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Alder Escobar Forero vs Dieter Nederveld
Seville op 30th (2005), rd 6, Jan-12
Caro-Kann Defense: Gurgenidze Counterattack (B15)  ·  1-0
ANALYSIS [x]

FEN COPIED

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sac: 22.Bb2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Mar-11-15
Premium Chessgames Member
  morfishine: <Once> Nice post on <22.Rxe6>; I only considered 22...Qxa1+ in response
Mar-11-15  Shadout Mapes: Yup I missed the knight move 24...Ne5 in the lines given by <Once> and <Pi Guy>, thanks.

<morfishine> 22.Rxe6 Qxa1+?? 23.Bf1 Qxa3 24.Re7+ Kf8 25.Qxa3 looks pretty bad for black.

Mar-11-15
Premium Chessgames Member
  CHESSTTCAMPS: White has the bishop pair for N+B, but the real advantage is a big lead in development, marked by the fact that 3 black pieces are still on their home squares, with rooks disconnected. The black queen guards e6, essential to the king's survival in the middle. Therefore, she should be diverted.

22.Bb2!! skewers the queen and rook, leaving no good options.

A) 22... Qxb2 23.Qxe6+ Ke8 (Kg7 24.Qg6+ Kf8 25.Re8#) 24.Qe8+ Kg7 25.Re7+ (or Qxg6+ etc) Kf6 26.Qf7#

B) 22... e5 23.Qxd5+ (any) 24.Qxa8 wins a rook.

C) 22... Qf4 23.Qxf4 gxf4 24.Bxh8 wins a rook.

D) 22... d4 23.Bxd4 e5 24.Qd5+ Kg7 25.Rxe5! Nxe5 26.Bxe5 1-0

Time for review...

Mar-11-15
Premium Chessgames Member
  CHESSTTCAMPS: <agb2002>
E) 22... Qf4 23.Qxe6+ Kf8 24.Qe8#.

Good point!

Mar-11-15  diagonalley: yep... 22.B-N2 (as soon as one sees that 22....P-K4 loses a rook). dare i start thinking about a hat-trick?!
Mar-11-15  TheaN: Wednesday 11 March 2015 <22.?>

White has the bishop pair for bishop and knight. The bishops are already doing quite a good job cutting off the black king, so it suggests white continues this ranged king hunt. Initially I was looking at 22.Rxe6? Qxa1+ , then at 22.Bg6+ Qxg6 (Kxg6 23.Rxe6 ) 23.Qe7+ Kg8 24.Rxe6, but found that the combination was difficult to finish after 24....Qf7.

Both these ideas are part of the solution, albeit slightly more passive. White instead wins with <24.Bb2!>. The key of this move is that it takes out the queen as crucial defender around the black king. Accepting the sacrifice shows this:

A) <24....Qxb2/Qf4 25.Qxe6+ Kf8 (Kg7 26.Qg6+) 26.Qe8+ Kg7 27.Qg6+ Kf8 28.Re8# 1-0>.

B) <24....Qd8 25.Qxe6+ Kf8 26.Ba3+ Nc5 (Qe7 27.Bxe7+ Ke8 (Kg7 28.Qg6#) 28.Bg6#) 27.Bxc5+ Qd6 28.Bxd6+ Kg7 29.Qg6# 1-0>.

C) <24....Qe7> displays the power of the bishops beautifully <25.Bg6+! Kf8 (Kxg6 26.Qxe7 ) 26.Bg7+! Kxg7 27.Qxe7+ Kxg6 28.Rxe6+ > and mate soon.

D) <24....d4 25.Bxd4> did not help black.

E) <24....e5> perhaps the most practical defense, because interposing on the diagonal temporarily halts white to gain control over the diagonal. However, this left the defense of d5. <25.Qxd5+ Kg7 26.Qxa8 >.

Mar-11-15
Premium Chessgames Member
  whiteshark: <22.Bb2!> deflects the strongest defender. The ♔ is left under almost bare poles.
Mar-11-15  Bycotron: 22. White to play, his goal is to deflect the black Queen from defending key squares around her King. Two candidate moves quickly present themselves, 22.Bg6+ and 22.Bb2. The second of these appears to lead to an overwhelming advantage for White (it's mate if black accepts the Bishop!).
Mar-11-15
Premium Chessgames Member
  doubledrooks: Spent time trying to make 22.Bg6+ work, but didn't see much after 22...Kg8. Then I looked wider and found 22.Bb2
Mar-11-15  dfcx: 22.Bb2 deflecting the queen. Black has to give up the rook, otherwise

22.Bb2 Qxb2
23.Qxe6+ Kf8 24.Qe8+ Kg7 25.Qg6+ Kf8 26.Re8#

Mar-11-15
Premium Chessgames Member
  gawain: This one has surprising complexities. My try would have been 22 Bg6+. I never considered Bb2 at all.
Mar-11-15
Premium Chessgames Member
  kevin86: I saw this one right away! White mates quickly as black's queen is lured away.
Mar-11-15  ASchultz: ...b5 looks ridiculous but apparently Black's real problem was ...Bxe5, because Qg4! is just too strong. Fritz dropped the hammer on that, though the position's uncomfortable in any case.

I also found b3 far cleverer than I probably should've. It even sets up the final tactic.

Mar-11-15
Premium Chessgames Member
  Jimfromprovidence: I went with 22 Qc6!?


click for larger view

The line is long but forced; 22...Nb6 23 Bc5 Bd7 24 Qd6 e5 25 Qxe5 Qxe5 26 Rxe5.


click for larger view

White is up a pawn, has an excellent position and is specifically looking at 27 Re7+.

Mar-11-15
Premium Chessgames Member
  AvidChessMan: I looked at 22.Bb2 briefly, but thought there was no way the black queen would take the bishop. I should have been more focused on her need to guard the e6 pawn and how 22.Bb2 denies her that square.
Mar-11-15  Marmot PFL: The theme this week seems to be punishing kings that are either unwilling or unable to get out of the center. This isn't always easy.

I wasted a lot of time looking at 22 Bg6+ Qxg6 (Kxg6 23 Rxe6) 23 Qe7+ Kg8 24 Rxe6 Qg7 and not fining anything decisive.

Diverting the queen with 22 Bb2 looks much better - 22...Qe7 (Qxb2 23 Qxe6+ Kg7 24 Qg6+ Kf8 25 Re8#) 23 Bg6+ Kf8 24 Bg7+ and wins the queen.

Mar-11-15
Premium Chessgames Member
  fm avari viraf: I think, there are many alluring moves like 22.Rxe6, Bg6+ but 22.Bb2 would definitely bring the curtains down as Black has no adequate defence.
Mar-11-15  Edeltalent: 22.? White to play

A nightmare position for Black. White is fully developed with active, well coordinated pieces, has a completely sound structure, a safe king and pressure all over the place with the bishop pair on an open board. Pretty much the opposite can be said for Black. No wonder that White's pieces are ready to feast on one of the many weak squares around the airy black king.

My first intuition was 22.Bg6+ with the idea to deflect Black's queen from e7, but there's no continuation from there. 22.Rxe6 also is too complicated. If the Re1 moves up the board, it's generally annoying that a1 is hanging.

Thus the idea 22.Bb2 entered my mind (a move which didn't occur to me spontaneously, because the battery towards e7 seemed so juicy), which wins without much ado. The bishop can't be taken because 22...Qxb2 23.Qxe6+ Kf8 24.Qe8+ Kg7 25.Qg6+ Kf8 26.Re8# is mate, but 22...e5 23.Qxd5+ drops one rook and 22...Qe7 23.Qxe7+ the other one.

Mar-11-15
Premium Chessgames Member
  Penguincw: I can't be the only one who thought about 22.Bg6+ Qxg6 23.Qf7+ Kg8 24.Rxe6.
Mar-11-15
Premium Chessgames Member
  Longview: I first considered Rxe6 but then realized it would be a better later move if I could jostle the group. That made the move Bg6+ attractive. Either the Kxg6 or Qxg6 reply. If Kxg6 then Rxe6 pins/wins the queen. If Qxg6 then Qe7+ is possible forcing the King to separate from the Queen followed by Rxe6 challenging the Queen. When she moves off the g-file then the square she is guarding, e8 becomes open to check the King.

Do I have it?....No it was the other bishop sac! OMG. I just looked at Houdini and it tells me I just made a winning position go even! The replete the challenge of the black queen is met by Q-g7. Got to explore more possibles. I saw the skewer but not the moves that followed the Qxb2.

Mar-11-15  starry2013: Of course I saw Bb2 but I thought the Q could just take. Turns out the computer only played its pawns in the way and then I can move Qd5 check and capture the rook and so game over.
Mar-11-15  ajile: 22.Bg6+ might be winning but it will be a long hard road with accurate play to do it.


click for larger view

Analysis by Rybka 3 32-bit : 19 ply

1. (0.71): 22...Qxg6 23.Qe7+ Kg8 24.Rxe6 Qg7 25.Rae1 Nf8 26.Qxg7+ Kxg7 27.Re8


click for larger view

Ne6 28.Bb2+ d4 29.R1xe6 Bxe6 30.Bxd4+ Kf7 31.Rxh8 Rxh8 32.Bxh8 Bf5


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White is 2 pawns up but opposite colored bishops.


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Analysis by Rybka 3 32-bit : 22 ply

1. (0.79): 33.c4 a5 34.Bc3 Bc2 35.c5 a4 36.bxa4 Bxa4 37.f3 Ke6 38.Kf2 Kd5 39.Bg7 h5 40.Bf8 g4 41.f4 Ke4 42.g3 Bd7 43.Bd6 Bf5 44.Be7


click for larger view

Analysis by Rybka 3 32-bit : 23 ply

1. (1.03): 44...Kd5 45.Ke3 Ke6 46.Bf8 Kd5 47.Bd6 Be4 48.Be7 Bg6 49.Kd2

2. (1.14): 44...Bd7 45.Ke2 Kd5 46.Kd3 Ke6 47.Bd6 Kd5 48.Kc3 Bf5 49.Kb4 Bd3 50.Be5 Bf1 51.Bc7 Bd3 52.Bd6

Mar-11-15  ajile:


click for larger view

Analysis by Rybka 3 32-bit : 26 ply

1. (1.58): 54.Ka4 Bf5 55.Kb4 Be6 56.Bf8

2. (1.56): 54.Bf8 Bf5 55.Kb4 Be6 56.Bd6

Mar-11-15
Premium Chessgames Member
  Bubo bubo: Since Black's LSB is not yet developed, the black rooks are disconnected. White exploits this weakness with 22.Bb2!

Black must not capture because of mate after 22...Qxb2 23.Qxe6+ Kf8 24.Qe8+ Kg7 25.Qg6+ Kf8 26.Re8# (or 23...Kg7 24.Qg6+ Kf8 25.Re8#).

Hence Black will lose either Ra8 (after 22...e5 23.Qxd5+) or Rh8 (when he retreats with his queen; note that 22...Qd8 fails to 23.Qxe6+ Kf8 24.Ba3+).

Mar-11-15  PJs Studio: I was deeply distracted by Bg6+ and just didn't think it was worth it. Then I saw Bb2(!) but, I couldn't see how to proceed if black plays d5.

Which means I get an F! (maybe an F+ but still, failing.)

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