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| Sep-11-05 | | THE pawn: I missed 35.rh8+
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Sep-11-05
 | | patzer2: <Eric Xanthus> <Hmm. I was thinking 32.Bf6 instead> So was I, and according to Fritz 8, both 31. Bxg6! and 31. Bf6! transpose to the same winning line after a few moves. Analysis by Fritz 8 (@ 18 depth & 1373kN/s):
1.  (11.31): 31.Bxg6 hxg6 32.Rxg6+ Rg7 33.Bf6 Ba7 34.Rxg7+ Qxg7 35.Bxg7 Kxg7 36.Qh4 Kf8 37.Qh8+ Ke7 38.Qc8 Ne8 2. (11.31): 31.Bf6 Rg7 32.Bxg6 hxg6 33.Rxg6 Ba7 34.Rxg7+ Qxg7 35.Bxg7 Kxg7 36.Qh4 Kf8 37.Qh8+ Ke7 38.Qc8 Ne8 |
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| Sep-11-05 | | midknightblue: this was pretty tough
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| Sep-11-05 | | aw1988: I know this may start a riot, but I found this fairly simple. Is there a critical line which we had to see? |
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Sep-11-05
| | patzer2: Today's Sunday puzzle solution is the demolition of pawn structure combination 31. Bxg6!, which can be delayed for one move with 31. Bf6 Rg7 32. Bxg6!, transposing into the same winning line. Note that the last part of the combination is a mating attack, using a deflection (34. Rh8 Kf8) and two consecutive decoys (35. Rh8* Rg7 and 36. Rxg7 Kxg7 ) to set up a skewer with 37. Qh8+ Kf7 38. Qh7+ to win the Queen and mate shortly thereafter. |
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Sep-11-05
| | patzer2: <aw1988><Is there a critical line which we had to see?> The follow up move 33. Bf6! is a key to the combination as other alternatives (i.e. 33. Rh6?!  ) give Black counter play. |
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| Sep-11-05 | | aw1988: Oh, not hard for me then. |
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| Sep-11-05 | | billcrutcher: Well, I had a slightly different move order in two places. Like <Eric Xanthus>, I had 32.Bf6 Rg7 followed by 33. Rxg6, which transposes to the same position as the game. I did work out the line with 32. Rxg6+ Rg7 33. Bf6 but the only response I considered for Black was 33. ... Rxg6. I did work out the 33. ... Ne8 34. Rh6 line but I only had it recorded as a progression from the 32.Bf6 Rg7 33. Rxg6 move order. I failed to see 36. Rxg8+ in response to 35. Rh8+ Rg8, so instead, I worked out the win for 35. Bxg7+. There are 5 ways for Black to move out of check on move 35. Three of them lead to mate within 5 moves, and the other two result in an overpowering material advantage for White. I still give myself full credit for solving this one. It took me about 45 minutes to work out ALL the variations (there are a lot of them) but White has a forced win in every one. (What follows is my own analysis. Sorry for the depth of the parentheses, brackets; I think I have them right, except that the braces don't even show up at all. If I could have put the main line in Bold, I think it would have been easier to follow.) 31. Bxg6 hxg6 32. Bf6
(or 32. Rxg6+ Rg7 33. Bf6 Rxg6 34. Qxg6+ Kf8 35. Qh6+ Ke8 36. Qh8+ Kf7 37. Qg7+ Ke8 38. Qg8#) 32... Rg7
(or 32... Rh7 33. Qxg6+ Kf8 [or 33... Qg7 34. Bxg7 Ne8 35. Bh6+ Ng7 36. Bxg7 Bxe5 37. Bh6+ Bg7 38. Bxg7 Rxh2+ 39. Kxh2 b6 40. Bh6+ Kh8 41. Qg7#] 34. Qg8# 33. Rxg6 Ne8
(or 33... Rxg6 34. Qxg6+ Kf8 35. Qh6+ Ke8 36. Qh8+ Kf7 37. Qg7+ Ke8 38. Qg8#) 34. Rh6 Kf8
(or 34... Rh7 35. Qg6+ Rg7
[or 35... Ng7 36. Qxh7+ Kf8 37. Qh8+ Kf7 38. Qxg7+ Ke8 39. Qg8#]
36. Bxg7 Nxg7 [or 36... Qxg7 37. Qxe6+ Kf8 38. Rh5 threatening 39. R f5+,
winning the Black knight and queen, or, in case of 38... Bxe5, the Black
bishop and queen.] 37. Qh7+ Kf8
[or 37... Kf7 38. Rf6+ Ke8
or 38...  e7 39.  xg7+ d8 40.  f8+ c7 41. f7 xf7 42. xf7+ White has a winning advantage
39. Qg8+ Ke7 40. Rf7# (40. Qxg7+)]
38. Qh8+ Kf7 39. Rf6+ Ke7 40. Qxg7+ Ke8 41. Rf8#)
35. Bxg7+
a) 35... Nxg7 36. Rh8+ Ke7 37. Qg5+ Kf7 38. Qf6#;
b) 35... Kxg7 36. Rh7+ Kg8 37. Rxd7 White has a winning advantage;
c) 35... Qxg7 36. Rh8+ Ke7 (36... Qxh8 37. Qxh8+ White winning) 37. Qxe8#;
d) 35... Ke7 36. Qg5+ Kf7 37. Bf6 Qc6 38. Qh5+ Kg8 39. Rh8#;
e) 35... Kg8 36. Rh8+ Kxg7 37. Qh7#
1-0
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| Sep-11-05 | | billcrutcher: Oh, yeah. First time ever I've gotten a Sunday puzzle. This was fun to work through! |
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Sep-11-05
 | | jahhaj: I think this puzzle is sploit by the easy win of the exchange that White has (e.g. 31. f6 g7 32.h6). In a real game I would almost certainly go for that rather than trying to calculate the sacrifice. A simple matter of less risk and less effort. |
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| Sep-11-05 | | Eric Xanthus: <patzer2>: you mean 32.Bf6 works?! Hah. My ideas don't usually. What a charge! Anyway, re: the difficulty of the puzzle, it's not that finding a winning conclusion is difficult; it's checking all the other lines to make sure there is no way out for black (as <billcrutcher> says and demonstrates). It was a fun puzzle indeed. |
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Sep-11-05
| | jahhaj: <Insightful> 33.h7+ xh7 0-1 Oops! |
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| Sep-11-05 | | homersheineken: WHy in move 33 can't black take the rook? I don't see mate after that? |
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| Sep-11-05 | | pikoro: <homersheineken>33...RxR 34.Qh8+, Kf7
35.Qh7+, Rg7 36. Qxg7+, Ke8 37. Qg8++.
There is another variant without interposing the rook which also leads to mate. |
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Sep-11-05
 | | TheAlchemist: Incidentally, nedelja = Sunday (if Nedeljkovic is either Serbian or Croat, I don't know) - which would make Nedeljkovic = Sunday boy (very loosely), so this puzzle is appropriate even in this way :-) <chessgames> Did you guys know that, or it's just a coincidence? :-)) On the other hand, however, Srecko = lucky, so that didn't quite suit him |
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Sep-11-05
| | jahhaj: <pikoro> I don't think your line works, 33...xg6 34.h8+ f7 35.h7+ e8 36.xg6+ f7 and black has escaped. Instead 33...xg6 34.xg6+ f8 35.h6+ e8 36.h8+ f7 37.g7+ e8 38.g8# wins. |
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Sep-11-05
 | | al wazir: Like everyone else posting comments I saw the attack with 31. Bxg6 and 32 Rxg6+, and foresaw the subsequent white attacking moves (Bf6, Rh6, and Rh8+), as well as the defensive moves (Ne8, Rg7, Kf8). What I didn't do (like almost everyone else) was calculate the whole 10-move combination. I think that OTB I would have played 31. Bxg6 speculatively, without trying to do the whole calculation. Black is clearly busted, almost in zugswang. But do GMs think differently from the rest of us? Does anyone know whether Korchnoi did the calculation in advance? Did he know how it would come out before he played 31. Bxg6, or was he just pretty sure that it was a win? Did he ever publish annotations to his games? And if it was just a speculative sacrifice would he admit it? <TheAlchemist: Incidentally, nedelja = Sunday (if Nedeljkovic is either Serbian or Croat, I don't know) - which would make Nedeljkovic = Sunday boy (very loosely), so this puzzle is appropriate even in this way :-)> I don't know SerboCroatian, but in Russian nedelja = week. |
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| Sep-11-05 | | blingice: For some reason, I saw the initial move but not the continuation and accepted the initial move instantly. Isn't this supposed to be the hardest puzzle? Seemed rather easy. |
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Sep-11-05
 | | Gypsy: My comments are practically identical to <aw1988>. Instructive motive though, reminds me of a number of combo's from 'My System'. In Slavic languages, 'Nedele', or similar, indeed typically means 'Sunday'. Even in Russian 'nedelia' is used along side of 'voskresenie' for that; the term 'nedelia' for a 'week' is a derived meaning. The root of the word is 'delat', that is to 'do' or to 'work'. 'Ne' is a negation, thus 'nedele is a 'day of no work'. Nedeljkovic therefore indeed seems to be a 'Sunday Boy', but his name conceivably could be interpretted as a 'not-working fellow'. |
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Sep-11-05
 | | kevin86: Korchnoi's play,as usual,was briiliant-see how smart he is-he solved a Sunday puzzle,lol |
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Sep-11-05
| | jahhaj: <al wazir> I think it's certain that Korchnoi saw it all the way through to the end, and saw it accurately. Especially as there is a simple alternative which wins the exchange. Why risk a sacrifice when you can win more simply unless you are sure that the sacrifice wins. |
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Sep-11-05
 | | GoldenKnight: I don't have Fritz and I prefer calculating without moving pieces. I calculated the line given by <patzer2> with 33. Rh6, which he says offers Black counterplay. However, it seems that only 33. ... Rh7 holds any hope, but then I had calculated 34. Bf6, which looks to me like it wins similar to the game. It seems to me that the real key is to get Bf6 *before* Black plays Ne1, which I had also taken account of in my calculations. I would welcome any corrections here. I agree the Korchnoi is pretty incredible. He is featured a lot in Soltis' "Pawn Structure Chess" and he makes moves I don't even see other GMs make. |
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| Sep-11-05 | | pikoro: <jahhaj>Yes, you are right. I was capitalizing on a blunder by black to interpose the rook, if he doesn't, then in fact he does escape. If, however, the rook is taken with check on move 34, as you suggest, there is no way to escape mate.
This is what happens when you look for useless complications and post hurried analysis... |
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| Sep-11-05 | | LIFE Master AJ: Very nice - Black loses his Queen.
(37...Kf7; 38.Qh7+, winning.)
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| Sep-11-05 | | Madman99X: I got the first three moves, but I couldn't find the mating combination. Good puzzle. |
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