Antonio Torrecillas wrote:

White can obtain a pawn ending with 36.Bd4 Bxd4 37.Kxd4 Kd7

I examined 37 ... b6?! I can't see Black drawing unless White makes a
mistake. It would be close... one wrong move, and Black has a draw.

Line A: 36. Bd4 Bxd4 37. Kxd4 b6 38. cxb6+ Kxb6 39. Kc4 f6 40. gxf5
exf5

On the queenside, White has a clear passed pawn, which both kings are
focused on. On the kingside, Black has a pawn majority. White's king
must leave his queenside pawn to stop black's kingside pawns. Black's
best shot to draw is controlling e6/f6/g6.

41. Kd5 Kxb5 42. Ke5 f4 43. Kf5 Kc5 44. Kxg5 f3 45. Kf4 Kd5 46. Kxf3
Ke5 47. Kg4 1-0

Black loses by only one tempo! Against a lesser opponent, there are
drawing chances.

Lines B: 39. ... Kc7 40. Kc5 f5 41. b6+! Kb7 42. Kd6 Kxb6 43. Kxe6 fxg4
44. Kf5 Kc5 45. Kxg4 1-0

Line C: 39. ... Kc7! 40. Kc5 f5 41. f3? f4 42. Kd4 Kb6 43. Kc4 Kb7 44.
Kd4 Kb6 45. Kc4 Kb7 46. Kc3 Kb6 47. Kb4 e5 48. Kc4 e4 49. fxe4 f3 50.
Kd3 Kxb5 51. Ke3 Kc4 52. Kxf3 53. Kxf3 Kd4 54. e5 Kxe5 55. Ke3 1/2 -
1/2

Kc7 is an attempt to play Line A one move ahead. However, White will
still win with 41. b6+. 41. f3? is a mistake. At 1-5s per move, Rybka
chooses b6+. At 6-10s per move, it chooses f3. At 10+ seconds per move,
it chooses b6+. Again, there are real drawing chances here against a
lesser opponent.