Agferna: Agferna: Actually I got it wrong – so I owe you all a more complete analysis. At move 51 black has two choices to attempt a win 1) go after the g-pawn, 2) go after the h-pawn. Taimanov’s clever 45. h5! move has put these pawns far enough from each other that that black king cannot sweep them both together. So the first method is played out in the game and just doesn’t work. The white king is quick to the black pawns and the black king cannot both eat the white pawns and defend his own pawns. So method 2.) seems clean and straight-forward. Either immediately or after a couple of fronting moves the black king makes a quick dash for the h-pawn: 51...Ke5 52. Kc4 Kf5 53. Kd5 Kg5 54. Ke6 Kxh5 55. Kf5! (Kf7? loses to Kh6 and the black king can support the black pawns up the board) arriving at this position:
click for larger viewwith the white king optimally placed limiting the mobility of the black king. Pawn moves don’t work, allowing Kg6 doesn’t work, so black can only play Kh6. White plays g4!, again leaving his king optimally placed and forcing black’s king to Kh7. Then g5! forces the pawn trade and black ends up one pawn up in a theoretical drawn position.
click for larger viewWas there a winning line for black? Instead of 43… f6? let's try 43...Ra4 44. Kd3 (has to act quickly - no time for h4 and h5 - for if black's king get's to d6 the game is over) Kf8 45. Kc3 Ke7 46. Kb3 Ra7 47. Rxa2 Rxa2 48. Kxa2 Kd6 49. Kb3 Kxd5 not that different from the game except white's pawns are closer to each other and black's pawn is on f7. Note that this position is winning for black even with the white pawn on h5 if the black pawn is on f7, denying the white king the Kf5 drawing resource
click for larger viewNow White has to choose between 1.) defending his pawns or 2.) attacking the black pawns.
1) Defend: 50. Kc3 Ke4 51. Kd2 Kf4 52. Ke2 Kg3 53. Kf1 f5! 54. Kg1 f4 55. Kh1 Kf2! 56. Kh2 f3 57. gxf3 Kxf3 58. h4 Kg4 59. h5 Kxh5 60. Kh3 Kg5 61. Kg3 g6 winning for black.
click for larger view2) Attack: 50. Kb4 Kd4! 51. h4! g6!
click for larger view2.1) 52. Kb5 Ke3 53. Kc5 f5! (not Kf2? g4!) 54. Kd5 Kf2 55. Ke5 Kxg2 2.1.1) 56. Kf6 f4 57. Kxg6 f3 58. h5 f2 59. h6 f1=Q 60. h7 Qf8 and comes up one tempo short of drawing for white.
click for larger view2.1.2) 56. Kf4!? Kh3 57. Kg5 f4! 58. Kxf4 Kxh4 59. Kf3 g5 wins.
click for larger view2.2) 52. g4 Ke4 53. h5 gxh5 54. gxh5 Kf5 55. Kc5 Kg5 56. Kd6 Kxh5 also wins for black.
click for larger viewSo there you have it, 43 ….Ra4! led to wining variations. Would have been a third legendary giant Soviet scalp under Cuellar's belt, but Geller and Korchnoi is plenty!
Cheers All. | 
Kibitzing
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