Which is the deepest Queen Sac ever made by Human that engine would not considered

[Chessqueen]

I remembered Bobby Fischer Queen Sac but Carlsen also just made an interesting one and there must be other deeper that most engines would not even considered
and this sac by MVL

[MikeB]

[d]4rrk1/1b3ppp/2qb4/1p1P4/2p1NP2/2P3PQ/BP5P/R3R1K1 b - - 0 28
Qxd5 is best, but most people would have played Qb6+ -may be hard for engines

[AdminX]

This one by Nakamura is one the best I ever seen.


Click image for larger view

[d]4r1k1/3nbppp/bqr2B2/p7/2p5/6P1/P2N1PBP/1R1QR1K1 b - - 0 21

[pgn]
[Event "Barcelona Casino"]
[Site "Barcelona"]
[Date "2007.10.19"]
[Round "2"]
[White "Krasenkow, Michal"]
[Black "Nakamura, Hikaru"]
[Result "0-1"]
[ECO "A14"]
[WhiteElo "2668"]
[BlackElo "2648"]
[Annotator "Ftacnik,L"]
[PlyCount "56"]
[EventDate "2007.10.18"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "ESP"]
[EventCategory "15"]
[SourceTitle "CBM 121"]
[Source "ChessBase"]
[SourceDate "2007.11.14"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.14"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. O-O O-O 6. b3 a5 7. Nc3 c6 8. d4
Nbd7 9. Qc2 b6 10. e4 Ba6 11. Nd2 c5 {Nakamura plays very active chess. It is
only natural that he stirs up trouble before White has managed to develop his
dark-squared bishop.} 12. exd5 (12. dxc5 d4 13. Nb5 Bxc5 14. e5 Nxe5 15. Bxa8
Qxa8 $15) 12... cxd4 13. Nb5 exd5 (13... Bxb5 14. dxe6 $1 (14. cxb5 $2 Nxd5 $17
) 14... Bxc4 15. Qxc4 Rc8 16. exf7+ Rxf7 17. Qxd4 $14) 14. Nxd4 Rc8 15. Re1 b5
16. Bb2 {This seems to be the first independent move in a situation, when both
sides are firing at the centre with most of their forces. Black is balancing
the active location of the white knight on d4 with the unpleasant pressure
against the c4 pawn.} (16. Qf5 bxc4 17. bxc4 Bxc4 18. Nxc4 Rxc4 19. Bb2 Bb4 20.
Red1 Re8 21. Bxd5 Nxd5 22. Qxd5 Nb6 23. Qh5 Qf6 $11 {1-0 Truskavetsky,A (2284)
-Grabinsky,V (2258)/Alushta 2002 (34)}) 16... Re8 (16... bxc4 17. bxc4 Nb6 18.
Nf5 Bc5 19. Bh3 $13) 17. Qd1 $2 {Krasenkow is becoming nervous and retreats
his queen to its initial location. Objectively speaking, it can not be the
best move, even though the refutation is spectacular.} (17. Nf5 Bc5 18. h3 Re6
$15) 17... bxc4 18. bxc4 Qb6 $1 (18... Bxc4 19. Nxc4 Rxc4 20. Nf5 Bc5 $15) (
18... dxc4 $2 19. Nc6 Qb6 20. Nxe7+ Rxe7 21. Rxe7 Qxb2 22. Ne4 $16) 19. Rb1
dxc4 $1 {It becomes clear, that White needs a good trick to reverse the
unfavourable development of the game.} (19... Bc5 20. Ba3 Rxe1+ 21. Qxe1 $13)
20. Nc6 $2 (20. Bc3 Qc5 21. Qc2 $17) 20... Rxc6 21. Bxf6 (21. Bxc6 Qxc6 $19)
21... Qxf2+ $3 {A beautiful combination in the style of the old masters. The
fact that queen is unprotected and seemingly unsupported makes the shot truly
spectacular.} 22. Kxf2 (22. Kh1 Qxf6 $19) 22... Bc5+ 23. Kf3 (23. Kf1 c3+ $1 (
23... Rxf6+ $4 24. Bf3 c3+ 25. Kg2 $18) 24. Re2 c2 $19) (23. Bd4 Bxd4+ 24. Kf3
Rf6+ 25. Kg4 Ne5+ 26. Kg5 Bc8 $19) 23... Rxf6+ 24. Kg4 Ne5+ $1 {The finale of
the game is cat and mouse play. The naked white king has no chance to survive
among the pack of wild black pieces.} 25. Kg5 (25. Rxe5 Bc8+ $1 26. Rf5 Bxf5+
27. Kh4 Rh6+ 28. Kg5 Bc8 $19) 25... Rg6+ 26. Kh5 f6 (26... Bc8 27. Ne4 Be7 $19)
27. Rxe5 Rxe5+ 28. Kh4 Bc8 $1 (28... Bc8 $1 29. g4 Bf2+ 30. Kh3 Rh6# (30...
Rh5#)) 0-1
[/pgn]

[yurikvelo]

Qxd5 is best, but most people would have played Qb6+ -may be hard for engines

Qxd5 is good sac trap vs human opponent.
Against engines it doesn't work, and is on par with Qb6+

Qxd5 was slightly better from D=42 to D=51
From D=52 and up to D=41 Qb6+ is a bit better

Code: Select all

D=53
-2,95	28. ... Qb6+ 29.Kf1 Bxd5 30.Nf6+ gxf6 31.Qg4+ Kh8
-2,87	28. ... Qxd5 29.Rad1 Rxe4 30.Rxd5 Rxe1+ 31.Kf2 Rfe8

-2,72	29.Rad1 Rxe4 30.Rxd5 Rxe1+ 31.Kf2 Rfe8
-8,87	29.Nxd6 Qc5+ 30.Kf1 Qxd6 31.g4 Qxf4+
-8,89	29.Qg2 Rxe4 30.Rxe4 Bc5+ 31.Kf1 Qd3+
-9,66	29.Bb1 Bc5+ 30.Kf1 f5 31.Bc2 fxe4
-16,68	29.Bxc4 Bc5+ 30.Nxc5 Qxc5+ 31.Kf1 Qxc4+

[jp]

4rrk1/1b3ppp/2qb4/1p1P4/2p1NP2/2P3PQ/BP5P/R3R1K1 b - - 0 28
Qxd5 is best, but most people would have played Qb6+ -may be hard for engines

But we don't know Qxd5 actually is best. Can people with good hardware please let your engines upon this position?

Edit: I wrote this before seeing yurikvelo's post. yurikvelo, is that SF's analysis?

[MikeB]

4rrk1/1b3ppp/2qb4/1p1P4/2p1NP2/2P3PQ/BP5P/R3R1K1 b - - 0 28
Qxd5 is best, but most people would have played Qb6+ -may be hard for engines

But we don't know Qxd5 actually is best. Can people with good hardware please let your engines upon this position?

Edit: I wrote this before seeing yurikvelo's post. yurikvelo, is that SF's analysis?

Indeed, I had left the analysis running and my also switched to Ob6+ by a slightly better margin over Qxd5...

[MikeB]

This one by Nakamura is one the best I ever seen.


Click image for larger view

[d]4r1k1/3nbppp/bqr2B2/p7/2p5/6P1/P2N1PBP/1R1QR1K1 b - - 0 21

[pgn]
[Event "Barcelona Casino"]
[Site "Barcelona"]
[Date "2007.10.19"]
[Round "2"]
[White "Krasenkow, Michal"]
[Black "Nakamura, Hikaru"]
[Result "0-1"]
[ECO "A14"]
[WhiteElo "2668"]
[BlackElo "2648"]
[Annotator "Ftacnik,L"]
[PlyCount "56"]
[EventDate "2007.10.18"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "ESP"]
[EventCategory "15"]
[SourceTitle "CBM 121"]
[Source "ChessBase"]
[SourceDate "2007.11.14"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.14"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. O-O O-O 6. b3 a5 7. Nc3 c6 8. d4
Nbd7 9. Qc2 b6 10. e4 Ba6 11. Nd2 c5 {Nakamura plays very active chess. It is
only natural that he stirs up trouble before White has managed to develop his
dark-squared bishop.} 12. exd5 (12. dxc5 d4 13. Nb5 Bxc5 14. e5 Nxe5 15. Bxa8
Qxa8 $15) 12... cxd4 13. Nb5 exd5 (13... Bxb5 14. dxe6 $1 (14. cxb5 $2 Nxd5 $17
) 14... Bxc4 15. Qxc4 Rc8 16. exf7+ Rxf7 17. Qxd4 $14) 14. Nxd4 Rc8 15. Re1 b5
16. Bb2 {This seems to be the first independent move in a situation, when both
sides are firing at the centre with most of their forces. Black is balancing
the active location of the white knight on d4 with the unpleasant pressure
against the c4 pawn.} (16. Qf5 bxc4 17. bxc4 Bxc4 18. Nxc4 Rxc4 19. Bb2 Bb4 20.
Red1 Re8 21. Bxd5 Nxd5 22. Qxd5 Nb6 23. Qh5 Qf6 $11 {1-0 Truskavetsky,A (2284)
-Grabinsky,V (2258)/Alushta 2002 (34)}) 16... Re8 (16... bxc4 17. bxc4 Nb6 18.
Nf5 Bc5 19. Bh3 $13) 17. Qd1 $2 {Krasenkow is becoming nervous and retreats
his queen to its initial location. Objectively speaking, it can not be the
best move, even though the refutation is spectacular.} (17. Nf5 Bc5 18. h3 Re6
$15) 17... bxc4 18. bxc4 Qb6 $1 (18... Bxc4 19. Nxc4 Rxc4 20. Nf5 Bc5 $15) (
18... dxc4 $2 19. Nc6 Qb6 20. Nxe7+ Rxe7 21. Rxe7 Qxb2 22. Ne4 $16) 19. Rb1
dxc4 $1 {It becomes clear, that White needs a good trick to reverse the
unfavourable development of the game.} (19... Bc5 20. Ba3 Rxe1+ 21. Qxe1 $13)
20. Nc6 $2 (20. Bc3 Qc5 21. Qc2 $17) 20... Rxc6 21. Bxf6 (21. Bxc6 Qxc6 $19)
21... Qxf2+ $3 {A beautiful combination in the style of the old masters. The
fact that queen is unprotected and seemingly unsupported makes the shot truly
spectacular.} 22. Kxf2 (22. Kh1 Qxf6 $19) 22... Bc5+ 23. Kf3 (23. Kf1 c3+ $1 (
23... Rxf6+ $4 24. Bf3 c3+ 25. Kg2 $18) 24. Re2 c2 $19) (23. Bd4 Bxd4+ 24. Kf3
Rf6+ 25. Kg4 Ne5+ 26. Kg5 Bc8 $19) 23... Rxf6+ 24. Kg4 Ne5+ $1 {The finale of
the game is cat and mouse play. The naked white king has no chance to survive
among the pack of wild black pieces.} 25. Kg5 (25. Rxe5 Bc8+ $1 26. Rf5 Bxf5+
27. Kh4 Rh6+ 28. Kg5 Bc8 $19) 25... Rg6+ 26. Kh5 f6 (26... Bc8 27. Ne4 Be7 $19)
27. Rxe5 Rxe5+ 28. Kh4 Bc8 $1 (28... Bc8 $1 29. g4 Bf2+ 30. Kh3 Rh6# (30...
Rh5#)) 0-1
[/pgn]

wow +1 , easy for computers, but very pretty nonetheless...