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|Feb-04-09|| ||johnlspouge: Wednesday (Medium/Easy)
J Klovans vs O Kalinin, 1986 (24…?)
Black to play and win.
Material: B for N. The White Kh1 is stalemated. The Black Bb7 is on the a8-h1 diagonal with Kh1, obscured by the White Pf3 and Pg2, suggesting removal of the Ps as a plan for Black. The Black Qe3 controls critical dark squares near Kh1 and pins Nd3 to Qa3, which is loose. The Qe3 is under attack from Nf1, however. The Black Nf4 is in the area, able to move Nxg2 to remove Pg2. It can move …Nh3 or …Ne2 to set up the mate threat …Qg1#. Both Black Rs require activation. The Black Kg8 is the semi-open a2-g8 diagonal, but presently secure from checks.
Candidates (24.): Qxf3, Bxf3, Nxg2, Ne2, Nh3
24.Qxf3 (threatening 25.Qxg2#)
Black cannot accept the sacrifice:
(1) 24…gxf3 25.Bxf3+ Kg1 26.Nh3#
The White Kh1 cannot flee and there is no interposition. Black must therefore defend g2 against the mate threat.
(2) 24…Ne1 25.Qxf1#
(3) 24…Qb2 [or Rd2] 25.Nxg2
On capture at g2, Black has 26.Qxg2#, but on other moves, the threat of 26.Nf4+ followed by the mate from Variation (1) leaves White with unsolvable defensive problems.
|Feb-04-09|| ||YetAnotherAmateur: My line (which does not appear to be listed so far):|
24. ... Qxf3 25. Rd2 Nxg2 26. Qb2 Ne3+ 27. Kg1 Qh1+ 28. Kf2 Qg2+ 29. Ke1 Qxf1#
Obviously white is still finished after Nxg2.
|Feb-04-09|| ||njchess: 24. ... Qxf3 is pretty obvious. 25. gxf3 Bxf3+ 26. Kg1 Nh3++; delaying the inevitable is 25. Rd2 Nxg2 26. Kg1 Nh4 and White should resign. Time to check.|
7. d4 and 9. dxe5? cause White to lose the center. Re1 would have been better. 16. Qa3? just hands the initiative to Black.
|Feb-04-09|| ||LoveThatJoker: <However after 27...Qe3+ 28. Rf2 Nf3+ 29. Kf1 (Beautiful for Black is 29. Kg2?? Ng5+! 30. Kg1 Nh3#) 29...Nxh2+ 30. Rxh2 (30. Kg1 Qxg3+ winning) 30...Qxg3 31. Kf1 Qxh2 Black wins.>|
A way better line than what I've highlighted is 27...Qe3+ 28. Rf2 Nf3+ 29. Kf1 (Beautiful for Black is 29. Kg2?? Ng5+! 30. Kg1 Nh3#) 29...Nxe5 with a tremendous attack.
|Feb-04-09|| ||Knight101: As White, I would have played 24.gxf3 to stop Black mating attack and win a queen. As Black 23...Qe2 threatening g2-square. Black needed to bring into play a rook a long h-file as Black's queen is now trapped without any support to start a winning attack.|
|Feb-04-09|| ||viky: Interesting position!
black to play - Medium/Easy
24... Qxf3! if 25 gxf3 Bxf3+ 26 Kg1 Nh3+#
Instead of taking Queen white may try Rd2 ..
25 Rd2 Ne2! if again .. 26 gxf3 Bxf3+#..
white can exchange Rook with Knight but then..
26 Rxe2 Qxe2 and now 27 Nf4 Qf2 28 Qg3.. which should be good for black..
as he is pawn and a exhange up plus white king castle is all broken..
time to check..
|Feb-04-09|| ||viky: I missed the simple Nxg2 move!!|
|Feb-04-09|| ||kevin86: A third straight queen sac-but this time the play is not forced. Black wi8ll win material,however,if white does not allow the checkmate.|
|Feb-04-09|| ||zb2cr: I did not see the 25. Rd2 defense, but only the quick mate if White retook on f3. Half credit, I guess.|
|Feb-04-09|| ||YouRang: This puzzle would have been trickier had our queen had some escape square, or wasn't under attack. Since our queen appears to be trapped, we're sort of compelled to look for useful ways to sacrifice it. |
That brings the long diagonal into that has our bishop and white's king, and quickly one sees than 24...Qxf3! is safe due to 25.gxf3 Bxf3+ Nh3#. So we've saved our Q, gained a P, and to top it off, we've got a swell looking mating threat going ourselves. :-)
|Feb-04-09|| ||PinnedPiece: Got it in about 2 minutes. I spent too much time looking for a way to make the mate work with|
Then in about 2 minutes I saw the possibility of Nh3....
Then played it through with the right moves to the resignation.
|Feb-04-09|| ||cu8sfan: <YouRang: This puzzle would have been trickier had our queen had some escape square, or wasn't under attack. Since our queen appears to be trapped, we're sort of compelled to look for useful ways to sacrifice it.> I agree. I was thinking about 24...e2 and then mating on g2 but then found 24...xf3.|
As White, I thought about 25.e3 rather than 25.d2. After seeing 25.d2 I would probably have played 25...e2. There's really more than one way to win this.
|Feb-04-09|| ||Kasputin: 24 ...Qxf3
This move threatens mate of course. A response like 25. Nxf4 would allow black to capture the white queen with ...Qxa3. Capturing the black queen with 25. gxf3 and the following takes place ...Bxf3+; 26. Kg1 Nh3#.
So what else can white do? Ne1 won't work because of the same queen capture described above. That leaves either 25. Rd2 or 25. Qb2
A) 25. Rd2 Nxg2
And white is in serious trouble. White can't capture the knight because it will be mate with ...Qxg2. Perhaps the only thing to do is to play 26. Kg1 but then black has ...Ne3 and if 27. Nxe3 then ...Qh1+ and the black queen can grab the rook on a1 next turn. And who knows, there may be something better than that.
B) 25. Qb2
Well perhaps black could still play ...Nxg2 but black could also play 25 ...Nxd3 and win the rook if the white rook recaptures on d3 and if 26. gxf3 then 26 ...Nxb2 to regain the queen. Also the f3 pawn is threatened with capture by the bishop. (Note: I don't think 26 ...Bxf3 should be played because then the white queen can come over to g2 - black still wins material that way and very likely the game as well, just not as much material).
Didn't have time today to look at this in great depth, but I think this should be enough...
|Feb-04-09|| ||gawain: Sweet. (I did not get it, unfortunately. I went for 24...Nh3, overlooking the fact that the black queen is en prise.)|
|Feb-04-09|| ||MiCrooks: So did Knight101 not bother to read anyone else's posts before posting?|
I think he's off in the numbering by one, and on Qe2 the rook lift to d2 wins the Queen (the sack no longer works) while his White move to "avoid" mate allows mate in two.
|Feb-04-09|| ||SamAtoms1980: I saw 24 ... Qxf3 25 gxf3 Bxf3+ 26 Kg1 Nh3# but not 25 Rd2 Nxg2 26 Kg1 Nf4. The small fish got away but I caught the big one.|
|Feb-04-09|| ||ZUGZWANG67: Hmm. Too bad. I missed 25. ...Nxg2. Instead, I figured 24. ...Qxf3 25.Rd2 Ne2 (diagram). |
click for larger view
But 25. ...Nxg2 seems stronger obviously. At least, I found White' s correct defense. It' s just that I missed Black' s (more) accurate move after 25.Rd2.
|Feb-04-09|| ||TheaN: Wednesday 3 February 2009
Material: /-\ /
Candidates: Nxg2, Bxf3, [25.Nxe3 ]...?; <[Qxf3]>
Okay, it should be obvious when viewing my candidates that Qxf3 did NOT flash my mind at all in the beginning. It was until I noticed 25.Nxe3 on my second look that Black should do something with his Queen. And then, the move becomes obvious.
<24....Qxf3!> now that is a strike, optimally utilizing the long diagonal for the diagonal pieces. White cannot take, making his work hard.
<25.gxf3 Bxf3† 26.Kg1 Nh3‡ 0-1> what a pretty pure mate. This pattern was unknown to me.
So, well, then what? The Knight on d3, pretty vital for White's defense, is pinned on his Queen, making 25.Ne1 and 25.Nxf4 impossible due to 25....Qxa3. The strange defense 25.Ne3?! is met by the calm 25....Qxe3!, just going back and winning a Knight, where the threat of 26....Bxg2 is pretty much unavoidable. No, White should try to protect g2 otherwise, either with Rd2 or Qb2.
<25.Rd2> now things become tricky. 25....Ne2?! fails due to 26.Ne1!. No, Black's only gaining move is:
<25....Nxg2 > and if we look at the remaining position objectively, Black is up two pawns for nothing, has an attack that is not very easy, if at all, to stop and the White moves narrow down to a few useless tries.
- The Knight is still pinned so it can't defend,
- 26.Qb2 making it a combination of both defensive moves fails on 26....Nf4† 27.Rg2 (Kg1 Nh3‡ 0-1) Qxg2† .
- 26.Rf2 fails on 26....Nf4†! with the exact same Queen sac as in the starting position.
- 26.Kg1 wastes a tempo, as Black can just retreat the Knight and threaten Nh3‡, as in: 26.Kg1 Nf4 27.h4 (Nxf4 Qxa3 ) Ne2† 28.Rxe2 Qxe2 , and an easy endgame for Black, IF the attack is stopped altogether.
<25.Qb2 Nxg2> and the only significant difference is that White may play:
<26.Nd2> ironically looking to threaten the Black Queen and removing the mating pattern, but:
<26....Qxd3 > forgets that a Knight is completely in due to the Knight blocking the Rook.
I hope this is all, time to check.
|Feb-04-09|| ||TheaN: Oh, how stupid: at one point I did review 25.Qb2 Nxd3!? but forgot about it: I think it's the easiest way to win for Black, although Nxg2 leads to the exact same threats. Well, I got all ideas.|
|Feb-04-09|| ||whiteshark: Today it was a 'successful recognitional lesson'. :D|
|Feb-04-09|| ||ZUGZWANG67: < TheaN <25.Rd2> now things become tricky. 25....Ne2?! fails due to 26.Ne1!. >|
After 24. ...Qxf3 25.Rd2 Ne2 26.Ne1, Black has 26. ...Qxf1 mate (diagram).
click for larger view
|Feb-04-09|| ||ZUGZWANG67: And after 24. ...Qxf3 25.Rd2 Ne2, White has 26. Rxe2, but after 26. ...Qxe2 27. Ne3 dxe3, the only defense I can see (I do not have a program-I' m currently at work :p) is 28. Rg1 (diagram). But then, White is a whole rook down and the e3-runner is a winner.|
click for larger view
I' m not saying that 25. ...Ne2 would be better (nor as good as) than 25. ...Nxg2. Only that it is not the most accurate, but still wins.
|Feb-04-09|| ||TheaN: <ZUGZWANG> O.O... knew I missed something there too... so 25....Ne2 is playable and winning pretty easily.|
I do consider one important factor there in 'not seeing it'. 25....Qxf3 and any possible reply from White (so consider 26.Rd2) change the position considerably, making 26....Ne2 27.Ne1? Qxf1‡ easier to spot than a move before... as Qxf3 is completely working without a clear refutation, I would've spotted Ne2 a move later.
|Feb-04-09|| ||ruelas007: took me really long but i got it 3/3 weehee|
|Feb-04-09|| ||SmotheredKing: This position is fairly easy, white´s K has no legal moves and the sacrifice Qxf3 cannot be accepted (25. gxf3?? Bxf3+ 26. Kg1 Nh3#), white recovers his pawn deficit with mate threats at g2, and 25. Rd2 allows ...Nxg2 with nasty threats that cannot be prevented.|
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