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Zdenko Kozul vs Victor Bologan
XXXV Bosnia GM International (2005), Sarajevo BIH, rd 8, May-27
Queen's Indian Defense: Kasparov-Petrosian Variation. Kasparov Attack (E12)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Apr-30-09  Eduardo Leon: The first line I analyzed was 43. ... Rxh3+ 44. gxh3 Qxh3+ 45. Kg1 Qg3+ 46. Kh1 (46. Kf1?? Qf3+ 47. Kg1 Ne2+ 48. Kh1 Qf2+), which is, at least, a draw by repetition. But my judgement of the position told me there had to be a winning continuation for black.

Besides 43. ... Rxh3+, I considered 43. ... Qf2?, with the idea to not allow white's king to escape from the corner. But after 44. e8=Q Rxh3+ 45. gxh3 Nf3?? 46. Qg8#, white mates first, so black only has a draw by repetition: 45. ... Qf3+ 46. Kh2 (not 46. Kg1?? Ne2+) Qf2+.

Since there weren't any moves left, I decided to try 43. ... Rxh3 again: 44. gxh3 Qxh3+ 45. Kg1, and only now I saw the right continuation: 45. ... Qg4+ 46. Kh1 Nf3!, which is possible because the queen controls f5, eliminating the otherwise deadly threat 47. Qf5+ g6 48. Qf7+.

Apr-30-09  Milesdei: Blast! Thought I had it and that the objective was a draw after I rushed in with Qg3+. Qg4+ never occurred to me, because, as Tactical Alertness Panda says, "When a player smells blood, he sometimes forgets that retreat is better than advance. Then he lets his opponent off the hook. And that makes me a saaaad Panda."

(fans of South Park will get this riff)

Apr-30-09  JG27Pyth: Failed solving, failed analyzing, and nearly failed to read the kibitzing before posting my absurd analysis...

Qf5+ must be accounted for, eh?

That sustained wet-flatulent sound you hear is the air being let from my balloon after yesterday's success.

Apr-30-09
Premium Chessgames Member
  kevin86: I missed 45...♕g4+ going for the obvious-and incorrect ♘f3+ or ♘e2+
Apr-30-09  TheChessGuy: This is one of those combinations where the only moves have to be found. Nothing else will do and the degree of risk is Tal-level. That's what makes it so thrilling to play!
Apr-30-09  cydmd: <zooter> and <cheeseplayer>, 43... Ne2 doesn't work because of 44.Qf5+ g6 (44... Kh8 or Kg8 45.e8=Q#) 45.Qf7+ Kh8 46.e8=Q#

If 44.Kh2 is played it follows

44... Rxh3+! 45.gxh3 (forced) Qg3+ 46.Kh1 Qxh3#

Apr-30-09  YouRang: Well, I sort of got it, in a very fuzzy sort of way.

Both sides have a king attack underway, but black gets to go first. It appears that <43...Rxh3+> is the only way to break through, leaving <44.gxh3 Qxh3+ 45.Kg1>.

There should be some mating attack for black with Q+N vs. a cornered king. Unfortunately, my board vision isn't sharp enough to mentally see how to do it.

However, I figure that I would get as far as 45.Kg1 in any case, being assured of at least a draw (by perpetual check). And by the time I got to that position, I might be able to see how to deliver mate. As long as black doesn't allow Qf5+ (which gives white a quick mate), black can play around until a mating line is found (or settle for the draw).

Apr-30-09
Premium Chessgames Member
  gawain: I too missed 45...Qg4+ I saw that f5 had to be protected but did not think of how Black could keep an eye on f5 while pursuing the mating attack. It sounds so simple.
Apr-30-09  Stormbringer: I got the first four moves, but then missed Qg4 and Nf3. Playing t through I had a huh? moment for both of them but Qg4 for instance was so sharp that I think I may have actually learned something (which I believe is the point of the exercise).

Taking my total for the week to ln(√-1)...

Apr-30-09  CHESSTTCAMPS: Referring to my previous post <[snip] White can either try 47.Qh8+ Kxh8 48.e8/Q+ Kh7 1-0 or 47.Qf5+ Qxf5 46.Kg2 Qg5+ 47.Kf2 Qh4+ 48.Kxf3 Qxe7 1-0>

Of course this should read "0-1" in both lines.

Apr-30-09  DarthStapler: I just went for the perpetual
Apr-30-09  PinnedPiece: Got the first few moves, not sure I had 45..Qg4+

Probably been pointed out, but:

46.Kf1 Qf3+ 47.Kg1 Ne2+ 48.Kh2 Qf2+ 49.Kh1 Ng3#


click for larger view

Apr-30-09  CHESSTTCAMPS: <YouRang:> wrote
<... There should be some mating attack for black with Q+N vs. a cornered king. Unfortunately, my board vision isn't sharp enough to mentally see how to do it. ...>

This was a great puzzle for practicing this kind of visualization. I've seen a number of positions involving Q+N versus nearly undefended king. I recall a game Benjamin v. Browne published in Chess Life in which Browne had Q+N in the vicinity of the white king. White had a small pawn shelter for the king and no other pieces nearby, but there was no way for black to win or even force a perpetual check before white's attack broke through.

Apr-30-09  StevieB: For sure a Monday puzzle.
Apr-30-09  parmetd: very simple.
Apr-30-09  YouRang: Hi <CHESSTTCAMPS>

<<YouRang:> wrote <... There should be some mating attack for black with Q+N vs. a cornered king. Unfortunately, my board vision isn't sharp enough to mentally see how to do it. ...>

This was a great puzzle for practicing this kind of visualization. >

Yeah, I could probably see a bit further except that I'm working with a knight. Knights always give my mental board vision fits. They seem to hop around in my head. :-\

Apr-30-09
Premium Chessgames Member
  OBIT: For the folks who doubt they'd find the Qg4/Nf3 idea OTB: I think the main factor here would be your clock situation. Since the perpetuaI is there for the taking and will force a three-fold repetition quickly, you can safely spend most of your remaining time looking for a win. Speaking for myself, I'd probably let my clock run down to about 5 minutes before bailing out with the draw. When my clock gets under 5 minutes, I'm spending more time eyeing my clock than analyzing the position, and when I start doing that, I think it's time to end matters. Of course, when I find the win after the game, I'm kicking myself.

So, would I find this win OTB... Well, I didn't time myself, but I think it took me about 10 minutes, maybe 15, to find the winning idea. If I have at least 30 minutes on my clock, I'm confident I'd find it. Less than 15, this game would have ended a draw.

Apr-30-09  WhiteRook48: found 43...Rxh3+!! 44 gxh3 Qxh3+ 45 Kg1 but I thought Black should play 45...Ne2+?! instead of 45...Qg4+
Apr-30-09  ionnn: If white had played 43 Kh2 instead of 43 Ra1 can't they get the draw ?
Apr-30-09  zb2cr: I found this one. I have nothing to add to the careful explication by <al wazir>, <agb2002>, <TheBish>, and of course <dzechiel>.
May-01-09  RandomVisitor: 37.e7! wins earlier.
May-01-09  5hrsolver: I had a eureka moment looking at this position at work. I was trying to solve the problem before I left for work but couldnt find it. There was the draw by pertual check but is there a win. The black knight and queen had to play a balancing act between attacking and guarding the f5 square from check by the white queen.

It took me more than my usual 5 hrs to solve this one. Just now I was looking at the friday puzzle, it seems like that one I solved quickly. It must be RXN but I have to check further.

May-07-09
Premium Chessgames Member
  patzer2: For the Thursday April 30, 2009 puzzle, Black's demolition with 43...Rxh3+!! puts White into a mating web. The key follow-up in the combination is 45...Qg4+!

On the final move, 46...Nf3 is sufficient but just as good or better is 46...Ne2! . From here, White can only delay mate by giving up decisive material (e.g. 47...Qxf5 48. Kg2 Nh4+ 49. Kg3 g5! ).

Sep-20-11  filipsah: the game can be draw after 39. Qf8+
Sep-20-11  anandrulez: White might be correct in going for the win , but he had a chance to draws 3-4 times atleast .
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