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Jul-16-11
 | | Phony Benoni: 
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<26.?>
This being Saturday, I looked first for queen sacrifices. After that, I have to admit nothing came to mind. Thought about 26.Nxf6 Rxe1 27.Nxd7+, but 26...Bxf6 is obvious. Thought about 26.Nd6 and trying to gang up on f7, but the  h6 is frustrating. Nor does attacking f7 by 26.Qc4 seem to lead to anything. So I sort of half decided on 26.Qd3 with vague threats to the  d7 and maybe playing Qxg6 after the sacrifice Bg6 fxg6. But it wasn't convincing. Turns out the key was to realize that the right idea was action on the long diagonal, and the target is the seemingly safe f6. 26.Bg6 makes way for 27.Nh7+, putting just enought pressure on f6 to crash through. The big question has to be if Black has better than taking the bishop. And this is Saturday, after all. |
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Jul-16-11
 | | sevenseaman: I fiddled around with the solid looking 26. Nd6 without getting anything
out of it.
Second day in a row I was being eluded by a tangible solution to
the POTD, the disappointment was beginning to hurt.
Then without anything specific on my mind I played 26. Bg6; perhaps
just to make room for Nh7+.
26. Bg6 exg6 27. Nh7+ ( Lol, a windfall! Both the replies, Kg8 and Kf7
further my cause, viz break up Black's f6 and g7 for a powerful
attack by the Q, B combination on the a1-h8 diagonal.) 27...Kf7 (the better move to buttress f6 than stay under check at g8.
I think I am on track)
28. Nhxf6 gxf6 29. Nxf6 Re1 (Understandable flailing!) 30. Rxe1 Be6?
31. Nd7 (dedicated creation of access to f6, g7; even Nh7 will do but
this attacks the enemy Q but the idea is vacating my line of fire) I think I can stop here as a White win looks imminent. 
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Jul-16-11
 | | An Englishman: Good Evening: There were too many elements to this intricate combination for me to put together in the right order so that White can break through Black's "kuped up" position. Could have been a Sunday. |
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| Jul-16-11 | | mario1031: <Phony Benoni> <"The big question has to be if Black has better than taking the bishop. And this is Saturday, after all.">
good question, I spent time looking at Nd6 as well, funny my first inclination was to move the bishop to make room for Nh7+ but i only spent a few seconds as i was looking for more immediate pressure.
I don't have an engine but what if black played 26...Bxh3, would that work? allowing for Nhg4 if needed to support the N on f6? complicated position for me. |
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Jul-16-11
 | | al wazir: I never came close to finding the game line. I decided the hell with it, OTB I would play 26. Nd6. I like posting a on the sixth rank. And even after peeking I don't see the win. What happens, for example, after 26...Be6 ? |
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| Jul-16-11 | | LIFE Master AJ: I looked at some sacks ... but eventually decided (after around ten minutes) on 26.g4. (I still like it, although it wasn't the answer.) The game continuation is very sharp, although I am not sure if its all best and/or forced. (I did not check anything with the computer.) |
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Jul-16-11
| | sevenseaman: I checked with Crafty. My fluke solution as well (as well as the game continuation) does not seem to work. Crafty defends by refusing the B on g6 and plays Kg8 ( I thought it would be simple if 26. fXg6.) So far all my alternative attacks have collapsed against the EGT. |
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| Jul-16-11 | | stukkenjager: 26.Bg6 Kg8
(26...Re6 27.Nxe6+ Bxe6 28.g4)
(26...Rxe4 27.Bxe4) (26...fxg6 ??)
27.Qd3 fxg6 28.Nxf6+ Bxf6 29.Bxf6 Bf5 30.Qc4+ Kh8 31.Be5
white is winning here
26.g4 looks ok too, and what about 26.Ted1 |
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| Jul-16-11 | | stukkenjager: 26.Rd1 Ra7
(26...Qc7 27.Rd6 Be6 28.Nxe6+ Rxe6 29.g4)
27.Rd6 Be6 28.Rfd1
As g4 looks ok as well, I'm not sure what the best solution for today should be. |
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| Jul-16-11 | | Phil Holden: Is this the same Cooperman? http://www.youtube.com/watch?v=iwd9... |
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| Jul-16-11 | | newzild: I got it, but my main line was different towards the end: 26. Bg6 fxg6
27. Nh7+ Kf7
28. Nhxf6 gxf6
29. Nxf6 Rxe1
30. Rxe1 Be6
And now instead of 31. Nd7 I had:
31. Rxe6 Kxe6
32. Qe3+ Kf7
33. Qe8+ Kg7
34. Nh5++ Kh7
35. Kh8# |
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| Jul-16-11 | | newzild: Hmm. Interesting to see that some strong regulars didn't get it. For my part, I didn't consider some lines, such as Black's refusal of the sac. |
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| Jul-16-11 | | TheMacMan: this puzzle is a masterpiece. good job chessgames.com |
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| Jul-16-11 | | Creg: The position appears to be calling out for something to happen on the kingside. White has all his pieces aiming that way, while black has a queen and rook out of the equation. I first looked at taking on f6, but that lead nowhere. Then I realized that the knight at f6 couldn't move due to whites queen and bishop battery on the dark diagonal. That's when I thought about hitting f6 one more time with the other knight, but how? That's when I looked for a clearance, or forcing move, such as 26. Bg6. The idea is simply to clear the h7 square for the knight at g5. The following exchanges lead to opening blacks position like a can opener, and that was good enough for me. |
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| Jul-16-11 | | Rosbach: Black has no options to turn the game around after 26. Bg6. 26...Be6, 26...Rxe4 both lead to defeat. Black cannot escape white's tower. |
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Jul-16-11
| | sevenseaman: <newzild><I got it, but my main line was different towards the end:> The game score, you and me have relied upon 26...fxg6, a non-forcing move. You've hit a brilliant practical line. However the game turns White's way as soon as Black accepts the initial B sac. Nd7 or Rxe6, the brunt of the idea is to obtain control of the long a1-h8 diagonal; thereafter its only hide and seek in an open field. |
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| Jul-16-11 | | newshutz: I looked at Bg6, but did not see a good continuation for white after 26...Kg8 |
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Jul-16-11
 | | kevin86: The object of all of this is to open the long diagonal for the bishop and queen. |
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| Jul-16-11 | | tbentley: Rybka discovered 26. Bg6 Kg8 27. Nxf7! Nxf7 28. Bxf7+ Kxf7 29. Ng5+ A. 29...Kg6 30. g4 Kh6
A1. 31. Qc2 g6 32. Qf2 Rh8 33. Nf7+ Kg7 34. Nxh8 Kxh8 35. Qxh4+ Kg8 36. Bxf6 Bxf6 37. Qxf6 A2. 31. Rxe8 Bxe8 32. Qe1 Bh5 33. Qxh4 g6 34. Nf7+ Kg7 35. Nxd8 Qxd8 36. f5 A21. 36...Kg8 37. Bxh6 Qd2 38. gxh5
A22. 36...Qe7 37. fxg6 Kg8 38. Qxf6 Qxf6 39. Rxf6 Bxg6 40. Rxg6+ B. 29...Kg6 30. Qd3 Be6 31. Qg6
B1. 31...Qa7 32. Bxf6 Bxf6 33. Qh7+ Kf8 34. Rxe6 Rxe6 35. Nxe6+ Ke7 36. Nxg7 bxc5 37. Re1+ Kd8 38. Ne6+ Kc8 39. Qf5 Kb7 40. Qxf6 B2. 31...Be7 32. Nxe6+ Bxc5+ 33. Nxc5 Rxe1 34. Rxe1 Qf8 35. Ne6 Qe7 36. Qxe7+ Kxe7 37. gxh4 C. 29...Kf8 30. Qd3 Rxe1 31. Rxe1 Qa7 32. Qg6 Be8 33. Nh7+ Kg8 34. Nxf6+ Bxf6 35. Rxe8+ Rxe8 36. Qxe8+ Kh7 37. Qh5+ Kg8 38. Bxf6 gxf6 39. Qg6+ Kh8 40. Qxf6+ Kh7 41. Qxh4+ |
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| Jul-16-11 | | DrMAL: Looking back on where black went wrong, it seems he first took the wrong pawn (15...Nxe4 was correct) but did not get punished as much (either rook on e1 for move 18 was better). But then black executed his flank attack poorly (if that is what he was trying for, as he should have done) by not getting his queen active (e.g., 20...Qc8 followed by Nh5) and being inconsistent (21...b6 was a mistake no time for diversion). By move 26, white has several ways to win, 26.g4 may be even stronger but 26.Rd1 or 26.Qd3 or simply 26.Kg2 also work. The blunder 26...fxg6 lost much faster. Nice game for white! |
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Jul-16-11
 | | David2009: D Gurevich vs C Kuperman, 1978 White 26?
Missed this by the proverbial country mile. I looked at 26.Bg6 fxg6 27 Qc4?? before deciding on 26. Qf3 intending to follow up with 27.Nxf6 or 27.Bxf6 depending on Black's response.
Here's the puzzle position:
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and here's a link to Crafty End Game Trainer:
http://www.chessvideos.tv/endgame-t... 26.Bg6 the EGT plays 26...Kg8 and like <sevenseaman> I couldn't find the win unaided. So I used electronic help (Fritz 12) to generate the following line which beats the EGT:
26... Kg8 27.Qd3 fxg6 28.Bxf6 Bf5 29.Qc4+ Be6 30.Nxe6 b5 31.Qc3 Rxe6 32.Bxg7 Nf7 33.f5 gxf5 34.Rxf5 Rg6 35.Be5 to reach 
click for larger viewHere the EGT plays 35...Qb7!? and loses quickly to 36.Ref1 Qd7 37.Rxf7 Qxf7 38.Rxf7 Kxf7 39.Qd3 etc: a more spirited line is 35... Nxe5 36. Rxe5 Bc7 when Fritz 12 finds 37.Nf6+! Rxf6 38.Rg5+ Kf7 39.Qd3 etc. I also tried my luck with 26.Qf3 and the magic of Fritz 12 again beats the EGT: 26.Qf3 Bxh3 27.Nxf6 (if 27.Bxf6 Bxf1) Bxf6 28.Bxf6 Bxf1 29.Be5! Rxe5 30.fxe5 Bb5 31.a4! (winning the Bishop) bxc5 32.axb5 cxb5 33.gxh4
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and White's attack and extra piece easily outweigh Black's Pawns. Question: Is it useful to present these winning lines or does this spoil things for other solvers? Should I just present the Crafty EGT link? - I have recorded, rather than discovered, these winning lines. |
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| Jul-16-11 | | newton296: <tbentley: Rybka discovered 26. Bg6 Kg8 27. Nxf7! Nxf7 28. Bxf7+ Kxf7 29. Ng5+> to bad you don't have houdini!! because houdini finds a better line starting with Rd1! check it out! houdini just barrels down the D file with the rooks and black falls apart! Dimitri Gurevich - Carlos Kuperman, URS 1978
click for larger viewAnalysis by Houdini 1.5a x64:
1.  (5.65): 26.Rd1 Qc7 27.Rd6 Be6 28.Rfd1 b5 29.Nxe6+ 2. (2.93): 26.Bg6 Re6 27.Qd3 bxc5 28.Nxf6 Bxf6 29.Qxd7 Rxe1 30.Rxe1 Bxg5 |
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| Jul-16-11 | | DrMAL: <David2009: Should I just present the Crafty EGT link?> You did (again) but it is better than daily regurgitations of engine output (especially with diagrams) just saying. Maybe I am wrong but I thought the purpose of puzzle is to think and maybe kibitz on what we thought, not compare engines, cheers. |
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| Jul-16-11 | | Quentinc: <David2009>, despite the obnoxious reply you have received, I find it useful. Obviously the idea is to try to find the best lines for each side on our own, but here nobody came close. It's nice to be able to compare one's thought process with what is, unfortunately, the ultimate arbiter. For people who want to find the winning line on their own, they can just stop reading your post at the link. |
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Jul-16-11
| | sevenseaman: <David2009> cheers for the exemplary hard work you must have had to put in to squeeze out a win against EGT. I liked going over it. As <DrMAL> points out, our primary aim in attempting POTDs is to exercise our own mind/cerebral muscle and find the best moves. Too bad if we do not always succeed. The more we try on our own the better. Failure at times teaches a lot. If we kept that in mind then going for outside help is only a matter of having the time, resource and the inclination. For instance I do not always wrestle with EGT; its time consuming. I do not have any other electronic analyzer. Basically its me and the puzzle. So I will say your EGT link is a convenient option that I sometimes use depending upon availability of time. It does widen one's horizon on defensive options. For instance today I should have thought of Black declining the initial B sac but didn't. Gurevic got the same breaks. Its sort of part of the game - its never played perfectly as we all know. |
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