Georg Gross vs Christian Hacker (1996)

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Georg Gross vs Christian Hacker
BL2-W 9596 (1996), Germany
Queen's Indian Defense: Classical Variation. Polugayevsky Gambit (E17) · 1-0

ANALYSIS [x]

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Jul-09-15		al wazir: I didn't get it. I considered the game line but missed 23. Qf6. But I think this is tougher than it looks. To play this OTB you would have to think about what happens after 22...Nxe8. Now white can play 23. Nxd5, with the deadly threat of 24. Nf6+, and I don't see any answer.

Jul-09-15		tigerngm: Didn't see this far but possible continuation: The d5 bishop threatens black's rook. But if 24... Nxd5 25. Nxd5 to be followed by 26. Qh8# if 24... Rd8?. 25. Qh8+ Ke7. 26. Bf6+ Kd7. 27. Bxf7+ with revealed check and winning the black queen.

Jul-09-15		EXIDE: I tried hard but cannot see the win after 20. Re6:pxR 21Be5+,Bf6 or such similar lines.

Jul-09-15		devere: After 20.Rxe6! fxe6 21.Nf7! Black's real deficit is positional not material. He has no way to control the dark squares in the center and around his King. The game might have continued 21...Qd7 22. Be5+ Kg8 23. Nxg5 Rf8 24. Qe3 Rae8 click for larger view White has an iron grip on the position, but still has to play well to win.

Jul-09-15		erimiro1: Not that easy! 3 options are lead by pure intuition: 20.R:e6 20. N:f7 and 20. N:d5; 20.R:e6 looks the right choice (eliminating the bishop that protects both f7 and d5). To calculate the rest you need more time (22.-N:e8 23. Nd5 wins).

Jul-09-15		diagonalley: jeeez... this one was hard <diagonalley>: nul points :-(

Jul-09-15		whiteshark: <diagonalley> Thursday is my crytonite, too. 8-(

Jul-09-15		wooden nickel: This was a tough one for me. I discarded the winning move 20.Rxe6 due to 20... fxe6, not getting 21.Nf7! I considered 20.Nxf7, but it didn't quite convince me. click for larger view After 20. Nxf7 Bxf7 21.Rxe8 Nxe8 22.Nxd5 Rc8

Jul-09-15		morfishine: I "figured" <20.Rxe6> and echo the comments *****

Jul-09-15		saturn2: It did not get it. I considered the sacrifices Nxf7 and Rxe6, but did not find any forcing continuation. Also if black chooses instead of taking the Knight on h6 20..Rxe6, or 20..Nxe6 the continuation is far from obvious to me.

Jul-09-15		OhioChessFan: After playing through the game continuation, I still don't get it.

Jul-09-15		dfcx: White is down a pawn. And white's focus is on f7 pawn. The first move is to remove the defender! 20.Rxe6! Black has many choices. A. 20...fxe6 21.Nf7 Qe7 22.Nxg5 B. 20...Rxe6 21.Nxf7 Kxf7 (Qe7 similar to A) 22.Bxg5+ Rf6 23.Qg4 looks good C. 20...Nxe6 21.Nxf7 Qd7 22.Nxf7 D. 20...Bxh6 21.Be5+ Kf8 22.Rxe8+ Nxe8 23.Nxd5 and white looks good. Time to check.

Jul-09-15		patzer2: I missed this Thursday puzzle (20. ?). I considered the winning move 20. Rxe6!!, but in my calculations after 20...fxe6 or 20...Rxe6 (diagram below) click for larger view I missed the surprise winning shot 21. Nxf7! (diagram below): click for larger view Here (diagram above) Black is busted after 21...Kxf7 (21... Qf6 22. Nxg5 ) 22. Bxg5+ Rf6 23. Qg4 h5 (23... h6 24. Bxf6 Qxf6 25. Nxd5 ) 24. Qd4 Ne6 25. Bxd5 Nac7 26. Qxf6+ Qxf6 27. Bxf6 Nxd5 28. Nxd5 (+5.94 @ 21 depth, Deep Fritz 14). If 20...Bxf5 (diagram below), click for larger view 21. Rxe8! wins decisive material after 21...Qxe8 22. Qxf4 (+6.26 @ 24 depth, Deep Fritz 14). P.S.: Black starts to lose control of the game after <15...Bc8?> allowing <16. Nh6+! >. Instead, Black should play 15... Bf8! when play might continue 16. exd5 Bc8 17. d6 Bxf5 18. dxc7 Nxc7 19. Qf3 Ne6 20. Be3 Nd4 21. Qf4 Nc2 22. Bxc6 Nxa1 23. Rxa1 Re6 24. Bxa8 Qxa8 25. Rd1 h5 (-0.47 @ 24 depth, Deep Fritz 14).

Jul-09-15		CHESSTTCAMPS: White is down a pawn, but has better coordination of forces - centralized rooks, a well-placed queen, and an advanced Nh6 that black now threatens to take. The fact that f7 is lightly defended suggests the possibility of removing the defender so that the knight can do serious damage. 20.Rxe6!! and white must win material: A) 20... fxe6 21.Nf7! Qd7 22.Be5+! Kg8 23.Nxg5 and white has won 2Bs for a rook with control of the center and dark squares. A.1) 21... Kxf7? 22.Bxg5+ wins the queen. A.2) 21... Qe7 22.Nxg5 with similar outcome to main line A.3) 21... Qf6 23.Be5 Kxf7 24.Bxf6 Bxf6 (Q for N+R) B) 20...Nxe6 21.Nxf7 also wins 2 minor pieces+pawn for a rook, but black must lose d-pawn as well. C) 20... Rxe6 21.Nxf7 Kxf7 (other 22.Nxg5 is winning) 22.Bxg5+ Rf6 23.Bxf6 Qxf6 24.Qxf6+ Kxf6 25.Rxd5 with a pawn-up active R+B versus R+N ending that looks won. D) 20... Kxh6 21.Rxe8 Nxe8 (Qxe8 22.Bxg5+ Kxg5 23.Qf4+ Kh5 24.Qh4#) 22.Bxg5+ Qxg5 23.Qxf7 is winning. E) 20... Bxh6 21.Rxe8 Qxe8 (Nxe8 22.Bxh6+ Kxh6 23.Qxf7) 22.Bxh6+ Kxh6 23.Nxd5 Nxd5 24.Qxd5 with a pawn up and a dominating position. White can also keep queens on the board in C, and win d-pawn with a strong position. Time for review....

Jul-09-15		CHESSTTCAMPS: I did not consider 21.Be5+ in E (the game continuation).

Jul-09-15		saturn2: @CHESSTTCAMPS D) 20... Kxh6 21.Rxe8 Nxe8 22.Bxg5+ Qxg5 23.Qxf7 is winning. Actually I dismissed 20 Rxe6 because of this variation. Even if the black pawn d5 will fall soon I do not see a clear advantage for white. All in all white is a pawn up then.

Jul-09-15		Chizoad: Tough position for me to understand, although I did get the first move and saw the continuations after 20...Rxe6 and 20...Nxe6. I thought the pseudo back-to-back sacrifices in the 20.Rxe6 Rxe6 21. Nxf7! line were really beautiful and stopped searching after I found that.

Jul-09-15		kevin86: I had the first move, but no further.

Jul-09-15		Jimfromprovidence: I got 20 Rxe6 fxe6 21 Nf7 Qe7 (prevents 22 Be5+) 22 Nxg5 Kg8. click for larger view It look like all of the action for white will focus on pressuring the center, in particular the e6 pawn. How to achieve this and get a win I do not know.

Jul-09-15		agb2002: White is one pawn down. Black threatens 20... Bxh6. The first idea that comes to mind is 20.Nxf7 and if 20... Kxf7 then 21.Bxg5+ wins. However, Black can play 20... Bxf7. This suggests 20.Rxe6: A) 20... Nxe6 21.Nxf7 A.1) 21... Kxf7 22.Bxg5+ wins. A.2) 21... Qf6 22.Be5 wins decisive material. For example, 22... Kxf7 23.Bxf6 Bxf6 24.Nxd5 followed by Qxf6. A.3) 21... Qe7 22.Be5+ (22.Nxd5 Qxf7) 22... Kg8 (22... Kf8 23.Nxg5+ wins material) 23.Nh6+ Bxh6 24.Nxd5 with the double threat 25.Nxe7+ and 25.Nf6+ followed by Nh6+ looks very good for White. B) 20... fxe6 21.Nf7 followed by 22.Nxg5 with more or less the same material but much better position. C) 20... Bxh6 21.Be5+ C.1) 21... Kg8 22.Rxe8+ C.1.a) 22... Nxe8 23.Nxd5 with x-ray threats against the black queen and rook looks winning. C.1.b) 22... Qxe8 23.Qf6 Kf8 24.Nxd5 Nxd5 25.Bxd5 looks bad for black. C.2) 21... Kf8 22.Rxe8+ looks similar to C.1. D) 20... Kxh6 21.Rxe8 Nxe8 (21... Qxe8 22.Bxg5+ Kxg5 23.Qf4+ Kh5 24.Qh4#) 22.Rxd5 forks the queen and the bishop.

Jul-09-15		thegoodanarchist: <al wazir: I didn't get it. I considered the game line but missed 23. Qf6. But I think this is tougher than it looks.> Yeah, same here. I got the 20. Rxe6 sac but after that I didn't know how to proceed.

Jul-09-15		Nichth: Tough. I saw that 20.Nxf7 Bxf7 allows 21.Rxe8. If then either 21...Qxe8 or Bxe8 the D5 pawn becomes more vulnerable. I couldnt see further than that, but the engines show advantage white in both these variations. Not sure I would have committed to the first move OTB though.

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