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| May-26-09 | | YouRang: Well, it's evident that white would have Nf7# if not for the black queen, so the natural thing to do is look for a queen deflection. And what else but 32.Qd6 for that? Not only is the queen immune, but it even adds another mate threat via Qxf6#, and black has no good way to defend against both. |
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| May-26-09 | | MaxxLange: sounds like lots of people didn't concern themselves at all with White's hanging Knight |
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| May-26-09 | | MiCrooks: No concern about knight - just means White's move needs to be of a forcing nature. Qd6 fits the bill. You had to see the mate threat with Qf6+ but that was pretty clear. The fact that the knight is hanging almost makes the move easier to find. It forces you to ignore any sort of waiting move, or at least to know that you have a winning response to fxe5. |
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| May-26-09 | | Patriot: <MaxxLange: sounds like lots of people didn't concern themselves at all with White's hanging Knight> I'm not sure if anyone didn't notice the knight hanging, but as far as calculation goes you are absolutely right. 32.Qd6 fxe5 IS a critical line to consider, but a little more calculation (33.Qf6+ Qg7 34.Qxg7#) shows that it doesn't work out so well for black. So it is necessary to either see this by pattern recognition or by simple calculation. Otherwise some may have just gotten lucky in solving this, because theoretically 32...fxe5 could have been a good refutation. In that case they would be saying "Darn! I didn't think about taking the knight!" |
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| May-26-09 | | outplayer: Easy? This was a real cassetête. I have thought for almost 12 minutes before finding 32.Qd6! |
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| May-26-09 | | Aurora: Solution is 32.Qd6! to deflect Qc7 from guarding square f7. |
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| May-26-09 | | wals: <outplayer cassetete ? >please define it aint in my vocabulary. |
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| May-26-09 | | njchess: 32. Qd6 is a subtle example of deflecting/attacking a critical defender. I suspect some will get it pretty quickly, but it is far from obvious. I suspect Korchnoi saw it too, much to his dismay. White does a decent job of slowly applying pressure without ever really giving Black an opening. Korchnoi plays somewhat passively and eventually White captures the center and then leverages it for the kingside attack. Black's play begins to go awry with the innocuous move of 14. ... g6. Korchnoi, obviously concerned with the half-open g-file in front of his king, coupled with the fact that White's dark squared bishop is off the board, probably thought this was a sound, flexible, noncommittal move. It is, but it also weakens his kingside; it isn't necessary since there is no attack yet; it doesn't hamper White in any way and, there are better, more active moves. Qc7 is a more active option. 18. ... a5 is played with the idea of resolving the queenside to Black's advantage. However, the center is not locked, so a5 is a bit premature. 18. ... f6 is a playable alternative ( 18. ... f6 19. Kh1 Nxc3 20. Qxc3 Qc7 21. Qd3 Rfd8 ∞) 20. ... Ba6 is fine though Rb8 is a good alternative (20. ... Rb8 21. Qa4 Ba6 22. Ne5 Bb5 23. Nxb5 cxb5 24. Qb3 a4 25. Qa2 Rc8 ∞) 30. ... f6?? is a mistake. 30. ... Kh8 would have been much better (30. ... Kh8 31. Qd6 Qxd6 32. Nxf7+ Kg8 33. Nxd6 Rd8 34. Rg1+ Kf8 35. Nxf5 Bd3! ∞). White's pawn advantage is offset by Black's strong bishop. Korchnoi's somewhat passive play left little room for error. When it did occur, White pounced decisively. |
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| May-26-09 | | zenpharaohs: MiCrooks: "Zen it's not that people would think that their threats would be enough, but that winning the Queen ensures winning the game, AND no one would even bother to look at your Rybka line because not only do I win the Queen but both Rooks as well! You don't need to work the position out to mate to know you will win." A: The mating threats are more valuable in this position than the material, since whatever Black does, White will mate him. B: As I mentioned in my post, I didn't calculate all the lines before deciding on Qd6. |
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| May-26-09 | | MaxxLange: <I'm not sure if anyone didn't notice the knight hanging, but as far as calculation goes you are absolutely right. 32.Qd6 fxe5 IS a critical line to consider> Well, I for one didn't really notice that Black to move just takes the Knight until after I found the winning idea. In this case, it is no big deal. But it shows I was very hasty. |
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| May-26-09 | | Sleepyworker: As the saying goes: "Good thing he is checkmated, because he's about to lose his queen!"...or something close to that... |
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| May-26-09 | | Jack Bauer: I can’t help detesting my relations. I suppose it comes from the fact that none of us can stand other people having the same faults as ourselves. |
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| May-26-09 | | remolino: An easy Tuesday. Almost all got it. It seems Poohblah was in the minority. Good luck next time. |
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| May-26-09 | | Marmot PFL: <sounds like lots of people didn't concern themselves at all with White's hanging Knight> irrelevant here to white's threat of Qxf6+ and mate. Rc8 and Qc7 are overloaded pieces and white rook comes to g1 with check. Hence 30...f6 was a blunder, and Kh8 would have given black a playable game (easy to see in hindsight). |
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| May-26-09 | | outplayer: <Aurora>Cassetête means braincracker. |
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| May-26-09 | | MaxxLange: <irrelevant here to white's threat of Qxf6+ and mate> After 32. Qd6 fxe5, there is no Qxf6+ - just Qf6+ the f6 pawn just took your Knight as you say, it changes nothing in this position, since the Knight, which gives mate in the main line of the sacrifice, is not needed for the secondary threat of Qxf6 and mate in two. 32 Qd6 was truly an offer you can't refuse! A great tactical shot |
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| May-26-09 | | Aurora: <outplayer: Cassetête means braincracker.> Merci pour l'explication! |
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| May-26-09 | | psmith: OK, the puzzle is elegant but not too difficult to see. Personally, I am more interested in the strength (or not) of White's attack after 28. f5. What's the best defense? Any thoughts? |
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| May-26-09 | | Marmot PFL: < psmith > I think Korchnoi plays well in a difficult position until 30...f6? Instead after 30...Kh8 31 Qd6 Qxd6 32 Nxf7+ Kg7 33 Nxd6 Rd8 34 Nxf5+ Kf6 35 Ng3 Bc4 and black has compensation with his active king and play on the be file (Rb3). White might still win but against a player like Korchnoi it would not be easy. |
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May-27-09
 | | gawain: Yes, easy. Nf7 is the move that looms, and playing Qd6 now is how to force the issue. It threatens mate and deflects the Black queen. Pretty. |
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| Jun-01-09 | | patzer2: For the Tuesday, May 27, 2009 puyzzle solution, the decoy Queen sham sacrifice 32. Qd6! creates multiple threats and forces Black's resignation. |
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| Jan-11-11 | | theodor: why there is not an analysis for 28. ..;dxf?! |
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Apr-30-11
 | | GrahamClayton: Bauer replicates a tactic used in E Tate vs D Coleman, 1993 |
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| Aug-25-12 | | Cemoblanca: I would call this 1: "Korchn0i Coordination" (Zero Coordination)! ;0) After 21.Ne5! there was really 0 coordination in Korchnoi's game. The important squares (especially e4, c5) are securely under White's control. 23.Qc2! says already everything & by the way: It was the best plan (respectively best move) for White in this situation! One or the other can already smell the suppression of zugzwang! However, on the whole it was a single-sides affair! |
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Jun-30-21
 | | plang: In the 1994 New York Open Wojtkiewicz played 19 Ne5 against Wolff and went on to win the game; 18 b4 was new. Bauer was critical of 19..bxa?! recommending 19..b5 20 Bxd5!.exd 21 Nb6..Rb8 22 a4 with interesting play. Another possible line had Black played 30..Kh8 was 31 Rg1..Rf8 32 Rg5..f6 33 Rxf5..Qc8 34 Qe7..Qe8 35 Qxe8..Rbxe8 36 Nd7..Rf7 37 Nc5 with a favorable endgame for White. |
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