Opposite color bishop endgame fail

The example is straightforward: white has two free pawns on the c and the h file. As these are so far apart black cannot defend. The a pawns and the black pawns do not matter.

For achieving draw in an opposite colored bishops endgame with two pawns down can only be achieved if you build a fortress so that the pawn of the opposite side gets captured if it tries to move. See this link for knowing more about this:
http://chess.stackexchange.com/questions/12229/how-do-you-draw-in-an-opposite-color-bishops-endgame-with-two-pawns-down

In your game, you could not successfully build a fortress to stop black pawns from moving forward as a result, a white pawn was able to get promoted.

@saksham If he had played 58 Bc2 intending 59 Bd1 he could IMHO still hold the draw. The King together with the Bishop guard the two pawns, while the Bishop also defends the own pawn. The two pawns are too close to each other, contrary to the example.

@tpr After 58. Bc2, black may play Kd2, thereby preventing Bd1 by white. The game will proceed like
58. Bc2 Kd2
59. Be4 a2
60. Kxe2 c2
61. Bxc2 Kxc2
which is lost for white.
Or the game may proceed like
58. Bc2 Kd2
59. Bb4 a2
60. Kxa2 c2
61. Bxc2 Kxc2
again lost for white.

PatzerGareBear13

It seems to me the move 42.g4 is not very good. Take a look
42.Kd3 Be5 43.Kg4 Kg6 44.f4 Bxf4 45.Kxc3 h5 46.Kd4 h4 47.Be8+ Kf6 48.Bd7 Bh6 49.Kd5

Thanks for that continuation @Leon53! I assumed you meant Kc4 instead of 43. Kg4. That is another blockade, but mostly on the kingside!

@tpr and @saksham yes I know that 58. Kxb4 was horrible. But from that point, it was still a loss anyway. I had to play better before that move. Thanks for the continuation and link!

PatzerGareBear13
#16
I mean the following: if the black king goes to the queenside - the white king also to to the queenside (help the elephant). But as soon as it comes to "a" pawn, the white elephant clings to the pawn "f5" :)
Because of this, the black king can not go far from the pawn f5!

Yes good point!