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Karl Burger vs Pavao Keglevic
corr (1977) (correspondence)
Catalan Opening: General (E00)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Apr-18-08  YouRang: Really, this puzzle was all about making a simple threat (Qg7#), and finding resourceful ways to interfere with black's attempts to defend against it.

First with 30.Re5! (threatening Qf6 & mate-to-follow by blocking the black queens diagonal access to f6).

And later, with the "quiet" 32.c5!!, threatening to block the queen's defense of f6 on the 6th rank. Black is strangely helpless to do anything about it.

Apr-18-08
Premium Chessgames Member
  kevin86: I missed it! White's main goal was to get to the long diagonal with the queen and it was black's mission to stop him. Black game is so thin that even a threat of blocking the queen from f6 was enough to pull the sheet over his head.
Apr-18-08
Premium Chessgames Member
  pittpanther: As the game went, can't white play 32. Bxf7! If black plays Kxf7 it is mate in two, Rxf7 meets Re8 followed by Qe7 and mate and Kh8 is met by Re6 and Queen check on either e5 or f6. Or am I missing something?
Apr-18-08  sombreronegro: It looks like weak black squares on the kingside for black to me. If 28 h6 there is no time for b4 x c3. 29 Qe5 threatens mate and pins the pawn on c3 to the queen to boot. f7 cannot move to block because of the pin. Given whites's control of the efile most of the real estate of the a1 h8 diagonal will be purchased by white
Apr-18-08  YouRang: <pittpanther: As the game went, can't white play 32. Bxf7! If black plays Kxf7 it is mate in two, Rxf7 meets Re8 followed by Qe7 and mate and Kh8 is met by Re6 and Queen check on either e5 or f6. Or am I missing something?>

Your line may win also, but not so strong. After 32...Rxf7 33.Re8+ Rf8 34.Qe7, giving black an opportunity to strike back, starting with 34...Be4+, to which white must reply 35.Qxe4. The mating attack stalls after 35...Qxh6, and the win isn't so clear.

Apr-18-08  Magic Castle: < Jimfromprovidence > There is some flaw in your analysis. The theme of white's attack is to mate at g2. It appears that you are banking at the threat of Rf2+ ones the pawn captures white bishop, but then the white King goes to Kg2 after Qc1+ and black loses tempo. The threat is Qe5 and mate next move. So the rook will have to be sacrificed to prolong the torture.
Apr-18-08  Magic Castle: <Jimfromprovidence:> In yesterday puzzle wherein you amended your post. Still the picture did not change. There are no forced continuations for white. For example, what is black going to do to the reply Re1. The black queen cannot move to defend the e6 pawn because the Knight is in peril.
Apr-18-08
Premium Chessgames Member
  al wazir: I think white would have won faster with 27. g5, followed by h6. Then there's no need to move the ♕ to e5 in order to threaten mate on g7; she's already there.
Apr-18-08
Premium Chessgames Member
  Jimfromprovidence: <Magic Castle> <There is some flaw in your analysis. The theme of white's attack is to mate at g2. It appears that you are banking at the threat of Rf2+ ones the pawn captures white bishop, but then the white King goes to Kg2 after Qc1+ and black loses tempo. The threat is Qe5 and mate next move.>

I think you are right. The move to Kg2 instead of Kh2 wins for white.

That must be why <Random Visitor> did not post it.

Apr-18-08
Premium Chessgames Member
  Jimfromprovidence: <Magic Castle> <In yesterday puzzle wherein you amended your post. Still the picture did not change. There are no forced continuations for white. For example, what is black going to do to the reply Re1. The black queen cannot move to defend the e6 pawn because the Knight is in peril.>

I'll respond to your comment under yesterday's game, below.

V Zvjaginsev vs Y Vovk, 2008

Apr-18-08  fenno: After finding 28. Qe5 (with the idea of 29. h6) I thought it wins enough material and did not seek any longer.
Apr-18-08  YouRang: <al wazir: I think white would have won faster with 27. g5, followed by h6. Then there's no need to move the to e5 in order to threaten mate on g7; she's already there.>

Then, after h6, doesn't that leave black with the defense of ...Rg6?

Apr-18-08  YouRang: <fenno: After finding 28. Qe5 (with the idea of 29. h6) I thought it wins enough material and did not seek any longer.>

No good, I'm afraid. Black merely has to retract his bishop, and then h6 is guarded by the black rook.

Apr-18-08  JG27Pyth: <JohnLspouge: Any suggestions on a method or criterion to move 28.h6 up my candidates list would be welcome.>

That's an interesting task... sort of a question for a computer chess programmer trying to fine tune his engine.

h6 is a very non-intuitive move IMO. I certainly don't have a method for moving it up the decision tree... I'm impressed h6 was played, I think the fact that it's correspondence chess had a lot to do with it... its a very accomplished tactician who spots this move with a clock ticking in his ear... to push a pawn rather than capture a piece... and ordinarily this kind of pawn thrust is being hurled at the castled position in order to open it up rather than lock it down. h6 is an 'exception to the rule' sort of move, exactly the sort of thing that makes a good puzzle.

<Today was particularly tough, because the other candidates <almost> work.> Ah There's today's advantage ... I'm too stupid to make those other lines _almost_ work... they all failed miserably for me, good thing I didn't spot the resources you did or I'd have never found h6 ;)

About using the dark-squares to find h6... ahem... well, it goes like this:

My actual decision making process made generous use of the ultra-BS "it's a puzzle" decision tree! ... I looked at the position and thought, "It's a puzzle but I can't see one sac that looks productive... I sorta want to take the bishop but if the pawn takes the bishop what kind of puzzle solution would that be?. ah... but if the pawn _doesn't_ take and instead pushes... now that would make me sit up in my chair and say, hoo-boy what a puzzler of a move... let's see if it works... hey hey it works!!! ...you know now that I think about it, it occurs to me black is weak on the dark squares... If I'd seen that earlier it might have helped me solve this puzzle in a less utterly non-chess BS way.. ah well, it always sounds smart when people talk that "weak on the dark squares" stuff, better mention it in my post about this puzzle..."

So there's my method... BS + Self-aggrandizement. Oddly enough, I'm not seeking elected office.

Apr-18-08  Dr. J: <Jimfromprovidence, Magic Castle> In your amended line 28... Qc1+, 29 Kg2 Re6, 30 Bxe6 fxe6 you seem to see a clear win for White, but I can't find it. Please help me out. A clear win is required to justify 28 h6, because in the initial position White has 28 Ne4 followed by hxg6, retaining B+N for P+R, and positional advantage too.
Apr-18-08
Premium Chessgames Member
  johnlspouge: <<JG27Pyth> wrote:h6 is a very non-intuitive move IMO. I certainly don't have a method for moving it up the decision tree...>

I found 28.h6 very unintuitive, too, so thanks for the reassurance. <dzechiel> also had trouble, so the move is clearly anathema to "method".

To promote 28.h6 in the decision tree, perhaps <"the harmony of tactics and strategy"> (my phrase) can help. <UdayanOwen> first suggested it to me as a criterion for halting calculations. To paraphrase him, if you win at least a P and <the resulting position furthers your strategic aims>, calculation can stop.

Today's position had as its strategic theme the weak dark-squares around the Black Kg8. There were tactical features as well (the pins), but they turned out to be secondary to the strategic theme. Of my first three candidates, 28.Bxf7+, 28.hxg6, and 28.h6, only 26.h6 directly addressed the dominant <strategic> feature. The rote rule of "checks, captures, and threats" takes care of tactics, but sometimes more is required...

<So there's my method... BS + Self-aggrandizement. Oddly enough, I'm not seeking elected office.>

"BS + Self-aggrandizement" are obviously necessary but not sufficient conditions for seeking office. For not foisting your flaws daily upon us, I thank you really, truly, and sincerely ;>)

Apr-18-08
Premium Chessgames Member
  patzer2: I suppose 28...Kh8 is answered by 29. Qe5+ f6 30. Qe7 with a double mate threat. Here, the reply 30...Rg8 is easily countered with 31. Bxg8 .
Apr-18-08
Premium Chessgames Member
  al wazir: <YouRang: <al wazir: I think white would have won faster with 27. g5, followed by h6.>

Then, after h6, doesn't that leave black with the defense of ...Rg6?>

27. g5 bxc3 (unless you have a better move for black) 28. h6 Rg6 29. Rf3 Qa3 30. Rxf7 Rxf7 31. Qe8+ Qf8 32. Bxf7+. Maybe it isn't faster, but it is a win.

Also winning is 30. c5. If 30...Qxc5, then 31. Rxf7 Rxf7 (31...Qxd5 32. Rxf8+ Kxf8 33. Qxd5) 32. Bxf7+ Kxdf7 33. Qxc5.

Apr-18-08
Premium Chessgames Member
  Jimfromprovidence: <Dr J>. <In your amended line 28... Qc1+, 29 Kg2 Re6, 30 Bxe6 fxe6 you seem to see a clear win for White, but I can't find it. Please help me out. A clear win is required to justify 28 h6, because in the initial position White has 28 Ne4 followed by hxg6, retaining B+N for P+R, and positional advantage too.>

It’s because of where white king’s locates after 28…Qc1+, a subtle but crucial difference. Black has a devious threat after 28... Qc1+, 29 Kh2 Re6, 30 Bxe6 fxe6 that he cannot play after 28... Qc1+, <29 Kg2> Re6, 30 Bxe6 fxe6, below.


click for larger view

He wants to play …Rxf2+, which he cannot now do now that white’s king is on g2 and not h2. If the king were on h2, white would have had to play Ne4 to prevent Rxf2+. This knight move allows black’s queen to play Qb2 in order to access the a1-h8 diagonal, enabling the queen to assist in the defense of his king.

Now, after 28... Qc1+, 29 Kg2 Re6, 30 Bxe6 fxe6, white continues with 31 Qe7 and black is now out of luck.


click for larger view

He cannot play Rxf2+ and his queen cannot access that long diagonal.

Apr-18-08  YouRang: <Dr. J: <Jimfromprovidence, Magic Castle> In your amended line 28... Qc1+, 29 Kg2 Re6, 30 Bxe6 fxe6 you seem to see a clear win for White, but I can't find it. Please help me out....>

I think you have the line wrong. Black would not play 29...Re6?? as 30.Bxf6 fxe6 31.Qe7 win easily (e.g. 31...Rf7 32.Qe8+ Rf8 33.Qxe6+ Rf7 34.Nd5 Qb2 <what else?> 35.Nd7+ Kf8 36.Nxg6+ hxg6 37.Qe8#).

Black could try 29...bxc3, but then 30.Qe5 <threat:Qg7#> Be4+ <a clearance sac to expose h6> 31.Bxe4 Rxh6 <ending the Qg7# threat, but now...> 32.Qg5+ Rg6 33.Bxg6 hxg6 34.Qf6 <making threat at h8 and unpinning the rook> Qd1 35.Rh3 <threat:Q or R to h8#> Qxg4+ <futile delay> 36.Kh2 <winning>.

Apr-18-08  YouRang: <al wazir: <YouRang: <al wazir: I think white would have won faster with 27. g5, followed by h6.> Then, after h6, doesn't that leave black with the defense of ...Rg6?>

27. g5 bxc3 (unless you have a better move for black) 28. h6 Rg6 29. Rf3 Qa3 30. Rxf7 Rxf7 31. Qe8+ Qf8 32. Bxf7+. Maybe it isn't faster, but it is a win. ...>

It looks like 29...Qc1+ spoils that plan: 30.Kh2 Rxh6+ 31.gxh6 Qxh6+.

However, my computer found 29.Qe7 <an improvement over 29.Rf3, threatening 30.Qxf7+! Rxf7 31.Re8#> Qc1 30.Kh2 <and black has little choice but> 30...Qxe3 31.Qxe3 <leaving white with a better game.>

Apr-18-08  wals: Static Evaluation: White has a Knight for a Rook.
The e file is wide open for white.

Dynamic Evaluation. Bg6 guards an otherwise open King. White's Knight is threatened. Removal of the rook on d6 and the bishop on g6 should faciliate an attack on the black King.

Abstract Assessment: Rook moves to e6 attacking d6 and g6. f x e6 opens up the f file for a possible checkmate, so that's out.

As well there is no check of the King by Bd5 as Rook would take Bxe6. Bd5-e4 would give g6 being attacked 3 times and defended three times- no advantage there. f5xg6 if taken by hxg6, Qh6,g6-g7 and not so clear cut. hxg6, Rxg6 less so. Bxf7+, Kh8, Bxg6, Qxf2+, that's a no-goer.
N-e4, attacking one of the defenders of g6, Rf-e8 Ne4xd6, Rxr, QxR. Candidate move, Ne4
28.Ne4 ...Re8 29.Nxd6 ...Rxe3 ..30.Qxe3 , my best shot

PM=

My calculation was shot down in flames by the simple 28. ...h6 I'll leave it all in, warts and all, for future reference

Analysis by Fritz 11: Time 5min.

1. (1.27): 28.h5-h6 Qb2-c1+ 29.Kg1-h2 Rd6-e6 30.Bd5xe6 f7xe6 31.Nc3-e4 Qc1-b2 32.Kh2-g2 Kg8-h8 33.Ne4-d2 Qb2-d4 34.Qg5-e7 Qd4-f6 35.Re3xe6 Qf6xf2+ 36.Kg2-h3 Rf8-f7 37.Qe7xb4 Rf7-f4

2. (0.46): 28.c4-c5 h7-h6 29.Qg5-e5 Rd6-e6 30.Bd5xe6 f7xe6 31.Nc3-e2 Qb2xe5 32.Re3xe5 Bg6-c2 33.Ne2-d4 Bc2-d1 34.Re5-e4 Rf8-f6 35.Kg1-g2 e6-e5 36.Re4xe5 Bd1xg4 37.Re5-e7

(, 19.04.2008)

Apr-18-08  234: Thursday puzzle <30. ?> Apr-17-08 V Zvjaginsev vs Y Vovk, 2008
Apr-18-08  NguyenVo: I thought h6 was a very intuitive move. Apart from his queen, Black doesn't have any piece that can guard the dark squares (particularly g7). The two rooks and the light bishop are essentially useless in this situation. All white has to do was making sure the black queen cannot get to those dark squares.
Apr-18-08
Premium Chessgames Member
  DarthStapler: Didn't get it
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