More drama from the USA Championship: Kaidanov blunders

[Javier]

Whilst GM Stripunky's 11 moves first round loss against Onischuck is still fresh in our minds, today it was GM Kaidanov´s turn to blunder in a very favourable endgame. Here's the position after white's 49th move:

 

 

[site "Saint Louis USA"]

[Date "2012.05.15"]

[Round "7"]

[White "Ramirez, Alej"]

[black "Kaidanov, G."]

[Result "1-0"]

[ECO "D43"]

[WhiteElo "2593"]

[blackElo "2594"]

[Annotator "I.M. Javier Gil"]

[EventDate "2012.05.08"]

 

 

 

 

49...Re3

 

(49... Ke5 {This looks more logical.} 50. a5 Rb7 51. Bc4 Ke4 52. a6 Rg7 {Javier: And white has to worry

about not losing his g pawn but also about d3. He's lost.})

 

50. Bc4 Ke5 51. a5 Ke4?

 

(51... Rc3 52. a6 Rc2+ 53. Kf3 Rb2 54. g4 d3 55. g5 Kd4 56. g6 d2 57.

Be2 Rxb3+ 58. Kf4 Rb8 59. g7 Rg8 60. a7 c4 {White's pawns look dangerous, but

so are black's ones!} 61. Bf3 c3 62. a8=Q Rxa8 63. Bxa8 d1=Q 64. g8=Q) (51...

Kf4 52. a6 Re7 53. g3+ Ke4 54. Ke2 Rg7 55. Kd2 Rxg3 56. a7 Rg2+ 57. Be2 Rg8 58.

Bb5! {And black has nothing better than Rg2+, with a draw.}) (51... Kd6!?)

 

52. a6

 

 

52... Rc3??

 

(52... d3 {This was mandatory, but white's got the better chances now.} 53. Bd5+ Kd4 54. a7 d2 55. a8=Q d1=Q 56. Qa4+ Kc3 (56... Kd3 $4 57. Bc4+ Kd2 58. Qd7+) (56... Kxd5 $4 57. Qd7+) 57. Kxe3 Qd3+ 58. Kf4 Qxd5)

 

53.a7 {White's winning now.}

 

53... Rc2+ 54. Be2 Ra2 55. a8=Q+! Rxa8 56. Bf3+ Kd3 57.Bxa8 Kc2 58. g4 Kxb3 59. g5 c4 60. g6 d3 61. g7 d2 62. Bf3 c3 63. g8=Q+ Kb2 64.Bd1 1-0