Zhao Jun-Xiu Deshun, Chinese Chmp. 2011

[jdart]

see http://chessbase.com/newsdetail.asp?newsid=7140.

The initial sac Bxd6 looks very difficult even for computers:

[D] r2q1rk1/p4p2/bp1pp3/n1p3pn/2PPP3/P1PB2B1/4N1PP/R2Q1RK1 w - -

Ng3 here is a nice test position, a bit easier:

[D] r4rk1/p3qp2/bp2p3/n1p1P1pn/2PP4/P1PB4/4N1PP/R2Q1RK1 w - -

[AdminX]

Yeah, that sac was nice!


[Event "ch-CHN 2011"]
[Site "Xinghua Jiangsu CHN"]
[Date "2011.04.08"]
[Round "9"]
[White "Zhao Jun"]
[Black "Xiu Deshun"]
[Result "1-0"]
[ECO "E26"]
[WhiteElo "2580"]
[BlackElo "2508"]
[PlyCount "61"]
[EventDate "2011.03.30"]

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 {Whether now or after White plays e5, g5
will have to be played, so Black decides to get it out of the way.} 12. Bg3 d6
13. f4 Na5 14. fxg5 hxg5 15. O-O Nh5 {#} 16. Bxd6 $3 {The sheer imagination
and depth are flabbergasting.} Qxd6 17. e5 Qe7 18. Ng3 $1 {This seemingly
innocuous move is in fact a deflection and not an exchange!} Nxg3 {#} 19. Rf6
$3 {Down two pieces, White ensures the kingside remains cut off with this move.
} (19. hxg3 $6 f5 {and the attack is harder to conduct.}) 19... Kg7 {#} (19...
Bxc4 {to try and take some of the steam out of White's attack by exchanging
pieces, doesn't quite do it.} 20. hxg3 Bxd3 21. Qxd3 {The problem is that
White still has a myriad of threats, whether the simplistic Qd2-Qxg5, to Raf1
with queen or even a d5 thrust if called for.} {A sample line might go} Kg7 22.
Qe3 Rh8 23. Raf1 Rag8 24. Qxg5+ Kf8 25. Rxf7+ Qxf7 26. Rxf7+ Kxf7 27. Qf6+ Ke8
28. Qxe6+ Kd8 29. d5 $1) 20. Qg4 $1 {Black isn't given a moment's respite.} Rg8
21. hxg3 Nb7 {Desperately trying to bring some support for f7} 22. Raf1 Nd8 23.
Qe4 Qb7 24. d5 Rh8 {#} 25. Qg6+ $3 {Just incredible.} fxg6 ({If} 25... Kf8 {
then} 26. dxe6 {and there is no defense against Rxf7+.}) 26. Rxg6+ Kh7 {The
final windmill is an inescapable mating net.} 27. Rxg5+ Kh6 28. Rg6+ Kh7 29.
Rg4+ Kh6 30. Rf6+ Kh5 31. Rh4+ {The next move is mate.} 1-0

[Jouni]

Nice game. All moves after 16.Bxd6 are easy for top engines. But Critter has another move in mind for:

Analysis by Critter 1.01 64-bit:

16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qxe8 Rfxe8 20.Bxd6 Bxc4 21.Rad1 cxd4 22.Bb4 Rac8 23.Rxf6 Bb3 24.Rc1 Bc4 25.Bxc4 Rxc4 26.Rg6+ Kh7 27.Rxg5 Nc6 28.Rf1 Nxb4 29.cxb4 Rc3 30.Rf7+ Kh6 31.Rfg7 Rc1+
+/- (1.32) Depth: 20/78 00:29:02 4111mN, tb=27
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 f6 19.Bxc4 Nxc4 20.Qg4 f5 21.Qe2 b5 22.exf5 e5 23.dxe5 Nxe5 24.Rad1 b4 25.Qa2+ c4 26.axb4 a5 27.b5 Rb8 28.Rd5 Qb6+ 29.Kh1 Qe3 30.f6 Qxc3 31.Qf2 Rb7
+- (1.55) Depth: 20/83 00:46:22 6806mN, tb=566
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 f6 19.Bxc4 Nxc4 20.Qg4 f5 21.Qe2 b5 22.exf5 e5 23.dxe5 Nxe5 24.Rad1 b4 25.Qa2+ c4 26.axb4 a5 27.b5 Rb8 28.Rd5 Qb6+ 29.Kh1 Qe3 30.f6 Qxc3 31.Qf2 Rb7
+- (1.64) Depth: 21/83 01:01:29 9146mN, tb=569
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 f6 19.Bxc4 Nxc4 20.Qg4 f5 21.Qe2 b5 22.exf5 e5 23.dxe5 Nxe5 24.Rad1 Rf7 25.Qxb5 Qe7 26.f6 Qe6 27.Qb1 Re8 28.Qc1 Qg4 29.Ng7 Rd8 30.Rf5 Rxf6 31.Rxf6 Kxg7
+- (1.69) Depth: 21/83 01:15:16 11255mN, tb=569
16.Nf4 Nxg3 17.hxg3 e5 18.dxe5 dxe5 19.Nh5 f6 20.Qf3 Kh8 21.Qf5 Qe7 22.Nxf6 Rxf6 23.Qxf6+ Qxf6 24.Rxf6 Rd8 25.Be2 Kg7 26.Rf5 Rd2 27.Bf1 Bxc4 28.Rxe5 Rc2 29.Rxg5+ Kh6 30.Rf5 Rxc3 31.g4 Rg3
+- (1.64) Depth: 22/83 01:37:28 14763mN, tb=569

Jouni

[Eelco de Groot]

Nice game. All moves after 16.Bxd6 are easy for top engines. But Critter has another move in mind for:

Analysis by Critter 1.01 64-bit:

16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qe8 19.Qxe8 Rfxe8 20.Bxd6 Bxc4 21.Rad1 cxd4 22.Bb4 Rac8 23.Rxf6 Bb3 24.Rc1 Bc4 25.Bxc4 Rxc4 26.Rg6+ Kh7 27.Rxg5 Nc6 28.Rf1 Nxb4 29.cxb4 Rc3 30.Rf7+ Kh6 31.Rfg7 Rc1+
+/- (1.32) Depth: 20/78 00:29:02 4111mN, tb=27
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 f6 19.Bxc4 Nxc4 20.Qg4 f5 21.Qe2 b5 22.exf5 e5 23.dxe5 Nxe5 24.Rad1 b4 25.Qa2+ c4 26.axb4 a5 27.b5 Rb8 28.Rd5 Qb6+ 29.Kh1 Qe3 30.f6 Qxc3 31.Qf2 Rb7
+- (1.55) Depth: 20/83 00:46:22 6806mN, tb=566
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 f6 19.Bxc4 Nxc4 20.Qg4 f5 21.Qe2 b5 22.exf5 e5 23.dxe5 Nxe5 24.Rad1 b4 25.Qa2+ c4 26.axb4 a5 27.b5 Rb8 28.Rd5 Qb6+ 29.Kh1 Qe3 30.f6 Qxc3 31.Qf2 Rb7
+- (1.64) Depth: 21/83 01:01:29 9146mN, tb=569
16.Nf4 Nxg3 17.hxg3 Bxc4 18.Nh5 f6 19.Bxc4 Nxc4 20.Qg4 f5 21.Qe2 b5 22.exf5 e5 23.dxe5 Nxe5 24.Rad1 Rf7 25.Qxb5 Qe7 26.f6 Qe6 27.Qb1 Re8 28.Qc1 Qg4 29.Ng7 Rd8 30.Rf5 Rxf6 31.Rxf6 Kxg7
+- (1.69) Depth: 21/83 01:15:16 11255mN, tb=569
16.Nf4 Nxg3 17.hxg3 e5 18.dxe5 dxe5 19.Nh5 f6 20.Qf3 Kh8 21.Qf5 Qe7 22.Nxf6 Rxf6 23.Qxf6+ Qxf6 24.Rxf6 Rd8 25.Be2 Kg7 26.Rf5 Rd2 27.Bf1 Bxc4 28.Rxe5 Rc2 29.Rxg5+ Kh6 30.Rf5 Rxc3 31.g4 Rg3
+- (1.64) Depth: 22/83 01:37:28 14763mN, tb=569

Jouni

Yes, that is the move I get too. Bxd6 is nowhere in sight so I think Rainbow Serpent just misses it. I started the program up this morning, with no further interruptions the output is after almost ten hours, with iteration 30 not yet ready:


[D]r2q1rk1/p4p2/bp1pp3/n1p3pn/2PPP3/P1PB2B1/4N1PP/R2Q1RK1 w - -

Engine: Rainbow Serpent 2.0 Build 118 (Athlon 2009 MHz, 256 MB)
by Romstad, Costalba, Kiiski

1/01 0:01 +0.36 1.Qa4 (3.511) 3

2/11 0:01 +0.32 1.Qa4 Qc7 2.Rac1 Nxg3 3.Nxg3 Qc6
4.Qd1 Bxc4 5.Bxc4 Nxc4 6.Qh5 (248.289) 154

3/08 0:02 -0.16 1.Qa4 Nxg3 2.Nxg3 Qe8 3.Qxe8 Raxe8
4.Nh5 f5 (477.475) 233

4/13 0:02 -0.16 1.Qa4 Nxg3 2.Nxg3 Qe8 3.Qd1 Bxc4
4.Bxc4 Nxc4 5.Qh5 f6 6.Qh6 cxd4
7.Nh5 (531.908) 246

5/13 0:02 -0.17 1.Qa4 Nxg3 2.Nxg3 Qe8 3.Qd1 Bxc4
4.Bxc4 Nxc4 5.Qh5 f6 6.Qh6 cxd4
7.Nh5 (601.179) 261

6/13 0:02 0.00++ 1.Qa4 Nxg3 2.Nxg3 Qe8 3.Qd1 Bxc4
4.Bxc4 Nxc4 5.Qh5 f6 6.Qh6 cxd4
7.Nh5 (712.778) 285

6/17 0:02 -0.16 1.Qa4 Nxg3 2.Nxg3 Qe8 3.Qd1 Bxc4
4.Bxc4 Nxc4 5.Qh5 Qe7 6.Qh6 cxd4
7.cxd4 f5 8.Qg6+ Kh8 9.exf5 (751.181) 291

7/13 0:02 -0.16 1.Qa4 Nxg3 2.Nxg3 Qe8 3.Qd1 Bxc4
4.Bxc4 Nxc4 5.Qh5 f6 6.Qh6 cxd4
7.Nh5 (767.707) 294

8/13 0:02 -0.12++ 1.Qa4 Nxg3 2.Nxg3 Qe8 3.Qd1 Bxc4
4.Bxc4 Nxc4 5.Qh5 f6 6.Qh6 cxd4
7.Nh5 (806.455) 300

8/17 0:02 -0.08++ 1.Qa4 Nxg3 2.Nxg3 cxd4 3.cxd4 d5
4.exd5 exd5 5.Nf5 dxc4 6.Be4 c3
7.Bxa8 Bxf1 8.Rxf1 Qxa8 9.Qc2 (914.163) 316

8/17 0:03 0.00++ 1.Qa4 Nxg3 2.Nxg3 cxd4 3.cxd4 d5
4.exd5 exd5 5.Nf5 dxc4 6.Be4 c3
7.Bxa8 Bxf1 8.Rxf1 Qxa8 9.Qc2 (1.167.179) 345

8/19 0:04 -0.10 1.Qa4 cxd4 2.cxd4 d5 3.exd5 exd5
4.Be5 f6 5.Bg6 fxe5 6.Bxh5 dxc4
7.Rxf8+ Qxf8 8.Rf1 Qb8 9.dxe5 Qxe5
10.Qc2 (1.701.388) 390

9/12 0:05 -0.19-- 1.Qa4 Rc8 2.Rac1 Nxg3 3.Nxg3 Qe8
4.Qxe8 Rcxe8 5.Nh5 f5 6.exf5 Bxc4 (2.455.110) 422

9/15 0:06 -0.33-- 1.Qa4 Rc8 2.d5 Nxg3 3.Nxg3 Qe8 4.Qd1 Bxc4
5.Qh5 Qe7 6.Bxc4 Nxc4 7.Qh6 exd5
8.Nh5 (2.730.082) 432

9/17 0:06 -0.15++ 1.Qa4 Rc8 2.d5 Nxg3 3.Nxg3 Qe8 4.Qd1 Bxc4
5.Qh5 Bxd3 6.Qxg5+ Kh8 7.Qh5+ Kg7
8.Qg5+ Kh7 9.Rf6 (2.825.603) 435

9/15 0:07 -0.16 1.Qa4 Rc8 2.d5 Qe7 3.Rf2 Nxg3 4.Nxg3 Qe8
5.Qd1 Bxc4 6.Bxc4 Nxc4 7.Qh5 f6
8.Qh6 (3.116.324) 442

10/12 0:09 -0.28-- 1.Qa4 cxd4 2.cxd4 d5 3.exd5 exd5
4.Be5 f6 5.Ng3 fxe5 6.Nxh5 Bxc4 (4.533.222) 467

10/17 0:09 -0.10++ 1.Qa4 cxd4 2.cxd4 Nxg3 3.Nxg3 d5
4.exd5 exd5 5.Nf5 dxc4 6.Be4 c3
7.Nh6+ Kg7 8.Nf5+ Kh7 9.Rfc1 (4.620.738) 468

10/19 0:10 -0.32 1.Qa4 cxd4 2.cxd4 d5 3.exd5 exd5
4.Be1 Bxc4 5.Qc2 Qe7 6.Bxc4 Nxc4
7.Bb4 Nd6 8.Bxd6 Qxd6 9.Qf5 Qe7
10.Qf3 (5.001.231) 472

11/11 0:10 -0.24 1.Qa4 cxd4 2.cxd4 d5 3.exd5 exd5
4.Be1 Qe8 5.Qc2 Nxc4 6.Qc1 (5.190.211) 474

12/19 0:11 -0.24 1.Qa4 cxd4 2.cxd4 d5 3.exd5 exd5
4.Be1 Bxc4 5.Qc2 Qe7 6.Rf2 Bxd3
7.Qxd3 Rfe8 8.Bb4 Qe4 9.Qh3 Qh7
10.Qf3 (5.647.625) 478

13/14 0:12 -0.16++ 1.Qa4 cxd4 2.cxd4 d5 3.exd5 exd5
4.Be1 dxc4 5.Be4 Rc8 6.Bf5 Rb8 7.Bb4 Re8 (6.050.121) 480

13/14 0:14 -0.16 1.Qa4 cxd4 2.cxd4 d5 3.exd5 exd5
4.Qc2 Nxg3 5.Nxg3 dxc4 6.Bh7+ Kh8
7.d5 Qxd5 (6.805.094) 483

14/17 0:16 -0.16 1.Qa4 cxd4 2.cxd4 d5 3.exd5 exd5
4.Be1 dxc4 5.Bb1 Qe8 6.Qc2 Qe3+
7.Rf2 Qd3 8.Bxa5 bxa5 9.Qc1 (7.955.542) 486

15/16 0:26 -0.24-- 1.Qa4 Rc8 2.d5 exd5 3.exd5 Qe8
4.Qxe8 Rfxe8 5.Bxd6 Bxc4 6.Bxc4 Nxc4
7.Ng3 Nxg3 8.Bxg3 Ne3 (12.928.157) 495

15/16 0:29 -0.32-- 1.Qa4 Rc8 2.d5 exd5 3.exd5 Qe8
4.Qxe8 Rfxe8 5.Bxd6 Bxc4 6.Bxc4 Nxc4
7.Ng3 Nxg3 8.Bxg3 Ne3 (14.564.648) 499

15/13 0:33 -0.37 1.Qa4 Rc8 2.d5 exd5 3.exd5 Qe8 4.Qc2 Bxc4
5.Bh7+ Kh8 6.Rae1 Bxd5 7.Nf4 (16.802.748) 499

16/18 0:57 -0.47 1.Qa4 Rc8 2.Rac1 f6 3.h3 cxd4 4.cxd4 d5
5.exd5 exd5 6.Be1 Bxc4 7.Bxc4 Nxc4
8.Qxa7 Qe8 9.Nc3 Nf4 (28.836.947) 501

17/18 1:27 -0.52 1.Qa4 Rc8 2.Rac1 f6 3.h3 cxd4 4.cxd4 d5
5.exd5 exd5 6.Be1 Bxc4 7.Bf5 Qe8
8.Qc2 Nb3 9.Bh7+ Kh8 (43.815.431) 502

18/22 2:55 -0.59 1.Qa4 Rc8 2.Rac1 f6 3.h3 cxd4 4.cxd4 d5
5.exd5 exd5 6.Bf2 Bxc4 7.Bf5 Rc7
8.Be6+ Kg7 9.Bg4 Rh8 10.Qc2 Qe8
11.Qf5 Re7 (88.113.373) 503

18/09 3:31 -0.36++ 1.Nf4 Nxg3 2.hxg3 cxd4 3.Qh5 gxf4
4.Rxf4 dxc3 5.Rg4+ (106.448.218) 503

18/09 3:36 -0.20++ 1.Nf4 Nxg3 2.hxg3 cxd4 3.Qh5 gxf4
4.Rxf4 dxc3 5.Rg4+ (109.066.302) 504

18/09 3:51 +0.12++ 1.Nf4 Nxg3 2.hxg3 cxd4 3.Qh5 gxf4
4.Rxf4 dxc3 5.Rg4+ (117.123.136) 505

18/17 4:33 +0.55 1.Nf4 Nxg3 2.hxg3 Qe7 3.e5 Bxc4
4.Nh5 Bxd3 5.Qxd3 f5 6.exf6 Qf7
7.Qf3 Nb3 8.Rad1 cxd4 9.cxd4 (139.275.616) 509

19/17 5:16 +0.48 1.Nf4 Nxg3 2.hxg3 cxd4 3.Qh5 Bxc4
4.Bxc4 Nxc4 5.Nxe6 fxe6 6.Qg6+ Kh8
7.Qh6+ Kg8 8.Qxe6+ Kg7 9.Qxc4 (161.361.099) 510

20/10 5:34 +0.44 1.Nf4 Nxg3 2.hxg3 cxd4 3.Qh5 Bxc4
4.Bxc4 Nxc4 5.Nxe6 fxe6 (170.748.245) 510

21/34 6:01 +0.32 1.Nf4 Nxg3 2.hxg3 cxd4 3.Qh5 Bxc4
4.Bxc4 Nxc4 5.Nxe6 fxe6 6.Qg6+ Kh8
7.Qh6+ Kg8 8.Qxe6+ Kg7 9.Qxc4 dxc3
10.Qxc3+ Kh6 11.Rxf8 Qxf8 12.Rf1 Qe7
13.Qf6+ Qxf6 14.Rxf6+ (184.585.491) 510

22/15 7:04 +0.48++ 1.Nf4 Nxg3 2.hxg3 cxd4 3.Nh5 f6
4.cxd4 Bxc4 5.Bxc4 Nxc4 6.Qc1 Rc8
7.Rxf6 Rxf6 8.Qxg5+ (217.805.608) 512

22/29 11:38 +0.24-- 1.Nf4 Nxf4 2.Bxf4 f6 3.Qh5 Qe8
4.Qxe8 Rfxe8 5.Bxd6 cxd4 6.cxd4 Bxc4
7.Rad1 Kg7 8.e5 f5 9.d5 Bxd5 10.Bxf5 Nc4
11.Bg4 Nxd6 12.exd6 Red8 13.Rf2 Rxd6
14.Bxe6 (361.312.800) 517

22/22 12:47 +0.08 1.Nf4 Nxf4 2.Bxf4 f6 3.Qh5 Qe8
4.Qxe8 Rfxe8 5.Bxd6 cxd4 6.cxd4 Bxc4
7.Rad1 Kg7 8.Bb4 Rac8 9.Bc3 Rf8
10.Rf3 Bxd3 11.Rdxd3 g4 (397.941.284) 518

23/16 14:35 +0.16 1.Nf4 Nxf4 2.Bxf4 f6 3.Qh5 Qe8
4.Qxe8 Rfxe8 5.Bxd6 cxd4 6.cxd4 Bxc4
7.Rad1 Kg7 8.Bb4 Rac8 (454.906.060) 519

24/09 19:37 +0.39 1.Nf4 Nxf4 2.Bxf4 f6 3.Qh5 Qe8 4.Qh6 e5
5.Be3 (613.307.958) 520

25/14 45:25 +0.75 1.Nf4 Nxf4 2.Bxf4 f6 3.Qh5 Qe8 4.Qh6 e5
5.Bxg5 fxg5 6.Qxg5+ Kh8 7.dxc5 dxc5 (1.430.303.892) 524

26/26 78:30 +1.22 1.Nf4 Nxg3 2.hxg3 Bxc4 3.Nh5 Bxd3
4.Nf6+ Kg7 5.Qxd3 Rh8 6.Rf2 cxd4
7.Raf1 Nc6 8.cxd4 a6 9.Qe3 Kf8 10.d5 exd5
11.Nxd5 Ne5 12.Nxb6 Ra7 13.Nd5 Rb7 (2.479.303.459) 526

27/19 127:33 +1.34 1.Nf4 Nxf4 2.Bxf4 f6 3.Qh5 Qe8 4.Qh6 Bxc4
5.Rad1 Rd8 6.e5 Bxd3 7.Rxd3 Qe7
8.Rh3 gxf4 9.Rxf4 Qg7 10.Rg4 (4.030.420.182) 526

28/27 190:15 +1.32 1.Nf4 Nxg3 2.hxg3 Bxc4 3.Nh5 Bxd3
4.Nf6+ Kg7 5.Qxd3 Qxf6 6.Rxf6 Kxf6
7.dxc5 dxc5 8.Qd7 Nc4 9.Rf1+ Kg6
10.Qe7 f6 11.Qxe6 Ne5 12.a4 Rae8
13.Qd6 Rf7 14.a5 (6.031.094.219) 528

29/07 280:15 +1.52 1.Nf4 Nxg3 2.hxg3 Bxc4 3.Nh5 f5
4.Bxc4 (8.881.262.775) 528

[Albert Silver]

Yeah, that sac was nice!

I have no issue posting my notes (unsigned it is true), but at least credit Chessbase.com where you got them.

[jdart]

I haven't done a deep analysis so it is possible the initial sac Bxd6 isn't actually the best move .. maybe Black had a better move somewhere. But by move 18 Black is toast.

--Jon

[Albert Silver]

I haven't done a deep analysis so it is possible the initial sac Bxd6 isn't actually the best move .. maybe Black had a better move somewhere. But by move 18 Black is toast.

--Jon

Well, here's the thing, I can't get an engine to find Bxd6 either, but I did push the major defensive tries by the engines (Houdini and Critter notably), and eventually they were all busted, with greater advantages than the Nf4 line. On the other hand I didn't analyze the Nf4 very deeply, since the Bxd6 variations all led to greater than +2. Note also that I did *not* publish all my analysis in the article. In fact, I almost never do.

Although the engines don't see the issue with Bxd6 and play Nf4 simply because they think Bxd6 loses, perhaps Black's best chance is simply to decline the sacrifice and play Nxc4 Bxc4 Bxc4 Bxf8 and try to survive the exchange down. Since the rooks are so strong still, I think this is a technical win for White, but as far as alternatives are concerned, I think it might be Black's best chance.

[ernest]

I haven't done a deep analysis so it is possible the initial sac Bxd6 isn't actually the best move

Analysis of move 16, after 21 hours (on dual-core), at beginning of depth 28:
Analysis by Houdini 1.5a w32 gtb:

1. +- (2.07): 16.Bxd6 Nxc4 17.Nc1 Nxd6 18.Qxh5 c4 19.Bb1 Kg7 20.e5 Rh8 21.Qf3 Bb7 22.Qe3 Ne8 23.Ra2 Rc8 24.Raf2 Rc7 25.Ne2 Kg8 26.Ng3 b5 27.Ne4 Bxe4 28.Bxe4 Rh5 29.Bc2 a5 30.Rb1 g4 31.Qf4 Qg5 32.Rxb5 Qxf4 33.Rxf4
2. +- (2.04): 16.Nf4 Nxf4 17.Bxf4 f6 18.Qh5 Qd7 19.Bxd6 Rf7 20.dxc5 bxc5 21.Rad1 Rh7 22.Qf3 Rf7 23.e5 Bb7 24.Qf2 f5 25.Qxc5 Qc6 26.Qxc6 Bxc6 27.Rb1 Rh7 28.c5 g4 29.Rb4 Rc8 30.Ba6

[Eelco de Groot]

I haven't done a deep analysis so it is possible the initial sac Bxd6 isn't actually the best move .. maybe Black had a better move somewhere. But by move 18 Black is toast.

--Jon

Hi Jon,

I had not really paid attention that you were replying to me here. Probably Bxd6 is best and the engines see it is winning if you make the move on the board, but Black has too much compensation if you do not also make the next 18.Ng3 -deflection, not an exchange in Albert's words- if the engine does not see this on shorter searches the lack of compensation for the material means more futility pruning so in the nullwindow search this is really hard to find. Maybe there is some Zugzwang involved too I would not know. But Nf4 is good too! Strangely, Houdini seems to do without Ng3 Nxg3 on the 17th or 18th move, maybe the PV would be higher with those moves included.

The 10 hour search ended with

30/05 599:38 +1.27-- 1.Nf4 Nxf4 2.Bxf4 f6 3.Qg4 (19.090.404.497) 530

best move: Ne2-f4 time: 652:34.891 min n/s: 530.001 nodes: 20.752.065.265

So a Fail Low at 30 plies but possibly a Fail High would follow if I had not stopped the search. I will also post the output from Tommy Cooper for the fans This is not the Tommy Cooper I posted about but as I started to tackle the evaluation function after long experiments with search, I thought the version with changes in evaluate.cpp could be called Tommy Cooper for the moment, to distinguish it from Rainbow Serpent which practically has very similar evaluation to Stockfish. In a few hours, I hope it will do as good as Rainbow Serpent

Eelco

[Dann Corbit]

I haven't done a deep analysis so it is possible the initial sac Bxd6 isn't actually the best move .. maybe Black had a better move somewhere. But by move 18 Black is toast.

--Jon

Well, here's the thing, I can't get an engine to find Bxd6 either, but I did push the major defensive tries by the engines (Houdini and Critter notably), and eventually they were all busted, with greater advantages than the Nf4 line. On the other hand I didn't analyze the Nf4 very deeply, since the Bxd6 variations all led to greater than +2. Note also that I did *not* publish all my analysis in the article. In fact, I almost never do.

Although the engines don't see the issue with Bxd6 and play Nf4 simply because they think Bxd6 loses, perhaps Black's best chance is simply to decline the sacrifice and play Nxc4 Bxc4 Bxc4 Bxf8 and try to survive the exchange down. Since the rooks are so strong still, I think this is a technical win for White, but as far as alternatives are concerned, I think it might be Black's best chance.

Some analysis I did:
http://rybkaforum.net/cgi-bin/rybkaforu ... ?tid=21561

Here are all of the EPD records for the game:

Code: Select all

r1bqk2r/p2p1ppp/1pn1pn2/2p5/2PP4/P1PBP3/4NPPP/R1BQK2R b KQkq - acd 29; pm O-O; ce 19; pv O-O e4 d6 O-O Ba6 Qc2 Rc8 Rd1 h6 d5 exd5 cxd5 c4 Bxc4 Bxc4 dxc6 Bxe2 Qxe2 Qe8 f3 Qxc6 Qd2 Rfd8 Bb2 Qc4 a4 Qe6 Qd4 d5 e5 Nd7 f4;
r1bqk2r/p2p1ppp/1pn1pn2/2p5/2PP4/P1PBP3/5PPP/R1BQK1NR w KQkq - acd 29; pm Nf3; ce 12; pv Nf3 O-O O-O d6 Re1 Qe7 e4 e5 d5 Na5 Bg5 h6 Bh4 Bg4 Rb1 Rac8 Rb2 Rc7 h3 Bh5 Qe2 Rd7 Bg3 Rdd8 Qd1 Rb8 Bh4;
r2n2r1/p3qpk1/bp2pR2/2p1P1p1/2PP2Q1/P1PB2P1/6P1/5RK1 w - - acd 30; pm d5; ce 1254; pv d5 Kf8 d6 Qxf6 exf6 Ke8 Be4 Kd7 Bxa8 Bb7 Bxb7 Nxb7 Rd1 Rd8 Qh5 Rf8 Qxg5 Re8 Qg7 Nd8 Kf2 a5 Rb1;
r2n2r1/p3qpk1/bp2pR2/2p1P1p1/2PPQ3/P1PB2P1/6P1/5RK1 b - - acd 29; pm Rh8; ce -709; pv Rh8 d5 Bc8 d6 Qd7 Rg6+ Kf8 Rxg5 Qb7 Qg6 Ke8 Qf6 Rf8 Be4 Qd7 Bxa8 Bb7 Bxb7 Nxb7 Qg7 Qa4 Rh5;
r2n2r1/pq3pk1/bp2pR2/2p1P1p1/2PPQ3/P1PB2P1/6P1/5RK1 w - - acd 27; pm Qh7+; ce 2259; pv Qh7+ Kf8 d5 Rg7 Qh8+ Rg8 Qh6+ Ke8 dxe6 Rf8 Bg6 Bxc4 Bxf7+ Nxf7 Rxf7 Qxf7 exf7+ Rxf7 Qc6+ Ke7 Qb7+ Kf8 Qxa8+ Kg7 Rxf7+ Kxf7 Qxa7+ Ke8 Qxb6 Be2 Qe6+ Kd8 Kf2 Bh5 Qf6+ Kd7 Qg7+ Ke6 Qh6+ Kxe5 Qxg5+ Kd6 Qxh5 Kc6 g4;
r2n2r1/pq3pk1/bp2pR2/2pPP1p1/2P1Q3/P1PB2P1/6P1/5RK1 b - - acd 28; pm Kf8; ce -2215; pv Kf8 Qh7 Rg7;
r2n3r/pq3pk1/bp2pR2/2pPP1p1/2P1Q3/P1PB2P1/6P1/5RK1 w - - acd 29; pm Qg6+; ce 32750; pv Qg6+ Kf8 dxe6 Qxg2+ Kxg2 Bb7+ R1f3 Bxf3+ Rxf3 Rh2+ Kxh2 f5 Rxf5+ Ke7 Qf6+ Ke8 Qf8#;
r2n3r/pq3pk1/bp2pRQ1/2pPP1p1/2P5/P1PB2P1/6P1/5RK1 b - - acd 30; pm Kf8; ce -32751; pv Kf8 dxe6 Qxg2+ Kxg2 Bb7+ R1f3 Bxf3+ Rxf3 Rh2+ Kxh2 Ke7 Rxf7+ Nxf7 Qxf7+ Kd8 Qd7#;
r2n3r/pq4k1/bp2p1R1/2pPP1p1/2P5/P1PB2P1/6P1/5RK1 b - - acd 32; pm Kh7; ce -32755; pv Kh7 Rxg5+ Kh6 Rg6+ Kh7 Rg4+ Kh6 Rf6+ Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq4k1/bp2pRp1/2pPP1p1/2P5/P1PB2P1/6P1/5RK1 w - - acd 32; pm Rxg6+; ce 32754; pv Rxg6+ Kh7 Rxg5+ Kh6 Rg6+ Kh7 Rg4+ Kh6 Rf6+ Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq5k/bp2p1R1/2pPP1p1/2P5/P1PB2P1/6P1/5RK1 w - - acd 32; pm Rxg5+; ce 32756; pv Rxg5+ Kh6 Rg6+ Kh7 Rg4+ Kh6 Rf6+ Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq5k/bp2p1R1/2pPP3/2P5/P1PB2P1/6P1/5RK1 w - - acd 32; pm Rg4+; ce 32760; pv Rg4+ Kh6 Rf6+ Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq5k/bp2p3/2pPP1R1/2P5/P1PB2P1/6P1/5RK1 b - - acd 33; pm Kh6; ce -32757; pv Kh6 Rg6+ Kh7 Rg4+ Kh6 Rf6+ Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq5k/bp2p3/2pPP3/2P3R1/P1PB2P1/6P1/5RK1 b - - acd 33; pm Kh6; ce -32761; pv Kh6 Rf6+ Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq6/bp2p1Rk/2pPP3/2P5/P1PB2P1/6P1/5RK1 b - - acd 32; pm Kh7; ce -32759; pv Kh7 Rg4+ Kh6 Rf6+ Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq6/bp2p2k/2pPP1R1/2P5/P1PB2P1/6P1/5RK1 w - - acd 32; pm Rg6+; ce 32758; pv Rg6+ Kh7 Rg4+ Kh6 Rf6+ Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq6/bp2p2k/2pPP3/2P3R1/P1PB2P1/6P1/5RK1 w - - acd 33; pm Rf6+; ce 32762; pv Rf6+ Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq6/bp2pR1k/2pPP3/2P3R1/P1PB2P1/6P1/6K1 b - - acd 39; pm Kh5; ce -32763; pv Kh5 Rh4+ Kg5 Rg6#;
r2n3r/pq6/bp2pR2/2pPP2k/2P3R1/P1PB2P1/6P1/6K1 w - - acd 57; pm Rh4+; ce 32764; pv Rh4+ Kg5 Rg6#;
r2n3r/pq6/bp2pR2/2pPP2k/2P4R/P1PB2P1/6P1/6K1 b - - acd 64; pm Kg5; ce -32765; pv Kg5 Rg6#;
r2q1rk1/p2p1p2/bpn1pn1p/2p3p1/2PPP2B/P1PB4/4NPPP/R2QK2R w KQ - acd 30; pm Bg3; ce 77; pv Bg3 d6 h4 e5 Qd2;
r2q1rk1/p2p1p2/bpn1pn1p/2p3p1/2PPP3/P1PB2B1/4NPPP/R2QK2R b KQ - acd 28; pm d6; ce -77; pv d6 h4 e5 Qd2 Ne8 hxg5 hxg5 O-O-O Na5 Kb1 f6 Qa2 Qd7 a4 Kg7 d5 Rh8 Rxh8 Kxh8 Rh1+ Kg7 Bh2 Nc7 Ng3 Rh8 Nf5+ Kg8 Be2 Rh7 Kc1;
r2q1rk1/p2p1pp1/bpn1pn1p/2p3B1/2PPP3/P1PB4/4NPPP/R2QK2R w KQ - acd 27; pm Bh4; ce 0; pv Bh4 Na5 e5 g5 Bg3 Nh5 Ng1 Nf4 Bxf4 gxf4 Nf3 cxd4 Qc1 f5 Qxf4 Bxc4 Bxc4 Nxc4 Qxh6 dxc3 Qg6+ Kh8 Qh6+ Kg8;
r2q1rk1/p2p1pp1/bpn1pn1p/2p5/2PPP2B/P1PB4/4NPPP/R2QK2R b KQ - acd 28; pm Na5; ce -16; pv Na5 e5 g5 Bg3 Nh5 h4 f5 hxg5 Nxg3 Nxg3 Qxg5 Rh3 Kh8 dxc5 Nc6;
r2q1rk1/p2p1ppp/bpn1pn2/2p3B1/2PPP3/P1PB4/4NPPP/R2QK2R b KQ - acd 27; pm h6; ce -22; pv h6 Bh4 Na5 dxc5 bxc5 e5 g5 Bg3 Nh5 h4 Bxc4 hxg5 Nxg3 Nxg3 Qxg5 Ne4 Qxe5 Qg4+;
r2q1rk1/p2p1ppp/bpn1pn2/2p5/2PPP3/P1PB4/4NPPP/R1BQK2R w KQ - acd 27; pm e5; ce 0; pv e5 Ne8 Qa4 Na5 dxc5 f6 Bf4 fxe5 Bxe5 Qg5 Bd4 e5 f4 Qxg2 Rg1 Qf3 Rg3 Qh1+ Rg1 Qf3;
r2q1rk1/p4p2/bp1Bp3/n1p3pn/2PPP3/P1PB4/4N1PP/R2Q1RK1 b - - acd 28; pm Qxd6; ce -160; pv Qxd6 e5 Qd8 Ng3 Nxg3 hxg3 Bxc4 Rf6 Kg7 Bh7 cxd4 Qh5 Qxf6 exf6+ Kxf6 cxd4 Nb3 Rd1;
r2q1rk1/p4p2/bp1pp3/n1p3pn/2PPP3/P1PB2B1/4N1PP/R2Q1RK1 w - - acd 26; pm Nf4; ce 128; 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;
r2q1rk1/p4p2/bp1ppn1p/n1p3P1/2PPP3/P1PB2B1/4N1PP/R2QK2R b KQ - acd 26; pm hxg5; ce 18; pv hxg5 O-O 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 Qxg5 Rxf2 Bxf2 Qd7 Qf4 Qf7;
r2q1rk1/p4p2/bp1ppn1p/n1p3p1/2PPPP2/P1PB2B1/4N1PP/R2QK2R w KQ - acd 26; pm O-O; ce 0; pv O-O Ne8 Qa4 Ng7 fxg5 hxg5 Rf3 Nh5 Rd1 g4 Rf2 Rc8 d5 e5 Rdf1 Rc7 Rf5 Ng7 Rf6 Nh5 R6f5;
r2q1rk1/p4p2/bp1ppn2/n1p3p1/2PPP3/P1PB2B1/4N1PP/R2Q1RK1 b - - acd 28; pm Ne8; ce 10; 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;
r2q1rk1/p4p2/bp1ppn2/n1p3p1/2PPP3/P1PB2B1/4N1PP/R2QK2R w KQ - acd 27; pm Nc1; ce 1; pv Nc1 cxd4 h4 g4 cxd4 Qe7 e5 dxe5 dxe5 Qc5 Qe2;
r2q1rk1/p4p2/bpnppn1p/2p3p1/2PPP3/P1PB2B1/4NPPP/R2QK2R w KQ - acd 27; pm h4; ce 62; pv h4 e5 hxg5 hxg5 Qd2 Ne8 Rh5 f6 O-O-O Ng7 Rh6 Na5 Qa2 Qd7 a4 Kf7 Rdh1 Ke8 d5 Kd8 Rh7 Kc7 Kb1 Rf7 f3 f5;
r2q1rk1/p4p2/bpnppn1p/2p3p1/2PPPP2/P1PB2B1/4N1PP/R2QK2R b KQ - acd 26; pm Nh5; ce 34; pv Nh5 h4 g4 O-O Na5 f5 e5 f6 Kh7 Rf5 Nxg3 Nxg3 Rg8 dxe5 dxe5 Rxe5 Bxc4 Bxc4 Qxd1+ Rxd1 Nxc4 Re7 Kg6 Rdd7 Rgf8 a4 a6 e5 Rfe8 h5+ Kg5 Kf2 Rad8 Rxf7;
r2qk2r/p2p1ppp/bpn1pn2/2p5/2PP4/P1PBP3/4NPPP/R1BQK2R w KQkq - acd 29; pm e4; ce 22; pv e4 O-O e5 Ne8 Qc2 Qh4 O-O;
r2qk2r/p2p1ppp/bpn1pn2/2p5/2PPP3/P1PB4/4NPPP/R1BQK2R b KQkq - acd 28; pm O-O; ce 0; pv O-O e5 Ne8 Qc2 f5 O-O Na5 dxc5 Bxc4 cxb6 axb6 Rb1 Qb8 Bf4 Nc7 Bxc4 Nxc4 Qd3 b5 Qxd7 Qc8 Rfd1 Rxa3 g3 Qxd7 Rxd7 Rf7 Rd8+ Rf8 Rd7;
r4r2/p3qpk1/bp2pR2/n1p1P1p1/2PP2Q1/P1PB2n1/6PP/R5K1 b - - acd 26; pm Rh8; ce -404; pv Rh8 Qxg3 Nc6 Qxg5+ Kf8 Be4 Bxc4 Bxc6 Rc8 d5 exd5 e6 Rxc6 Rxf7+ Qxf7 exf7 Kxf7 Re1 Rf6 h4 d4 cxd4 cxd4 Qe5 Be6 Qxd4 Rc8 Qd6 Rc4 g3 Rc3 Qe5 Rc5 Qb8 Kg7 Qxa7+ Bf7 g4;
r4r2/p3qpk1/bp2pR2/n1p1P1p1/2PP4/P1PB2n1/6PP/R2Q2K1 w - - acd 28; pm hxg3; ce 353; 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;
r4rk1/p3qp2/bp2p3/n1p1P1p1/2PP4/P1PB2n1/6PP/R2Q1RK1 w - - acd 27; pm Rf6; ce 239; 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;
r4rk1/p3qp2/bp2p3/n1p1P1pn/2PP4/P1PB2N1/6PP/R2Q1RK1 b - - acd 28; pm Nxg3; ce -182; 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;
r4rk1/p3qp2/bp2p3/n1p1P1pn/2PP4/P1PB4/4N1PP/R2Q1RK1 w - - acd 28; pm Ng3; ce 185; 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;
r4rk1/p3qp2/bp2pR2/n1p1P1p1/2PP4/P1PB2n1/6PP/R2Q2K1 b - - acd 27; pm Bxc4; ce -179; 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;
r4rk1/p4p2/bp1qp3/n1p1P1pn/2PP4/P1PB4/4N1PP/R2Q1RK1 b - - acd 27; pm Qd8; ce -179; 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;
r4rk1/p4p2/bp1qp3/n1p3pn/2PPP3/P1PB4/4N1PP/R2Q1RK1 w - - acd 28; pm e5; ce 135; pv e5 Qc7 Ng3 Nxg3 Qg4 f5 exf6 Nf5 Qxg5+ Kh8 d5 Bxc4 Bxc4 Rg8 Qh5+ Qh7 Qxh7+ Kxh7 Bd3 Rad8 dxe6 Rxd3 Rxf5 Nc6 e7 Nxe7 fxe7 Re3 Rf7+ Rg7 Rxg7+ Kxg7 Kf2 Rxe7 Rd1 Rf7+ Ke3 Re7+ Kd3 Kg6 g3 Rd7+ Ke2 Rxd1 Kxd1 Kf5 h4;
r5r1/p3qpk1/bp2pR2/n1p1P1p1/2PP2Q1/P1PB2n1/6PP/R5K1 w - - acd 27; pm hxg3; ce 509; pv hxg3 Bxc4 Qh5 Kf8 Raf1 Rg7 Bxc4 Nxc4 Rxf7+ Qxf7 Rxf7+ Rxf7 Qh8+ Ke7 Qxa8 Ne3 Qxa7+ Kf8 Qb8+ Kg7 g4 Rf1+ Kh2 Nxg4+ Kg3 Ne3 dxc5 Rf4 Kh2 bxc5 Qd6 Rf7 Qxe6 c4 Kh3 Rf4 Qe7+ Kg6;
r5r1/p3qpk1/bp2pR2/n1p1P1p1/2PP2Q1/P1PB2P1/6P1/R5K1 b - - acd 25; pm Bxc4; ce -622; pv Bxc4 Qh5 Kf8 Bxc4 Nxc4 Raf1 Rg7 Rxf7+ Qxf7 Rxf7+ Rxf7 Qh8+ Ke7 Qxa8 Ne3 Qb7+ Kf8 Qc8+ Kg7 Qxe6 Rf1+ Kh2 Rf2 Qd7+ Kh6 Kh3 g4+ Kh4 Nxg2+ Kxg4 Ne3+ Kh3 Rf1 Qb7 Rf8 Qxa7 Rh8 g4 Nc4;
r5r1/pn2qpk1/bp2pR2/2p1P1p1/2PP2Q1/P1PB2P1/6P1/5RK1 b - - acd 29; pm Nd8; ce -1090; pv Nd8 d5 Kf8 d6 Qxf6 exf6 Ke8 Be4 Kd7 Bxa8 Bb7 Bxb7 Nxb7 Qd1 Nd8 Qa4+ Nc6 Rd1 Rh8 Qa6 Rb8 Kf2 Kd8 Ke3 Kd7 Ke4 g4 a4 Kd8 d7 Kc7 a5 Rd8 Rb1 Rb8;
r5r1/pn2qpk1/bp2pR2/2p1P1p1/2PP2Q1/P1PB2P1/6P1/R5K1 w - - acd 32; pm Raf1; ce 913; pv Raf1 Nd8 d5 Kf8;
rnbqk2r/p2p1ppp/1p2pn2/2p5/2PP4/P1P1P3/5PPP/R1BQKBNR w KQkq - acd 29; pm Bd3; ce 0; pv Bd3 O-O Ne2 Ba6 e4 Nc6 e5 Ne8 Qc2 f5 O-O Na5 dxc5;
rnbqk2r/p2p1ppp/1p2pn2/2p5/2PP4/P1PBP3/5PPP/R1BQK1NR b KQkq - acd 29; pm Bb7; ce 0; pv Bb7 Nf3 Be4 O-O O-O Be2 Nc6 Nd2 Bg6 Bb2 Na5 Rc1 a6 Re1 d6 f3 Rb8 a4 Nc6 Ra1 Qc7 Ra3 Qd8 Ra1;
rnbqk2r/pp1p1ppp/4pn2/2p5/2PP4/P1P1P3/5PPP/R1BQKBNR b KQkq - acd 26; pm d6; ce 12; pv d6 Bd3 Nc6 Nf3 e5 Ng5 O-O O-O Re8 Qc2 h6 Ne4 Nxe4 Bxe4 cxd4 cxd4 exd4 Rb1 dxe3 fxe3 Qc7 Bb2 Ne5 Bd4 Qxc4 Qxc4;
rnbqk2r/pp1p1ppp/4pn2/2p5/2PP4/P1P5/4PPPP/R1BQKBNR w KQkq - acd 28; pm e3; ce 0; pv e3 O-O Bd3 b6 Nf3 d5 cxd5 exd5 O-O c4 Bc2 Bg4 Bb2 Nc6 Qb1 Bxf3 gxf3 Qc7 e4 Qf4 e5 Ng4 fxg4 Qxg4+ Kh1 Qf3+ Kg1 Qg4+;
rnbqk2r/pppp1ppp/4pn2/8/1bPP4/2N5/PP2PPPP/R1BQKBNR w KQkq - acd 26; pm e3; ce 24; pv e3 O-O Nf3 b6 Bd2 Bxc3 Bxc3 Ne4 Rc1 Bb7 Bd3 Qf6 Be2 Nc6 O-O a5 a3 Ne7 Qa4 Bc6 Qc2 Nxc3 Qxc3 a4 Qd3 Nf5 Ne5;
rnbqk2r/pppp1ppp/4pn2/8/1bPP4/P1N5/1P2PPPP/R1BQKBNR b KQkq - acd 28; pm Bxc3+; ce 4; pv Bxc3+ bxc3 O-O Nf3 d6 Bg5 h6 Bxf6 Qxf6 e3 Qg6 Be2 Qxg2 Rg1 Qh3 Rg3 Qf5 Bd3 Qa5 Qb3 f5 Kd2 Rf7 h4 Nc6 d5 exd5 cxd5;
rnbqk2r/pppp1ppp/4pn2/8/2PP4/P1b5/1P2PPPP/R1BQKBNR w KQkq - acd 29; pm bxc3; ce -4; pv bxc3 Nc6;
rnbqk2r/pppp1ppp/4pn2/8/2PP4/P1P5/4PPPP/R1BQKBNR b KQkq - acd 28; pm O-O; ce 4; pv O-O Nf3 d6 Bg5 c5 e3 Qa5 Qc2 Nbd7 Bd3 cxd4 exd4 b6 O-O Bb7 Rfb1 a6 Bd2 Bxf3 gxf3 Qh5 Qd1 e5 a4 e4 fxe4 Qg6+ Kf1 Nxe4 a5 bxa5 Rb7;
rnbqkb1r/pppp1ppp/4pn2/8/2PP4/2N5/PP2PPPP/R1BQKBNR b KQkq - acd 29; pm Bb4; ce -20; pv Bb4 e3 O-O Nf3 Bxc3+ bxc3 d6 Bd3 e5 dxe5 dxe5 Nxe5 Qd6 Nf3 Rd8 Bc2 Qxd1+ Bxd1 Nc6 Ba3 Be6 Be2 Ne4 Rc1 Na5 Bb4 Nxc4 Nd4 Bd5 f3 Ned6 e4 Be6 Kf2;
rnbqkb1r/pppp1ppp/4pn2/8/2PP4/8/PP2PPPP/RNBQKBNR w KQkq - acd 26; pm Nf3; ce 28; pv Nf3 Bb4+ Bd2 Bxd2+ Qxd2 b6 e3 Bb7 Be2 O-O O-O d6 Nc3 Ne4 Nxe4 Bxe4 Qd1 Nd7 Nd2 Bb7 Bf3 Bxf3 Qxf3 Nf6 Ne4 Nxe4 Qxe4 Qe7 Rac1 c5 Rfd1 f5 Qd3 Rab8;
rnbqkb1r/pppppppp/5n2/8/2PP4/8/PP2PPPP/RNBQKBNR b KQkq - acd 26; pm e6; ce -16; pv e6 Nf3 d5 Nc3 Be7 a3 O-O Bf4 Nc6 e3 Nh5 Be5 g6 Be2 f6 Bg3 Nxg3 hxg3 Na5 cxd5 exd5 Nd2 Be6 b4 Nc6;
rnbqkb1r/pppppppp/5n2/8/3P4/8/PPP1PPPP/RNBQKBNR w KQkq - acd 28; pm c4; ce 32; pv c4 c5 d5 b5 cxb5 a6 bxa6 e6 Nc3 exd5 Nxd5 Nxa6 Bg5 Bb7 Bxf6 gxf6 e3 Nb4 Nc3 Bc6 a3 Qa5 Qd2 Nd5 Bb5;
rnbqkbnr/pppppppp/8/8/3P4/8/PPP1PPPP/RNBQKBNR b KQkq - acd 29; pm Nf6; ce -12; pv Nf6 c4 e6 Nc3 Bb4 Qc2 O-O Nf3 c5 e3 b6 Bd2 cxd4 exd4 Bb7 Be2 Bxc3 Bxc3 Be4 Qd2 Nc6 O-O d5 c5 Qc7 h3 Bg6 Qe3 bxc5 dxc5;
rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - acd 43; pm d4; ce 24; pv d4 Nf6 c4 e6 Nf3 d5 Nc3 c5 cxd5 cxd4 Qxd4 exd5 e4 dxe4 Qxd8+ Kxd8 Ng5 Be6 Nxe6+ fxe6 Bg5 Ke8 Bb5+ Kf7 O-O-O a6 Ba4 Nc6 Bxf6 gxf6 Nxe4 f5;