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Peter Svidler vs Sergey Karjakin
World Chess Championship Candidates (2014), Khanty-Mansiysk RUS, rd 8, Mar-22
Formation: King's Indian Attack (A07)  ·  0-1

ANALYSIS [x]

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Given 6 times; par: 147 [what's this?]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Apr-04-15
Premium Chessgames Member
  DarthStapler: I got the first move and the general idea
Apr-04-15  morfishine: I had <64...Rxd4> 65.Kxd4 but then an immediate <65...g4> (whereas Karjakin played 65...b6)

But thats why he's the Grandmaster

*****

Apr-04-15  arnaud1959: <al wazir> Black doesn't allow 86.c7 by 85.-Qb5, pinning the pawn. Then a series of checks would force the white king to play Kc7.
Apr-04-15
Premium Chessgames Member
  Phony Benoni: <al wazir> That's a very good question. In your line after <85.Kd7>


click for larger view

White will draw if he can get his pawn to the 7th rank with his king guarding c8--so the key is to not let him do so..

Black will win after <85...Qb5!>. Now, White's king is confined to c7, d7 and d6 to protect the pawn, and the only way to allow it to advance is <86.Kd6>. Now Black can bring his king back, since after <86...Ke3 87.c7 Qe8!> he cannot be stopped from playing ...Qc8 when it's all over.

Not easy to find.

Apr-04-15  arnaud1959: <consul> b6 is a key move. Black doesn't gain a tempo to protect the b pawn but gives it on b6 instead of b7 which prevents the white rook from coming to the e-file and then to e1.
Apr-04-15  arnaud1959: ...while black pushes the g pawn.
Apr-04-15
Premium Chessgames Member
  agb2002: Black has an extra pawn. The bishops are opposite-colored.

White threatens 65... Rxd7 to reach a drawing endgame.

The white bishop controls the promotion square g1. This suggests 64... Rxd4:

A) 65.Kxd4 g4

A.1) 66.Rxb7 g3 67.c5 g2 68.c6 g1=Q+ wins.

A.2) 66.Rh7 g3 67.Rh1 g2

A.2.a) 68.Rg1 Be4 69.b4 Bf3 70.a4 Kg3 71.Ke3 g5 and the plan g4-Kh2-g3, to gain control of g1, looks winning.

A.2.b) 68.Re1 Kf3, followed by Kf2 seems to win.

B) 65.Rxb7 Rd6 followed by g4-g3, etc.

Apr-04-15  Nick46: <An Englishman: Good Evening: At my computer, the puzzle title reads "White to Play." Anyone else receive this?> My ancient PC (>10yrs old) says black to play, but at this stage of the week it makes absolutely no difference to me who is to play.
Apr-04-15  gofer: The only question is which is better Rxg7 or Rxd4?!

Both look pretty good.

64 ... Rxg7
65 Bxg7 Kf3

and the black king controls all the squares for Pg5 to get become Pg2, but the problem as always is making Pg2 promote when we don't control g1 and also don't have a DSB any more.

So I think we avoid this scenario and go for the very interesting option of exchanging down to a R+3P v B+4P endgame. The only real point being that Kd4 (which iw where Kc3 will be) has no chance to get come to the rook's aid to stop Pg5!

<64 ... Rxd4!>
<65 Kxd4 g4>

The race is on! So white must prevent promotion and so has no time to pick up Pb7.

66 Rxb7 g3

<66 Re7 g3> (66 Rh7 seems worse as it loses a tempo)

<67 Re1 g2>


click for larger view

At this point there are lots of options for white, but I think there are really only three possible ways forward...

Option 1: Try to bolster the rook's defence of g1, which simply doesn't work!

68 Kc3 Kg3!
69 Kd2 Kh2

and the exchange is forced!


click for larger view

Option 2: Give up Re1 for Pg2 and hope to promote one of its pawns...

68 b4 Kf3
69 a4 Kf2
70 Ra1 g1=Q
71 Rxg1 Kxg1


click for larger view

Option 3: Give up Re1 for Pg2 and attack Pb7 with the king

68 Kc5 Kf3
69 Kb6 Kf2
70 Rd1 Be4
71 b4 g1=Q
72 Rxg1 Kxg1


click for larger view

~~~

<morfishine>: I too liked the immediate pawn push.

Errr???? <66 ... b6?!?!?!> Surely this is unnecessary!!! What do the engines say about this??!! I can see anything wrong with the immediate pawn push.

Apr-04-15  arnaud1959: <gofer :Errr???? <66 ... b6?!?!?!> Surely this is unnecessary!!! > I wrote earlier why b6 was a key move

I don't understand your <66 Rxb7 g3 >?? Why not 67.Re7 g2 68.Re1 ? White sacrifies the rook for the pawn but can you easily prove that the game is won for black?

Just think about the idea of bringing the white King to e5 (f4,g5) and pushing b4,a4,a5,b5 which éliminates the last black pawn on the queen side.

Can the black bishop and King protect the last g pawn and prevent à white pawn from promotion at the same time.

Even if you can do it, you must give us a loooong analysis.

b6 is -at least humanly - very good move.

Apr-04-15  arnaud1959: ....and just keep in mind that black has the wrong bishop to promote the a-pawn. Is it even necessary to get rid of it?
Apr-04-15  chesswar1000: It's not really hard to see that the bishop is the only thing stopping Black's pawns and that removing it would cause definite difficulty for white. I pretty much made Rxd4 my move out of intuition.
Apr-04-15
Premium Chessgames Member
  Fusilli: <gofer> <Errr???? <66 ... b6?!?!?!> Surely this is unnecessary!!! What do the engines say about this??!! I can see anything wrong with the immediate pawn push.>

In your main line there is no need for white to rush his rook to the defense. He has to capture the b7 first, then Re7-Re1. Gets there just in time to stop the g-pawn promotion, and now white has a passer.

Apr-04-15
Premium Chessgames Member
  Penguincw: 64...Rxd4 65.Kxd4 was kinda obvious. However, OTB, I would've played 64...g4.
Apr-04-15  CHESSTTCAMPS: In this rook and bishops of opposite colors ending, black is a pawn up. In this case, the doubled g6 pawn is very valuable, because it screens the g5 pawn from attack from behind, while black's bishop both protects the g6 pawn and hinders the approach of the white king to the king side. Black can eliminate all obstacles to the promotion of the passed g5 pawn with

64... Rxd4! 65.Kxd4 g4 and now:

A) 66.Re7 g3 67.Re1 (67.Re2 Kf3 just gives black a tempo) g2 68.Rd1 Kf3 69.c5 Kf2 70.Rd2+ Kg3 71.Rd1 Kh2 72.b4 (Rd2 Kh1 73.Rd1+ g1=Q 74.Rxg1+ Kxg1 and promotes the other g-pawn) g1=Q 73.Rxg1 Kxg1 74.Ke5 Kf2 75.a4 Ke3 76.b5 a5 77.c6 bc 78.b6 Bc8 79.Kf6 Kd4 and black wins the a-pawn and promotes his a-pawn.

B) 66.Rxb7 g3 67.Re7 g2 68.Re1 g5! (it's critical to advance the 2nd passed g-pawn to make sure the B is not tied to defending it) 69.c5 (Rg1 Kf3 70.Ke5 Bc8 71.b4 g4 72.a4 Kf2 73.Rxg2+ Kxg2 and promotes the g-pawn) g4 70.b4 Kc3 71.a4 Kc2 71.Rc1 g1=Q 72.Rxg1 Kxg1 73.b5 ab 74.ab g3 75.c6 g2 76.b6 Kh2 77.b7 Bxb7 78.Bxb7 g1=Q 79.b8=Q Qg3+ wins

Closer than it should be, I think - time for review...

Apr-04-15
Premium Chessgames Member
  kevin86: Deep, but eventiually black gains a rook for the pawn and the extra bishop can win.
Apr-04-15  CHESSTTCAMPS: Try playing the puzzle position against Crafty, with colors reversed, and test your own line of play:

http://www.chessvideos.tv/endgame-t...

Apr-04-15  devere: 64...Rxd4! 65.Kxd4 b6! is the only win. Either 64...Rxg7 or 65...g4 leads to a draw with best play on both sides.

Precise play by Karjakin, very worthy of a World Championship contender.

Apr-04-15  CHESSTTCAMPS: <devere: 64...Rxd4! 65.Kxd4 b6! is the only win.> Based on my tests against Crafty, that's exactly right. In fact, black can lose with 65...g4 after any more errors.
Apr-04-15  dfcx: The first move is straight forward. 64...Rxd4 65.Kxd4 and white can't stop the pawn promotion. But black has his own problem guarding white's queen side pawn majority. Too deep.
Apr-04-15
Premium Chessgames Member
  al wazir: <Phony Benoni>: Yes, I missed ...Qe8. Thanks.
Apr-05-15  Cheapo by the Dozen: I'm guessing that the exchange sacrifice works, but I won't even try to decide whether I'd play that over the board.
Apr-05-15  Cheapo by the Dozen: Besides what <Morphishine> said, I never would or could have calculated to the point that both sides queen, Black is out of pawns, and Black wins anyway.
Apr-05-15
Premium Chessgames Member
  patzer2: Here's my look at some key moves with Deep Fritz 14:

<25. Bxe6?!> This is where the game turns in Black's favor. Instead, White can keep it level with 25. Nxe6 Nxe6 (Not 25... Bxd5? 26. cxd5 Nxe6 27. dxe6 Rxe6 28. Rc1 ) 26. Rxg6 Bxd5 27. cxd5 Qxd5 = when play might continue 28. Qh5 Rd7 29. Rg4 Rf8 30. Rh4 Qxa2 31. Rg1 Qxb2 32. Qh7+ Kf7 33. Qxf5+ Ke7 34. Bg5+ Nxg5 35. Qxg5+ Ke8 36. e6 Re7 37. Qh5+ Kd8 38. Qd5+ Ke8 39. Qh5+ Kd8 40. Qd5+ Ke8 41. Qh5+ = with a draw by perpetual.

<49...Rxf4> This is not bad, but much stronger and winning quicker is 49... Ke6! when play might continue 50. Rxf5 gxf5 51. Bxc5 Rxd3 52. b4 Ke5 53. Re2+ Kf6 54. Be7+ Kf7 55. Re5 Bg4 56. Kf2 Rxf3+ 57. Ke1 f4 58. Bd8 Rd3 59. Kf1 f3 60. Bh4 Be6 61. Kf2 Bxc4 62. Rf5+ Ke6 63. Rxf3 Rd2+ 64. Ke1 Re2+ 65. Kd1 Rxa2 66. Kc1 b5 67. Bg5 Ra1+ 68. Kd2 d3 69. Rf2 Rb1 70. Kc3 Rb3+ 71. Kd4 Rxb4 (-4.45 @ 20 depth, Deep Fritz 14)

<64...Rxd4!!> Deep Fritz 14 has to wait until 26 depth before it finds this amazing winning move.

<65. Kxd4 b6!> This follow-up is the only way to win, and is probably the reason the computer has such difficulty finding 64...Rxd4!!

<66. Kc3 Ke3!> Cutting off the White King's access here is the only winning move.

< 67. Rb7> White is lost. If 67. Re7+, then play could continue 67...Be4 68. Rf7 g4 69. Rf1 g3 70. Re1+ Kf3 71. Kd2 g2 72. b4 g5 73. c5 bxc5 74. bxc5 Kf2 75. Re2+ Kg3 76. Re1 Bc6 77. Ke3 Kh2 78. Kf2 g4 with mate soon to follow.

<67... g4 68. Rxb6 g3 69. Rd6 g2 70. Rd1 g5 71. b4 Kf2 72. a4 g1=Q 73. Rxg1 Kxg1 74. b5 axb5 75. axb5 g4 76. c5 g3 77. c6 g2 78. b6 Kf2 79. b7 g1=Q 80. b8=Q Qc1+ 81. Kd4 Qe3+ 82. Kc4>

If 82. Kd5, then 82...Be6+ 83. Kd6 Qg3+ .

<82... Be6+ 0-1> Black resigns in lieu of 83. Kb5 Qb3+ .

Apr-02-16  Alexandro: White resigns because king goes to b4 and black plays queen b3 + and takes white`s queen! The end!!!
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