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Jeroen Piket vs Ilya Smirin
"Living Under a Rook" (game of the day Sep-27-2011)
Biel Interzonal (1993), Biel SUI, rd 6, Jul-22
King's Indian Defense: Orthodox Variation. Glek Defense (E94)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Given 22 times; par: 56 [what's this?]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jun-29-08
Premium Chessgames Member
  patzer2: <al wazir> I might amend my remark about 33...Qa2 or 33...Qb3 to indicate the win is now clear and decisive thanks to analysis by <vanytchouck>. See my last post above for details.
Jun-29-08
Premium Chessgames Member
  johnlspouge: Sunday (Insane): White to play and win.

Material: Down N for B+P. The Black Kh7 has 1 legal move, to h8. White has a c-file battery, Rc1 and Rc7, with Rc7 on the same rank as Nd7, Bg7, and Kh7. The Black Nd7 might be embarrassed if it has to retreat. Other than diffuse pressure against the Black position, however, the only immediately obvious strategic theme is a heavy piece invasion. The White Nf3 and Ba3 are relatively inactive. The White Qb5 is threatened by Ba3, requiring an immediate response.

Candidates (31.): Qxd7, Qc6

31.Qxd7 Rxd7 32.Rxd7, threatening

33.Rcc7 34.Rxg7+ winning 2Ns for R.

The threat also includes winning Pe5, so the resulting passed Pe4 would give White the initiative and a winning advantage.

Black can try to counterattack.

32Qb3 [or Qa2] 33.Rcc7 (threatening 34.Rxg7+)

cedes White a winning attack. The heavy pieces Ra1 and Qb3 must now defend Kh7 from a swarm 2Rs+2Ns, which can avail itself of powerful attacking moves like Ne8 and Nh4-Nxg6. Black has no feasible defense, e.g.:

(1) 33Qxa3 34.Rxg7+ Kh8 35.Nh4 then 36.Nxg6#

(2) 33Rg8 34.Ne8

(threatening 35.Nxg7 or 35.Rxg7+ 35.Nh4 36.Nxg6#)

34Bb5 35.Rxg7+ Rxg7 36.Nf6+ Kh8 37.Rc8+ Rg8

38.Rxg8+ Qxg8 39.Nxg8 Kxg8

and White has N for P. Other moves 32 by Qg8 make no difference, because doubled on the 7-th rank, the White Rs can force the Black Q to lose contact with e8 and h4, permitting the variations above.

Black can try to frustrate the White plan of doubling Rs on the 7-th.

32Bc8 [or Rd8] 33.Re7

and the Rs will double. Finally, Black can try to prepare a defense to the doubled Rs and the pin on Bg7.

32Kh8 33.Rcc7

To avoid the original threat (on move 31., losing B+N for R), Black can move Bg7.

(1) 33Bf6 34.Nf7+ Kg7 [or Kh7]

35.N7xe4+ Kh8 [else, drop Qg8 to avoid mate]

36.Nf7+ Kg7 37.N7g5+ Kh8 38.Rh7+ Qxh7+ 39.Rxh7+ Kg8 40.Rxh6

and White is up 2Ns+P for B. A similar maneuver is successful against 33Bf8.

(2) 33Bf8 34.Nf7+ Kg7 [or Kh7] 35.N7xe4+ Kh8

36.Nf7+ Kg7 37.N7g5+ Kh8

38.Bxf8 (threatening 39.Bg7+ 40.Bf6+ 41.Bxg5+ 42.Rh7+ and mate)

38Qxf8 [Rxf8 permits the finish above] 39.Rh7+ Kg8 40.Ne6

threatening 41.Rcg7+ 42.Rh8#, so Black must sacrifice Qf8 for a R.

Jun-29-08
Premium Chessgames Member
  johnlspouge: As someone who relies on calculation (too much, according to some :), the complexity of Sundays' puzzles has sparked my interest in classifying defenses to a threat (here, doubling the Rs on the 7-th). The best I can do on my own is: (1) counterattack (here, Q sortie into the White Q-side), (2) frustrate the threat (here, prevent the Rs from doubling), or (3) prepare a defense to the threat (here, try to get the Bg7 out of the coming pin on the 7-th). Physicians have a similar classification, e.g., trauma, infection, cancer, etc., to aid in diagnosis. With a methodical classification of chess defenses, critical lines should become more difficult to overlook.

Does anyone know of any methodical classification of chess defenses?

Jun-29-08  PinnedPiece: The beauty of the last few moves to me lies in what is probably the bleeding obvious to most visitors here (but not to me):

The bishop is well and truly pinned and there is no escape for the black king. 33..h5 (trying for wiggle room)
34 and 35 sees the knights close in for white and curtains for black (at any rate a lost queen).

.

Jun-29-08
Premium Chessgames Member
  dzechiel: Wow, <JLS>, you need to spend more time with your family!

The analysis you posted is very detailed, it must have taken a LONG time to put together. I'm impressed.

Jun-29-08
Premium Chessgames Member
  DarthStapler: I didn't get it
Jun-29-08  SufferingBruin: I am both grateful and awed by the analysis on this page. To put in the work of JLS and patzer2 would take me... well, a long time.

I didn't get it, either.

Jun-29-08
Premium Chessgames Member
  johnlspouge: <<dzechiel> wrote: [snip] The analysis you posted is very detailed, it must have taken a LONG time to put together. [snip] >

Nowadays, I generally spend about 2.0-2.5 hours on a Sunday puzzle; 1.5-2.0 hours on a Saturday. I do not know if that is "LONG", but it is less than 6 months ago by a factor of about 2-3. Today, I had little doubt about the key move, which helps a lot. After that, I just grind out variations, often as fast as I can type (hence, my interest in a methodical way of listing the defenses). I do not use a board, and I now have myself trained to visualize and remember critical positions in the middle of variations, which speeds the process enormously. I do not have access to a computer today, so I cannot check my variations, but I believe I caught most of the tactical themes.

Of course, unlike my analyses, <your> analyses are actually useful for learning chess; I enjoy them, so thanks.

Jun-29-08  234: Could someone tell the starting move of yesterday's puzzle, Saturday, Jun-28-08 P Popovic vs M Lazic, 1993 ? Thanks in advance!
Jun-29-08  Jesspatrick: This is a great game if you like to play the white side of the King's Indian.

A common script for stuffing a King's Indian is to rip open one or two queenside files, grab one, and invade with the heavy pieces. This game is a good case in point. If you know this script, then you know to look for sacs like this.

Jun-29-08
Premium Chessgames Member
  zenpharaohs: johnlspouge: "Nowadays, I generally spend about 2.0-2.5 hours on a Sunday puzzle; 1.5-2.0 hours on a Saturday. I do not know if that is "LONG", but it is less than 6 months ago by a factor of about 2-3."

I normally spend about 20 minutes trying to solve the hard problems. Once I get my "solution" then I usually start computing to check my solution and the problem, and this can take longer, but the computer is doing the work then.

Jun-29-08
Premium Chessgames Member
  Marmot PFL: I looked at this for about 30 seconds to see where the queen should go, and then it occured to me that if Qxd7 Rxd7 Rxd7 followed by Rc1-c7 black is in real trouble. His bishop is pinned to the king and the queen as usual is a poor defender. Both white knights are very threatening. I didn't calculate many lines because I couldn't even find a credible defense for black, unlike the better analysts here.
Jun-29-08
Premium Chessgames Member
  johnlspouge: <<zenpharaohs> wrote: [snip] I normally spend about 20 minutes trying to solve the hard problems. >

Yeah, I figured as usual, I was working too hard :>)

Jun-30-08
Premium Chessgames Member
  Once: You are all making me feel very lazy! I try to keep it as realistic as possible, so I only allow myself as much time as I would take in a normal game.

So 20 minutes is about the most I would spend on the first pass - and I usually try to figure it out in ten or less. Most of the positions are late middlegames when 10 or 20 minutes is probably all that you could afford without running into time problems.

If a position is interesting (especially if I got it wrong or did not see all of the key variations) then I will spend longer, including analysing with Fritz.

Jun-30-08  ravel5184: <234> White to play. 22. ?

-An Admirer

Jun-30-08
Premium Chessgames Member
  kevin86: A surprize queen sac on Sunday-looks like a Monday idea.lol
Jun-30-08  234: Wow, I have an admirer! Thanks for that compliment. By the way, you are (almost) the first one ever who gives feedback to me or User: 012 for doing these puzzle postings. Maybe the reason is that premium members don't need these because they have anyway access to the old puzzles. So, here is now an unique possibility to a free 3-month trial premium membership: http://www.chessgames.com/perl/surv... I already have my own with my main account.

So, the question and the answer combined: Saturday puzzle Jun-28-08 <22. ?> P Popovic vs M Lazic, 1993

Jun-30-08  ravel5184: <234> By the way, what are you going to do when you get up to 890?
Jun-30-08  234: User: ravel5184 , that's the question I have thought all these months ... but I'll answer after you have said <hello!> from me to User: KnightFork82
Jul-18-08  Helloween: <LaFreak>34.Bb2 1-0
Sep-27-11  sevenseaman: A massed attack after the surprise but obligatory Q sac. A worthy GOTD today. The latter stage intricate work is a pleasure to follow.
Sep-27-11
Premium Chessgames Member
  kevin86: With the rooks attacking it is bad enough-but the knight really means that the clergy will go...
Sep-27-11  scholes: I seem to understand what white is doing after queen sac. He is bringing his forces to attack the king. But Black's play is puzzling
Sep-27-11
Premium Chessgames Member
  Marmot PFL: I guess I examined this as a puzzle 3 years ago, then completely forgot ever seeing it. The better players though almost always have excellent chess memory. How else could they play several blindfold games simultaneously? A player of Fischer or Kasparov caliber might see this game once and never forget it.
Sep-27-11  scormus: A fun game to play over, and and a nicely conducted campain by W.

I'm pleased I wasnt looking at it as the Sunday POTD of 3 years. Very nice finish but I'd have had a hard time finding the Q sac.

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