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| Apr-24-09 | | laskereshevsky: In the same tournament, same rounds before, Korchnoi won a nice game with the same opening versus Sokolov A., playing 17...♘e4 in place of 17...♘a4. A Sokolov vs Korchnoi, 1987
Korchnoi himself commented:<"Dont being full satisfacted by the opening in this game, (without any efective reason!) same days after with Hubner I played 17...♘a4? and after 18.♗xh7+ ♔xh7 19.e6!! I resigned cause only a huge loss of material saved from the mate!..."> So, according to Korchnoi, the mate is avoidable but only by reaching a lost position... its a pitty Viktor didnt give variants in this comment |
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| Apr-24-09 | | Marmot PFL: Easier than yesterday i thought, as there were fewer details to work out. Bxh7+ and Ng5+ is something black must ALWAYS watch for, and that combined with e6 blocking the queen from g4 is fatal. Of course Na4 was ridiculous when there are so many k side threats but Korchnoi was always experimenting with this opening. |
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| Apr-24-09 | | hedgeh0g: I knew I must be missing something when I figured Bxh7+, followed by Ng5+ would be winning for White. I missed e6!, which prevents the Black Queen from blocking checks along the b1-h7 diagonal once the king comes to g6. Without this move, I think Black can squirm his way out of trouble. |
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| Apr-24-09 | | Marmot PFL: This game was played in 1987, and the 2 players were rated 2610 and 2630. Today I believe their ratings would be about 120 points higher, suggesting rating inflation of about 5 points/year. (What was Kasparov's rating at this time?) |
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| Apr-24-09 | | TheChessGuy: <Marmot PFL> He was at 2740 going into the World Championship match against Karpov in Sevilla. |
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| Apr-24-09 | | stacase: 19 Bxh7 is what I would have played over the board. I was surprised to see Black accept the Bishop as I don't see where it goes if Black played 19 ... Kh8 |
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| Apr-24-09 | | Patriot: I went with 18.Bxh7+ Kxh7 19.Ng5+ Kg6 20.e6 fxe6 21.g4 Bxg4 22.Qxg4 e5 23.Ne6+ Kf6 and 24.Bg5+ is at least winning. |
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| Apr-24-09 | | tivrfoa: well ... I didn't play it, because black could play 18. ... Kh8. |
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| Apr-24-09 | | Patriot: <stacase: 19 Bxh7 is what I would have played over the board. I was surprised to see Black accept the Bishop as I don't see where it goes if Black played 19 ... Kh8> It is interesting what might happen. 19.Bxh7+ Kh8 20.Bc2 Nxc3 21.Qd3 Ne4 22.Rxe4 dxe4 23.Qxe4 Bg6 24.Qh4+ Kg8 looks very dangerous for white, due to the threat of 25...Qd1+ 26.Bxd1 Rxd1+ 27.Ne1 Rxe1# and 25...Bxc2. So 22.Rxe4 looks like a mistake, but I'm not sure where the key move is (if there is one). |
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| Apr-24-09 | | agb2002: White has the bishop pair and Black threatens 18... Nxc6 19.Qd3 Ne4 20.Ng5 Bg6. An obvious idea is to try 18.Bxh7+ Kxh7 19.Ng5+ but Black can play 19... Kg6 20.Qd3+ Qf5. This suggests 18.e6, however Black has the intermediate 18... Bxf3 and after 19.Qxf3 fxe6 20.Qh3 Nf5 21.g4 Nh6 22.Bxh6 gxh6 23.Qxh6 Nxc3 24.Qxe6+ Qxe6 25.Rxe6 I don't see any decisive advantage, although probably White can improve upon this line. Another possibility is to combine both ideas: 18.Bxh7+ A) 18... Kxh7 19.e6
A.1) 19... fxe6 20.Ng5+
A.1.a) 20... Kg6 21.g4 Bxg4 (21... Rh8 22.Rxe6+ Qxe6 23.gxh5+ Rxh5 24.Nxe6 + -) 22.Qxg4 with the threats 23.Rxe6+ and 23.Nxe6+. A.1.b) 20... Kh6 21.Nf7+ Kh7 (21... Kg6 22.Ne5+ Kh7 (22... Kf5 23.Qxh5+ Kf6 24.Qg5#) 23.Qxh5+ Kg8 24.Nxd7) 22.Qxh5+ Kg8 23.Nxd8 + -. Probably 23.Ng5 is better, like A.1.c. A.1.c) 20... Kg8 21.Qxh5 Rf5 22.Qh7+ Kf8 23.Nxe6+ + -. A.1.d) 20... Kh8 21.Qxh5+ Kg8 22.Qh7#.
A.2) 19... Bxf3 20.Qd3+ Be4 21.Qh3+ followed by 22.exd7 + -. A.3) 19... Qd6 20.Ng5+
A.3.a) 20... Kg6 21.g4 is similar to A.1.a.
A.3.b) 20... Kh6 21.Nxf7+ Kg6 (21... Kh7 22.Qxh5+ Kg8 23.Qh8#) 22.Nxd6 + -. A.3.c) 20... Kg8 21.Qxh5 Rfe8 22.exf7+ Kf8 23.Nh7#.
A.3.d) 20... Kh8 21.Qxh5+ Kg8 22.Qh7#.
A.4) 19... <other queen move> 20.Ng5+ is similar to A.3. A.5) 19... Nxc3 20.Ng5+
A.5.a) 20... Kg6 21.Qd3+ and 22.exd7 + -.
A.5.b) 20... Kh6 21.Nxf7+ Kg6 (21... Kh7 22.Qxh5+ Kg8 23.Qh8#) 22.Qd3+ and 23.exd7 + -. A.5.c) 20... Kg8 21.Qxh5 + -.
B) 18... Kh8 19.Bc2 Nxc3 20.Qd3 Ne4 21.Ng5
B.1) 21... Bg6 22.e6 fxe6 23.Qh3+ Kg8 24.Nxe6 Bf5 25.Nxf8 + -. B.2) 21... Nxg5 22.Bxg5 Bg6 and I don't see an immediate win here. Not very satisfied with this, particularly line B, but I can't spent more time in this puzzle now. |
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| Apr-24-09 | | xrt999: < Patriot: I went with 18.Bxh7+ Kxh7 19.Ng5+ Kg6 20.e6 fxe6 21.g4 Bxg4 22.Qxg4 e5 23.Ne6+ Kf6 and 24.Bg5+ is at least winning.> why wouldnt black play 20...Bxd1 taking the queen? White takes back with 21.exd7 and then what? |
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| Apr-24-09 | | xrt999: < zooter: Hmmm... I did see in some lines that 18.e6 or 18.Bxh7+ Kxh7 19.e6 is good, but why not an immediate 19.Ng5+? > It appears that our 20.Qd3+ is met with 20...Qf5; e6 is prophylactic while maintaining the tensions, and prevents the interposition of the queen. White is then free to play his beloved Ng5+. 19.e6! is one of those in-between moves which we are all aspiring to find, in chess and in life. see posts by <dzechiel> and <hedgeh0g> |
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| Apr-24-09 | | kevin86: An unusual and effective final move-I "fell" for Ng5+,which solves nothing. |
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| Apr-24-09 | | Patriot: xrt999: < Patriot: I went with 18.Bxh7+ Kxh7 19.Ng5+ Kg6 20.e6 fxe6 21.g4 Bxg4 22.Qxg4 e5 23.Ne6+ Kf6 and 24.Bg5+ is at least winning.>
why wouldnt black play 20...Bxd1 taking the queen? White takes back with 21.exd7 and then what? Yes, you are right. So after 21.exd7 Rxd7 22.Rxd1 Nxc3 23.Re1 perhaps and white is likely worse. |
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Apr-24-09
 | | Jimfromprovidence: I looked at the position after 19...Qe8.
click for larger view In this position, it looks like white has a lot of forcing moves available to win material. 20 Ng5+ Kg6 (Kg8 or Kh8 is mate in two) 21 g4 f5 22 gxh5+ Kh6 (if Kf6 Nh7#) 23 Nf7+ Kh7 24 Nxd8 Qxd8. 
click for larger viewWhite is up a rook, bishop and pawn vs. two knights. |
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| Apr-24-09 | | cheeseplayer: Even I spotted Bxh7+ in a glance!
and for my surprise i had two possibilites for the game if Kxh7 then e6!
if Kh8 then e6! again!!
don't ask me why!!
the problem is i had even more possibilites for black to play and tactics for white to play all leading to a win or better position for white. My 64000 dollar question here is.. Do I count this as a win? solving the puzzle with more than one solution? I want to get 7/7 this week! |
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| Apr-24-09 | | YouRang: Aw heck. I saw Bxh7+, but I didn't see e6.
But at least I satisfied myself (after a great deal of effort) that Ng5+ didn't go anywhere. :-p |
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| Apr-24-09 | | Zzyw: I knew this one from memory. Black should play 17...Ne4 I believe I read somewhere that Korchnoi had planned to reply with 19...Bxf3 20.Qc2+ Be4 and overlooked white had 20.Qd3+ Be4 21.Qh3+, winning the queen. |
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| Apr-24-09 | | cheeseplayer: After spending a little more time on it, i think:
whatever black's reply is going to be to Bxh7+, e6! wins the game for white. i'm counting this as 5/5 |
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| Apr-24-09 | | dhotts: <agb2002> <What about line A.1.c A.1.c) 20... Kg8 21.Qxh5 Rf5 22.Qh7+ Kf8 23.Nxe6+ + -.> Would Black be better with 21...Rf6 protecting the e-pawn? Doesn't this save Black? Am I missing something?
Best Regards,
dh |
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| Apr-24-09 | | GreenFacedPatzer: I saw Bxf7
and figured if ... KxF7, Ng5+ with mate to follow as the queen comes roaring out for the kill. I didn't spot that Black had any defense after Ng5+, as <apple_pi> points out. So that's my first mistake. Second, I couldn't see much of a way forward for white if Black simply declines the sacrifice with 18... Kh8. Black seemed to have significant defensive resources in g6, Qg4, Nf5 and so fourth. So, so far as I could figure, Bxh7 Kh8 led to white winning a pawn only. Still, I'd'a took the pawn. :) I'll give myself 10% credit for this one. |
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| Apr-24-09 | | johnlspouge: Friday (Difficult):
Huebner vs Korchnoi, 1987 (18.?) White to play and win.
Material: B for N. The Black Kg8 has 1 legal move. The White Bc2 attacks h7, which the White Nf3 can reach in one move. The Black Bh5 pins Nf3 to Qd1, giving the opportunity for a discovered attack, as always (from an optimist’s perspective). The White Bc1 is available to control dark squares within the Black K-position. The White Rs and Qd1 require activation, which on the open board, will come rapidly if White gains the initiative. The White Kg1 is secure from check. Candidates (18.): Bxh7+, e6
Black is better after
18.Bxh7 Kxh7 19.Ng5+ Kg6 20.Qd3+ Qf5
so White should activate his pieces before the obvious sacrifice Bxh7+. I tried 18.e6 19.Bxh7 but timed out realizing that there was no advantage. |
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| Apr-24-09 | | WhiteRook48: found 18. Bxh7+ but not 19 e6 |
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| Apr-24-09 | | DarthStapler: I got the first move |
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| Apr-25-09 | | TheBish: Huebner vs Korchnoi, 1987 White to play (18.?) "Difficult" (3 stars)
Well, the first comment I have to make is... wow, Korchnoi in trouble after only 18 moves?! I suppose it happens to the best of them. (I seem to remember a game Karpov had to resign after nine moves or so, because he overlooked a simple tactic, a double attack). Candidate moves: Bxh7+, e6
I figured there must be an attack with the combination of Bxh7+ and Ng5+ (and either Qxh5 or an attack on the king moving forward to defend the bishop), or maybe e5-e6 first, followed by the above. 18. e6 This weakens the king position and cuts off the Black queens defense. Now: A) 18...Bxf3 This gets rid of a key attacker, avoiding a future knight check on g5 after the bishop sac. Now 19. Qd3 Be4 (forced) 20. Rxe4 (only try for an advantage) dxe4! (20...fxe6 21. Rh4 Nf5 is also better for Black) 21. Qxd7 (forced, since 21. Qxe4?? Qd1+ mates in two more moves) Rxd7 22. exd7 Nxc3 23. Bb2 Ned5! 24. Re1 Rd8 25. Bxe4 Nxe4 26. Rxe4 Kf8 and after ...Rxd7 Black will be a solid pawn up in a winning endgame. But White can try 19. Bxh7+! Now:
A1) 19...Kh8 20. Qxf3 fxe6 21. Qh5 with a winning attack. A2) 19...Kxh7? 20. Qd3+! Be4 21. Qh3+ followed by 22. exd7, winning the queen. B) 18...fxe6! 19. Bxh7+ and now:
B1) 19...Kxh7 20. Ng5+ Kg6 (or 20...Kg8 21. Qxh5 with a winning attack, or 20...Kh6 21. Nf7+! Kg6 (21...Kh7 22. Qxh5+ Kg8 23. Ng5 transposes to 20...Kg8 line) 22. Ne5+ Kf6 23. Qxh5! (stronger than taking the queen because of the mate threat) g6 24. Qh6! Qd6 (God save the queen) 25. Bg5+ Kf5 26. g4# - but not the king! B2) 19...Kh8! I can't find a follow-up here. So 18. Bxh7+ must come first! ~~~~~~~~~` 18. Bxh7+! Now 18...Kxh7 19. e6! transposes to lines above, so all that is left to look at is 18...Kh8 19. Bc2! Nxc3 (everything else leave Black a pawn down with no compensation) 20. Qd3 Ne4 (forced) 21. Ng5 Nxg5 (or 21...Bg6 22. e6! followed by 23. Qh3+ and attack continues - see transposition below) 22. Bxg5 Bg6 23. e6! Bxd3 (or 23...fxe6 24. Qh3+ Kg8 25. Nxe6 Bf5 26. Nxf8 Bxh3 27. Nxd7 Bxd7 and White has won an exchange) 24. exd7 Bxc2 25. Bxe7 and wins. Well, that's enough time spent on this one (now that I've overstepped the time "limit"). Time to see the game and move on to the next one! |
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Kibitzing
sac: 18.Bxh7+