Volokitin-Rublevsky, Budapest 2004

[jdart]

[D] r4rk1/1bq1bppp/ppn1p3/2n1P3/P2N1BQ1/2NB4/1PP3PP/R4R1K w - -

bm Nd5

This is an amazing sac by Volokitin. The game was annotated by GM Kavalek, here:
http://www.washingtonpost.com/wp-dyn/ar ... Sep26.html

Toga could not find Nd5 in an 18-ply search. The problem seems to be that after .. exd5 17. e6 Qd8 (not Qc8 as in the game), it thinks White can only draw with 18. Bh6, but this is not so.

Analysis after 17..Qd8

[D] r2q1rk1/1b2bppp/ppn1P3/2np4/P2N1BQ1/3B4/1PP3PP/R4R1K w - -

no 8 1510 -128 876488 Nf5 Nxe6 Nh6+ Kh8 Qf5 g6 Nxf7+ Rxf7 Qxf7
Nxf4 Rxf4 Ne5 Qe6
yes 8 2370 -27 1338442 Bh6 Bf6 Bxg7 Bxg7 Bxh7+ Kh8 Qh5 Bh6 Nxc6
Bxc6 Qxh6 fxe6 Bg6+ Kg8
yes 9 3140 +0 1732329 Bh6 Bf6 Bxg7 Bxg7 Bxh7+ Kxh7 Qf5+ Kg8
exf7+ Rxf7 Qxf7+ Kh8 Qh5+ Kg8 Qf7+
yes 10 7190 +0 3987146 Bh6 Bf6 Bxg7 Bxg7 Bxh7+ Kxh7 Qf5+ Kg8
exf7+ Rxf7 Qxf7+ Kh8 Qh5+ Kg8 Qf7+
yes 11 16280 +0 8972319 Bh6 Bf6 Bxg7 Bxg7 Bxh7+ Kxh7 Qf5+ Kg8
exf7+ Rxf7 Qxf7+ Kh8 Qh5+ Kg8 Qf7+
yes 12 39680 +0 22619079 Bh6 Bf6 Bxg7 Bxg7 Bxh7+ Kxh7 Qf5+ Kg8
exf7+ Rxf7 Qxf7+ Kh8 Qh5+ Kg8 Qf7+
yes 13 109030 +0 62102671 Bh6 Bf6 Bxg7 Bxg7 Bxh7+ Kxh7 Qf5+ Kg8
exf7+ Rxf7 Qxf7+ Kh8 Qh5+ Kg8 Qf7+
yes 14 401610 +160 223012495 Bh6 Bf6 Bxg7 Bxg7 Bxh7+ Kxh7 Qf5+ Kg8
exf7+ Rxf7 Qxf7+ Kh8 Ra3 Qd7 Rh3+ Qxh3
gxh3 Nxd4 Rf4 Nf3 Rxf3 Bxb2 Qh5+ Kg8 Qg6+
Kh8 Qxb6
yes 15 1371590 +225 762058241 Bh6 Bg5 exf7+ Rxf7 Rxf7 Bxh6 Ne6 Kxf7
Nxd8+ Rxd8 Bxh7 Rd6 Rf1+ Ke7 a5 bxa5 Qh4+
Ke8 Qh5+ Kd8 Rf7 Ne7

So, 400 seconds to see a White advantage here and that is 3 ply after the sac.

[jdart]

correction: the game location was Budva (Montenegro), not Budapest. This is the game:

[Event "SCG-chT"]
[Site "Budva"]
[Date "2004.09.13"]
[Round "6.1"]
[White "Volokitin, Andrei"]
[Black "Rublevsky, Sergei"]
[Result "1-0"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Be2 Nf6 6. Nc3 d6 7. O-O Be7 8. f4
O-O 9. a4 Qc7 10. Kh1 b6 11. e5 dxe5 12. fxe5 Nfd7 13. Bf4 Bb7 14. Bd3 Nc5 15.
Qg4 Nc6 16. Nd5 exd5 17. e6 Qc8 18. Bh6 g6 19. Bxf8 Bxf8 20. exf7+ Kh8 21. Bf5
Qc7 22. Bxg6 Ne5 23. Qg3 Bg7 24. Bxh7 Kxh7 25. Qh3+ Bh6 26. Rf6 Nxf7 27. Raf1
Rf8 28. Qh5 Kg8 29. Qg6+ Bg7 30. Nf5 Ne6 31. Rxe6 1-0

[Dan]

[D] r4rk1/1bq1bppp/ppn1p3/2n1P3/P2N1BQ1/2NB4/1PP3PP/R4R1K w - -

bm Nd5

CMX_Aggressive finds it in under 3 minutes on a Celeron 1.7gHz machine

Time Depth Score Positions Moves
---- ---- ---- ---- ----
0:00 1/3 3.92 1236 1.Bxh7+ Kh8 2.Bh6 gxh6 3.Nxc6 Qxc6
0:00 1/3 4.42 3856 1.Bh6 g6 2.Bxf8 Rxf8 3.Nxc6 Qxc6
0:00 1/4 4.42 6251 1.Bh6 g6 2.Bxf8 Rxf8 3.Nxc6 Qxc6
0:00 1/4 4.69 8357 1.Bxh7+ Kh8 2.Nxc6 Qxc6 3.Be4 Nxe4
4.Nxe4 Qxe4
0:00 1/5 4.69 24744 1.Bxh7+ Kh8 2.Be4 Nxe4 3.Nxc6 Qxc6
4.Nxe4 Qxe4
0:01 1/6 5.06 179109 1.Bxh7+ Kxh7 2.Nd5 exd5 3.e6 Qd8
4.Nxc6 Bxc6 5.exf7 Rxf7
0:03 1/7 5.17 376664 1.Bxh7+ Kxh7 2.Nd5 exd5 3.e6 Qc8
4.Nxc6 Qxc6
0:11 1/8 5.00 1230828 1.Bxh7+ Kxh7 2.Nd5 exd5 3.Nf5 g6
4.Qh3+ Kg8 5.Qh6 Ne6 6.Rad1 Bc5
7.Rxd5
0:41 1/9 5.00 4492971 1.Bxh7+ Kxh7 2.Nd5 exd5 3.Nf5 g6
4.Qh3+ Kg8 5.Qh6 Ne6 6.Rad1 Bc5
7.Rxd5
0:59 1/9 5.20 6278793 1.Bh6 Qxe5 2.Nxc6 Bxc6 3.Rae1 f5
4.Bxf5 Rxf5 5.Qxf5 Qxf5 6.Rxf5
gxh6 7.Rxc5 bxc5 8.Rxe6
1:38 1/10 5.20 10853551 1.Bh6 Qxe5 2.Nxc6 Bxc6 3.Rae1 f5
4.Bxf5 Rxf5 5.Qxf5 Qxf5 6.Rxf5
gxh6 7.Rxc5 bxc5 8.Rxe6
2:49 1/10 5.86 18839388 1.Nd5 exd5 2.e6 Qc8 3.Bh6 g6 4.Nxc6
Bxc6 5.Bxf8 Qxf8 6.exf7+ Kg7
4:32 1/11 6.35 29872669 1.Nd5 exd5 2.e6 Qd8 3.Bxh7+ Kxh7
4.Nxc6 Bxc6 5.Bc7 Qe8 6.Be5 Nxe6
7.Bxg7 f5

[Chris Taylor]

[quote="jdart"]correction: the game location was Budva (Montenegro), not Budapest. This is the game:

[Event "SCG-chT"]
[Site "Budva"]
[Date "2004.09.13"]
[Round "6.1"]
[White "Volokitin, Andrei"]
[Black "Rublevsky, Sergei"]
[Result "1-0"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Be2 Nf6 6. Nc3 d6 7. O-O Be7 8. f4
O-O 9. a4 Qc7 10. Kh1 b6 11. e5 dxe5 12. fxe5 Nfd7 13. Bf4 Bb7 14. Bd3 Nc5 15.
Qg4 Nc6 16. Nd5 exd5 17. e6 Qc8 18. Bh6 g6 19. Bxf8 Bxf8 20. exf7+ Kh8 21. Bf5
Qc7 22. Bxg6 Ne5 23. Qg3 Bg7 24. Bxh7 Kxh7 25. Qh3+ Bh6 26. Rf6 Nxf7 27. Raf1
Rf8 28. Qh5 Kg8 29. Qg6+ Bg7 30. Nf5 Ne6 31. Rxe6 1-0[/quote]

Jon

AMD 4600 Dual

[d]r4rk1/1bq1bppp/ppn1p3/2n1P3/P2N1BQ1/2NB4/1PP3PP/R4R1K w - - 0 1

Analysis by ProDeo 1.6:Q3

1.Nd5 Qd8 2.Bh6 g6 3.Nxc6 Bxc6 4.Bxf8 Qxf8
= (0.18) Depth: 8 00:00:02 2696kN
+- (2.99) Depth: 15 00:14:41 1471mN


(Taylor, Notts 18.10.2007)

Chris