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| Aug-27-08 |
| znprdx: Sorry - I don't buy that anyone here 'saw' 37.Nf6 because the King capture is not forced - simply Qe6 gives Black a quite playable game. Of course given this is a puzzle one might find eventually 'find' Nf6 but these type of 'ghost in the position' moves (the imaginary Arab mate and 7th rank skewer threats) are rarely found OTB - although in time pressure sometimes we blunder into good moves :) As for the brillancy prize - this move gets my vote not Ng5 which was just good chess |
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Aug-27-08
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| whiteshark: I looked on the b-file for some action, then on the 5th rank. Well Qg3 was still under attack. So I have to solve this issue first. This way I found it. 3/3 |
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| Aug-27-08 |
| BlackWaive: Wednesday.
Candidate Moves:  f4,  xe4
Black's encampment is very well defended - his pieces are oriented so as to prevent any strong White attack. Furthermore, White's Queen is under attack. Avoiding both of these problems is the move 36. f4
which looks promising, but after
36...f7
Black is prepared to exchange Queens, and the position seems drawish. Situations like these usually require the removal of a defender, and the only move I see which does so is 36. xe4
which may only be recaptured by the Rook,
36... xe4
and I now notice that White would have a nasty Queen/Rook fork via Nf6 if not for the King on g7. However, King captures in the middlegame are generally weak, since they tend to expose the King. 37.  f6  xf6
Now the Black King has indeed exposed himself to the White Queen, allowing 38. f3+
forking the Rook and the King, and ultimately winning the exchange. The entire process took about four minutes. |
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Aug-27-08
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| johnlspouge: <<znprdx> wrote: Sorry - I don't buy that anyone here 'saw' 37.Nf6 because the King capture is not forced - simply Qe6 gives Black a quite playable game.> I was also surprised at the capture, so I ran the position through Toga II 1.3.1 under the usual Mom-and-Pop conditions. (Humans can improve near the end of the full computer variation.) [ply 15/67+ time 04:55 value (to White) +4.06]
37…<Kxf6> 38.Qf3+ Kg7 39.Qxe4 dxc3 40.h5 Ne7 41.Rb8 g5 42.Qf3 Qd4 43.R1b6 Qf4 44.Qxc3+ Kf7 45.Rf8+ Kxf8 46.Rf6+ Qxf6 47.Qxf6+ Kg8 48.Qb6 Nc8 49.Qe6+ Kg7 50.Qxc8 [ply 15/58 time 02:41 value (to White) +1.98]
37…<Qe6> 38.Nxe4 Qxe4 39.Rb7+ Rxb7 40.Rxb7+ Ne7 41.Rc7 d3 42.Qe3 Qxe3 43.fxe3 Kf6 44.Rxc4 Nd5 45.g5+ hxg5 46.hxg5+ Ke5 47.Rd4 Nxc3 48.Rxd3 Ne4 49.Rd4 Nxg5 50.Rxa4 According to Toga, refusal of the sacrifice <is> better, but the position is hardly "playable" against a GM. Perhaps Taimanov felt he had to respond to the implicit challenge in 37.Nf6. In fact, consideration of sacrifice refusal is an integral part of my puzzle "routine", although now it rarely requires any explicit calculation. |
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| Aug-27-08 |
| zb2cr: <znprdx>,
You wrote: "Sorry - I don't buy that anyone here 'saw' 37.Nf6 because the King capture is not forced - simply Qe6 gives Black a quite playable game." Uhmmm...guess again. 37. Nf6, Qe6; 38. Nxe4, Qxe4. Black is down a full exchange here, too. You're calling that "playable"? Since you are, in effect, calling me and several others liars, I'm going to call your idea that Black has a playable game a full exchange down laughable. |
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| Aug-27-08 |
| zb2cr: And a P.S. to <znprdx>: Crafty 20 agrees with me that White has a winning edge after 37. Nf6, Qe6; 38. Ne4, Qxe4. Here is the analysis dump,
slightly formatted:
depth=17 +2.31
39. Qg2, Qxg2+; 40. Kxg2, dxc3; 41. Rc1, Nd4; 42. Rb4, Ne2; 43. Rc2, Nf4+; 44. Kg3, Nd5; 45. Rxc4, Ra5; 46. f4, Kf7; 47. h5, gxh5; 48. gxh5, Ke6. Nodes: 1465359427 NPS: 1829823
Time: 00:13:20.82 |
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Aug-27-08
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| benjinathan: Inexplicably, I thought this was easy.
I saw this game today which also involved an easy knight fork combination which was missed by the players and I wondered whether there is something about these positions which conceals the combo. D King vs Larsen, 1990 35. white to move:
click for larger view |
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| Aug-27-08 |
| eblunt: <znprdx> After Qe6 instead of the king recapture Black is Knight for Rook down with absolutely nothing as compensation. That's game over at GM level, not <quite playable> ROFL ! And yes I saw it, both with the re-capture and Qe6. It's about right for a Wednesday IMO. |
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| Aug-27-08 |
| DarthStapler: I almost got it, I just missed the last move |
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| Aug-27-08 |
| newzild: It took me a full five minutes to get this one. At first I had the horrible thought I'd be defeated by a Tuesday, then I had one of those "Ahhhhhh...." moments. 6.Bxe4 Rxe4
And now
37. Nf6! forks the big boys.
37...Kxf6
38. Qf3+ Kg7 39. Qxe4
Cute!
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| Aug-27-08 |
| newzild: ...I mean, defeated by a Wednesday.
Is it Wednesday already?
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| Aug-27-08 |
| zb2cr: <newzild>,
You wrote: "Is it Wednesday already?"
I thought you were a New Zealander transplanted to Korea--for you, it's almost Thursday! |
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| Aug-27-08 |
| newzild: Wow, you're right. It IS Thursday now... |
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Aug-27-08
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| YouRang: Phfft. I saw 36.Bxe4 Rxe4 almost automatically, but for some reason I didn't spot the clever knight fork: 37.Nf6! which wins the exchange one way (38.Nxe4) or another (37...Kxf6 38.Qf3+ & Qxe4). The white rook on b5 prevents the black K from defending his rook as he escapes check, e.g. 38...Ke5. |
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Aug-27-08
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| kevin86: I saw that if black's king were at g8 of h7 in the puzzle position,that Nf6+ woukd have been a family check. I missed the tactical possibility that the fork on queen and rook could be employed. |
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| Aug-27-08 |
| MiCrooks: I don't understand how Qe6 gives Black a playable game? Seems like it is as least as bad as the game line. After Nxe4 Qxe4 White is still up the exchange and it would seem that after something like Rb7+ he would have a dominating position. |
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Aug-27-08
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| SpoiltVictorianChild: what was yesterday's puzzle? |
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Aug-27-08
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| A.G. Argent: <Once> Yep, Dr. J. Nunn, see <notyetagm>'s compilation of some excellent examples of said LPDO'ing. |
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Aug-27-08
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| ChessGeezer: <znprdx>, I saw 37. Nf6! and I am one of the lowest rated puzzle solvers here (USCF rating under 1200). That may be because I did not analyze the declined sacrifice as carefully as I should have. The moves all looked (more or less) forced to me. I would have played this OTB. I'm not sure that really counts as a solved puzzle, but I am going to count it as solved. For once I found one that others thought was harder to see! Usually I read comments like, "This one was easy for a (insert day of week here)". |
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Aug-27-08
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| TheaN: 2/3
No comment. |
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Aug-27-08
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| benjinathan: <ChessGeezer> We appear to be in chess for the same reason and both found the solution. I wonder if that is because kids see knight forks all the time and we learn to be esecially cogniscent of them? |
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Aug-27-08
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| Kasputin: Missed it. I tried to find something tactical - looked at the queen, looked at the knight, at the rooks (both colours), but it didn't come together for whatever reason. |
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| Aug-27-08 |
| 456: Tuesday puzzle Aug-26-08 <70. ?> Anand vs P Thipsay, 1987 |
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Aug-28-08
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| patzer2: For the Wednesday August 27, 2008 puzzle solution, White sets up a winning double attack with 36. Bxe4! Rxe4 37. Nf6! Kxf6 38. Qf3+  .The decoy Knight Fork adds to the entertainment and surprise value of White's combination. |
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| Oct-18-09 |
| ozmikey: Two stunning knight "sacs" in the one game!
Could Black have held on just by sitting on the position rather than opening things up by 32...e5 though? The dark-square weaknesses, the BP on e6 and White's control of the b-file are all unpleasant I guess... |
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sac: 37.Nf6
