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Bogdan Lalic vs Yaroslav Zherebukh
28th Cappelle-la-Grande (2012), Cappelle la Grande FRA, rd 7, Mar-08
Queen's Gambit Declined: Cambridge Springs Variation (D52)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Aug-02-15
Premium Chessgames Member
  Penguincw: Oops! Wrong exchange sac (31.Rxb7).

At least it's Monday tomorrow!

Aug-02-15
Premium Chessgames Member
  An Englishman: Good Evening: Had a feeling that White's 31st constituted the solution, but never would have seen all of the variations and never would have played this in real life.
Aug-02-15  nalinw: I had 31. Rxe6 but followed that up by

31. .... Qxe6
32. Nf4

planning Rxb7 and getting 3 pieces for 2 rooks - seemed a good plan but actually losing material when you count points!!

The lesson today is to keep track of all unguarded pieces on the opposing side - Qc5 is something I should have seen.

Aug-02-15  jith1207: I think it would have been more insane to start from White's 28th move. But I guess Chessgames wanted all to find the theme starting with 31st move. Even though the pinning seemed to win over the exchange, the clever use of opponent's unguarded pieces to annoy each and every piece out of the board clinched the game easily in the end. Black's plan of moving supported pawns in a and b file fizzled out as it started. May be, that's where black went out of any plan completely and its pieces were uncoordinated all over the place.
Aug-02-15  diagonalley: well... the first move kinda suggested itself... and i got a couple of the succeeding moves but in the wrong order(!)... still it is sodding sunday so that's actually not bad :-)
Aug-02-15  morfishine: Which exchange first? 31.Rxb7 or 31.Rxe6? <31.Rxb7> looks better since 21.Rxe6 can be answered with 31...Qxg6 spoiling White's fun

31.Rxb7 Rxb7 32.Rxe6 Qxe6 33.Nf4 Qe8 34.Nxd5 Rxd5 35.Qc5 winning a piece

Wow, White did initiate with 31.Rxe6; really good game and final sequence of moves

I guess Black got “Bogged Down” defending <c6>

*****

Aug-02-15  wooden nickel: Looks like responding with 33.Bc7! immediately would lead to a similiar win as played a couple of moves later... so is by playing 33.Rb6 first somehow an improvement or maybe just to gain time in case of zeitnot? There are a couple of inferior alternatives that don't look bad either i.e. 33.Qe7 or 33.Ne7.
Aug-02-15  Abdel Irada: Apparently Black knew his Nimzovich *too* well, and followed the "passed pawn's lust to expand" dictum too early.

In any case, the undefended rook on a7 that this plan led to became a real Achilles' heel in his position.

To see how great a weakness this is, look at the "other" defense to the key move: 31. ...Qxg6?!

This is met by the same killer quiet move that came up in the main line: 32. Qc5!, and Black can't hold the rook, the bishop and the pinned knight.

Seems to me that if we read our chess classics a bit further, we'll also see some mention of uncoordinated pieces inviting combinations. :-D

Aug-02-15  Tiggler: Completely missed this one because I thought that Bxb7, to be followed by Bxd5, was good. But it's not. Hopeless in fact.
Aug-02-15  mel gibson: This game is too complicated for me.
Aug-02-15
Premium Chessgames Member
  patzer2: Here's my look at the game with Deep Fritz 14x64:

<1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. e3 Qa5 7. cxd5 Nxd5 8. Rc1 Bb4 9. a3 Bxc3+ 10. bxc3 h6 11. Bh4 Qxa3 12. Qd2 e5 13. Bd3 exd4 14. exd4 O-O 15. O-O b5 16. Rfe1 a5 17. Bb1 Bb7 18. c4 bxc4 19. Rxc4 Rfe8 20. Ne5 Nf8 21. h3 a4 22. Rec1 Qd6 23. Bg3 Qe6 24. Qb2 Qe7 25. Ba2 Ne6 26. Kh2 Red8 27. Rb1 Ra7 28. Rxc6!> Up until now it's been a well played but quiet positional game with even chances for both sides.

However, the brilliant sacrifice offer 28. Rxc6! upsets the apple cart. According to Fritz, correct play leads to equality. But Black quickly gets lost in the complications, and after one not-so-obvious error gives White a brilliant won game.

<28..a3 29. Qc1 f6?> This is Black's decisive mistake. Instead, Fritz indicates Black can hold with 29...h5 =, 29...Qe8 = or 29...Nxd4 =.

I like the active choice 29... Nxd4 30. Bxd5 Rxd5 31. Rc7 Qg5 = when play might continue 32. Qe1 (32. Bf4 Ne2 33. Bxg5 Nxc1 34. Be3 a2 35. Rbxc1 a1=Q 36. Rxa1 Rxa1 37. Rxb7 Rxe5 38. Bd4 Rea5 39. Bxa1 Rxa1 40. g4 Ra3 41. Rb8+ Kh7 42. Kg2 g5 43. Rb7 Kg7 44. Rd7 Ra2 45. Kg3 =) 32... Rxe5! 33. Qxe5 a2 34. Ra1 Nb3 35. Qe8+ Kh7 36. Rxa2 Qd5 37. Rxb7 Rxb7 38. Ra8 Nc5 39. Ra5 Qe4 40. Qc8 Ne6 41. Re5 Qb1 = (+0.03 @ 23 depth).

<30. Ng6!> (+4.76 @ 22 depth) With this move, White is now clearly winning. Another winning option is 30. Rbb6! (+4.37 @ 22 depth).

<30..Qe8 31. Rxe6!> This follow-up to the decisive 30. Ng6! solves today's Sunday puzzle.

Another difficult winning option is 31. Rd6! Rxd6 32. Bxd6 Kh7 33. Rxb7 Rxb7 34. Bxd5 when play might continue 34...Rb6 35. Bxe6 Rxd6 36. Bf5 Rd5 37. Ne5+ Kh8 38. Nf7+ Kg8 (38... Qxf7 39. Qc8+ Qg8 40. Qxg8+ Kxg8 41. Be6+ ) 39. Qc4 Qb5 (39... Qxf7 40. Qc8+ Qf8 41. Be6+ Kh7 42. Qxf8 ) 40. Qc8+ Kxf7 41. Qc7+ Kg8 42. Be6+ Kh7 43. Qc2+ f5 44. Qc8 Kg6 45. Qg8! Rd6 46. Bf7+ Kf6 47. Qf8! Qb6 48. Be8+ Kg5 49. Qe7+ Rf6 50. f4+ Kxf4 51. Qe5+ Kg5 52. Qg3#.

<31... Qxe6 32. Qc5 Qa6>

If 32... Raa8, then White wins with 33. Rxb7 .

<33. Rb6 > (+3.98 @ 22 depth) This is clearly decisive, but Fritz indicates there's another strong winning alternative available here.

Fritz's preference is 33. Bc7! when play might continue 33...Re8 (33... Rd7 34. Rb6 Qd3 35. Rxb7 Rxb7 36. Bxd5+ Rxd5 37. Qxd5+ Kh7 38. Ne7 Qb3 39. Qf5+ Kh8 40. Qc8+ Kh7 41. d5 ) 34. Rxb7 Qxb7 (34... Rxb7 35. Qxd5+ ) 35. Bxd5+ Qxd5 36. Qxd5+ Kh7 37. Qc5 Raa8 38. Ba5 a2 39. Nf8+ Rxf8 40. Qc2+ Kh8 41. Qxa2 Ra7 42. Qd5 Rfa8 43. Bb6 (+8.25 @ 22 depth, Deep Fritz 14).

<33... Qa5 34. Rb5 Qa6 35. Bc7 Raa8>

If 35...Re8, White wins with 36. Ra5 .

<36. Bxd8 Rxd8 37. Ne7+ Kh8 38. Ra5 Qe2 39. Bxd5 Bxd5 40. Nxd5 Qxf2 41. Rxa3 Qf5 42. Ne7 Qe4 43. d5 1-0>

Black resigns as he's down decisive material with no hope of swindling a draw.

However, if Black wishes to push it, one possible continuation is 43... Qe5+ 44. Rg3 Qb8 45. Nf5 Qe5 46. Qa7 Rg8 47. Ne7 (+15.32 @ 20 depth).

P.S.: My failed solution was 31. Rxb7? which favors black after 31...Rxb6 32. Bd6 Qxg6 33. Bxd5 Qf5! 34. Bc4 Kh8 35. Qe3 Ng5 36. Bxa3 Qe4 (-0.38 @ 22 depth).

Aug-02-15
Premium Chessgames Member
  patzer2: <AI> After 31...Qxg6, your 32. Qc5! is certainly winning.

However, also strong here is 31...Qxg6 32. Re7! pinning and winning a piece.

Aug-02-15
Premium Chessgames Member
  patzer2: <Morfishine> After 31.Rxb7 Rxb7 32.Rxe6 Qxe6 33.Nf4, Fritz finds 33...Qf7! (-1.15 @ 25 depth).

P.S.: The tempting 31. Rxb7 (missing 31. Rxe6!) was my failed Sunday try.

Aug-02-15
Premium Chessgames Member
  whiteshark: Argh missed <35.Bc7> which not only attacks ♖d8 but also obstructs the 7th rank for ♖a7. I wanted Ne7+xd5 too soon, which moreover didn't work then due to ... a2.
Aug-02-15  Abdel Irada: <However, also strong here is 31...Qxg6 32. Re7! pinning and winning a piece.>

Agreed, although I think it is perhaps slightly more effective to probe first and reserve the rook move.

But since both win, maybe this is really just a matter of personal preference.

Aug-02-15  Abdel Irada: I often find myself wanting to analyze <chrisowen>'s solutions and see whether they break new ground, but sadly I don't speak spam with sufficient fluency.

Perhaps one of our resident programmers can develop translation software? :-D

Aug-02-15
Premium Chessgames Member
  patzer2: <whiteshark> That you got the first four moves of this difficult sunday is impressive.

Good point about 35. Bc7! According to Fritz, it's the only winning option and it's five moves deep into White's combination after 31. Rxe6!

It's six moves deep if you consider 30. Ng6! (following 29...f6?) the initial winning move in White's combination.

P.S.: I suppose the line you describe is 35. Ne7+ Kh8 36. Nxd5 Bxd5 37. Bxd5 a2 38. Bxa2 Qxa2 =.

Aug-02-15  morfishine: <patzer2> Thanks for looking, tough to figure these out visually. You admit to "missing" 31.Re6; I admit looking at both, but then choosing the wrong move :)

*****

Aug-02-15
Premium Chessgames Member
  patzer2: <chrisowen>'s original analysis after 33. Bc7 with 33...Kh7 34. Bxd8 Kxg6 35. Rb3 Kh7 36. Bb1+ Kg8 actually poses an interesting problem (diagram below),


click for larger view

where the correct solution is Chris's 37. Bd3! as play continues in his line with 37...Qa4 38. Rxb7! Rxb7 39. Qxd5+ (+7.12 @ 23 depth, Deep Fritz 14).

Aug-02-15
Premium Chessgames Member
  patzer2: <morfishine> Thanks!
Aug-02-15  wooden nickel: <chrisowen>'s Scottish vernacular is hard to understand but he sure has a brilliant chess comprehension!
Aug-02-15  john barleycorn: <wooden nickel: <chrisowen>'s Scottish vernacular is hard to understand but he sure has a brilliant chess comprehension!>

Yup, my impression, too.

Aug-02-15
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop and a knight.

Black threatens 31... Bxc6, 31... Qxc6, 31... Qxg6 and 31... Nxd4.

These threats and the pinned knights invite to play 31.Rxe6

A) 31... Qxe6 32.Qc5 (32.Nf4 Nxf4 (32... Qf7 33.Qc5) 33.Bxe6+ Nxe6 and Black seems to hold; 32.Rxb7 Rxb7 33.Nf4 Qf7 and Black can protect d5 with three pieces) and the double threat Qxa7 and Ne7+ seems to win material. For example, 32... Rda8 33.Rxb7 Rxb7 34.Bxd5 Qf7 35.Bxf7+ Rxf7 (35... Kxf7 36.Qd5+) 36.Ne7+ Kh8 (36... Rxe7 37.Qd5+) 37.Qd5 Rff8 38.Ng6+ Kh7 39.Nxf8+, etc.

B) 31... Qxg6 32.Rxb7 Rxb7 33.Bxd5 (33.Re8+ Rxe8 34.Bxd5+ Rf7) 33... Rxd5 34.Qc8+ Kh7 (34... Kf7 35.Qe8#) 35.Qxb7

B.1) 35... a2 36.Ra6 (36.Qxd5 a1=Q 37.Re8 Qxe8) and White seems to emerge a bishop ahead.

B.2) 35... Ra5 36.Ra6 Qf5 (36... Rxa6 37.Qxa6 and 37... Qd3 is not possible) 37.Qa7 Rxa6 38.Qxa6 + - the a-pawn falls and White ends up a bishop ahead at least.

B.3) 35... Qf5 36.Ra5 wins the a-pawn.

Aug-02-15  dfcx: White to move.
White's c file rook is under attack. Then there is the white LSB lining up with black knights and king, as well as the threat of Ne7+.

There are at least two choices. Rxb7 and Rxe6. After 31. Rxb7 Rxb7 white lacks good followups.

31.Rxe6 Qxe6 32.Qc5!

Now it's more interesting. White is attacking the rook and threatening Rxb7 is black moves the rook away.

If black moves the queen away Ne7+ wins the second knight.

A) 32...Qa6 defends both the rook and bishop. 33.Ne7+ Kh8 34.Nxd5 wins two pieces for a rook.

B) 32...Rda1 33.Rxb7 Rxb7 34.Bxd5 wins the queen.

C) 32...Ra6/Raa8 33.Rxb7

I do not see how else black can defend.

Aug-02-15  BOSTER: Somtimes very active behavior can spoil all game. Black gueen made 14 moves , white only 4. Other pieces want to play too.
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