Hum... If you help the engine by providing the White moves
16. Bd6, and 18.Ng3, it soons appears that the scores are > 1.5 for white...

Nf4 seems to be a nice option. Clearly Black asked for trouble because of his poorly placed pieces on the Q side,
and inferiority on the K side and center.
Parent - - By dcorbit (***) Date 2011-04-13 04:58
In the following EPD positions, the move marked 'bm' is the move that was actually played, and the move marked pm is the computer analysis choice.
Black was still equal at this point and should have played Ne8:
r2q1rk1/p4p2/bp1ppn2/n1p3p1/2PPP3/P1PB2B1/4N1PP/R2Q1RK1 b - - acd 28; bm Nh5; ce 10; pm Ne8;
pv Ne8 Qa4 Rc8 d5 Ng7 dxe6 fxe6 Rxf8+ Qxf8 e5 d5 Bg6 Qe7 cxd5 Bxe2 d6 Qb7 Ra2 Bh5 Bxh5 Nxh5 Qg4 Ng7 Rf2 Rf8 Rxf8+ Kxf8 Qxg5 Nc6 Bf4 Qf7;
Computer analysis suggested Nf4 at this point, but I agree that Bxd6 was a better move:
r2q1rk1/p4p2/bp1pp3/n1p3pn/2PPP3/P1PB2B1/4N1PP/R2Q1RK1 w - - acd 26; bm Bxd6; ce 128; pm Nf4;
pv Nf4 Nxg3 hxg3 Bxc4 Nh5 Bxd3 Nf6+ Kg7 Qxd3 Rh8 Qe3 Kg6 g4 cxd4 cxd4 Nc4 Qd3 Qc7 Rac1 b5 e5+ Kg7 Nh5+ Kg8 Qf3 Rf8 Qf6 Rxh5 gxh5 Qd8 a4 dxe5 dxe5;
Notice that the score for black is worse than the projected score, had the computer suggested key move been made:
r2q1rk1/p4p2/bp1Bp3/n1p3pn/2PPP3/P1PB4/4N1PP/R2Q1RK1 b - - acd 28; bm Qxd6; ce -160; pm Qxd6;
pv Qxd6 e5 Qd8 Ng3 Nxg3 hxg3 Bxc4 Rf6 Kg7 Bh7 cxd4 Qh5 Qxf6 exf6+ Kxf6 cxd4 Nb3 Rd1;
White plays the proper response:
r4rk1/p4p2/bp1qp3/n1p3pn/2PPP3/P1PB4/4N1PP/R2Q1RK1 w - - acd 29; bm e5; ce 180; pm e5;
pv e5 Qd8 Ng3 Nxg3 hxg3 Bxc4 Rf6 Kg7 Bh7 cxd4 Qh5 Qxf6 exf6+ Kxf6 cxd4 Rad8 Rd1 Nb7 Qh6+ Ke7 Qxg5+ f6 Qh6 Nd6 Rc1 Nf7 Qf4 Rc8 Re1 Rh8 Bf5 Ng5 Bg6 Nf7;
Black would have been a little better off to play Qd8 (but not enough to make any difference in the outcome of the game):
r4rk1/p4p2/bp1qp3/n1p1P1pn/2PP4/P1PB4/4N1PP/R2Q1RK1 b - - acd 27; bm Qe7; ce -179; pm Qd8;
pv Qd8 Ng3 Nxg3 hxg3 Bxc4 Rf6 Kg7 Bh7 cxd4 Qh5 Qxf6 exf6+ Kxf6 cxd4 Rad8 Rd1 Nb7 Qh6+ Ke7 Qxg5+ f6 Qh6 Nd6 Rc1 Nf7 Qf4 Rc8 Re1 Rh8 Bf5 Ng5 Bg6 Nf7;
White again plays the correct move:
r4rk1/p3qp2/bp2p3/n1p1P1pn/2PP4/P1PB4/4N1PP/R2Q1RK1 w - - acd 28; bm Ng3; ce 185; pm Ng3;
pv Ng3 Nxg3 Rf6 Bxc4 Bxc4 Nxc4 hxg3 Rfc8 Qh5 Qf8 Raf1 Rc7 Rg6+ fxg6 Rxf8+ Rxf8 Qxg6+ Kh8 Qh6+ Kg8 Qxe6+ Rff7 Qxc4 cxd4 Qxd4 Rfd7 Qe3 Rg7 e6 Rc8 Qe5 Re8;
Black responds with the best response here:
r4rk1/p3qp2/bp2p3/n1p1P1pn/2PP4/P1PB2N1/6PP/R2Q1RK1 b - - acd 28; bm Nxg3; ce -182; pm Nxg3;
pv Nxg3 Rf6 Bxc4 Bxc4 Nxc4 hxg3 Rfc8 Qh5 Qf8 Raf1 Rc7 Rg6+ fxg6 Rxf8+ Rxf8 Qxg6+ Kh8 Qh6+ Kg8 Qxe6+ Rff7 Qxc4 cxd4 Qxd4 Kh7 g4 Rce7 Qd5 Rg7 Qd6 Rd7 Qf6 Rdf7 Qc6 Re7 Qe4+ Rg6;
White again makes the best possible response:
r4rk1/p3qp2/bp2p3/n1p1P1p1/2PP4/P1PB2n1/6PP/R2Q1RK1 w - - acd 27; bm Rf6; ce 239; pm Rf6;
pv Rf6 Kg7 hxg3 Rh8 Qf3 Rad8 Qg4 Kf8 Raf1 Bxc4 Rxf7+ Qxf7 Rxf7+ Kxf7 Qxg5 Ke8 Bxc4 Nxc4 Qg6+ Kd7 Qf7+ Kc6 Qxe6+ Nd6 d5+ Kb5 exd6 Kc4 g4 Kxc3 d7 Kb3 g5 Rhf8 g6 Kxa3 g7 Rg8 Qg4 b5 Kf2 b4 Ke3;
Black should have played Bxc4 instead of Kg7 (but the game would be lost anyway -- it just holds out a bit longer):
r4rk1/p3qp2/bp2pR2/n1p1P1p1/2PP4/P1PB2n1/6PP/R2Q2K1 b - - acd 27; bm Kg7; ce -179; pm Bxc4;
pv Bxc4 hxg3 Bxd3 Qxd3 Nc6 Raf1 Rfd8 Rxf7 Qxf7 Rxf7 Kxf7 Qf3+ Ke7 Qxc6 cxd4 Qb7+ Ke8 cxd4 Rac8 Qxa7 Rxd4 Qxb6 Rd1+ Kf2 Kd7 Qa7+ Kd8 Qg7 Rc2+ Ke3 Rc3+ Ke2 Rd7 Qxg5+ Kc7 Qg6;
White punishes black for the oversight, and it is all over except for the shouting:
r4r2/p3qpk1/bp2pR2/n1p1P1p1/2PP4/P1PB2n1/6PP/R2Q2K1 w - - acd 28; bm Qg4; ce 353; pm hxg3;
pv hxg3 Rh8 Qf3 Rad8 Rf1 Rd7 d5 Bxc4 Bxc4 Nxc4 Qg4 Nxe5 Qxg5+ Ng6 dxe6 Re8 exd7 Qxd7 a4 Re7 a5 bxa5 Qxc5 Qc7 Rc6 Qe5 Qd4 Qxd4+ cxd4 Rd7 Ra6 Rxd4 Rxa5 Rd7 Rfa1 a6 Rxa6 Ne5 Re1 Rd5 Re2 Nd3 Ra7;

A fabulous and instructive game.
Parent - - By TheWizardOfOz (*) Date 2011-04-14 17:16
Which engine did you use...How much time did you let it run ?
Parent - By dcorbit (***) Date 2011-04-14 18:05
I have a database of analyzed chess positions.
Many of them were already analyzed in the past.
The engine would have been one of:
Stockfish, Rybka, Houdini
You can tell an approximation of the time by examaination of the depth of search (acd field).
Up Topic The Rybka Lounge / Test Positions / Superb play by Zhao Jun at the Chinese Championship

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