White will be thinking it's a loss but if you look at Game 11777545
you will see it has been classed as a Draw.
You as Black were doing OK. But...
You played 19...NxB here. That Knight was very good e5.
You make a drastic oversight later on in this game (see next)
but that is oversight and can happen to anyone. This move 19...NxB
is worse because you meant it and it is possibly based on the rumour
that Bishop are worth more Knights.
In this position that e5 Knight is worth more than a Rook.
Here with Black to play.
Black 31...BxQ+ and that would probably has been 0-1.
White returned the compliment here. (White to play)
White chopped Queens but 36.Ne5+ wins the Queen or Mates Black.
36.Ne5+ Kf5 (only move) 37.Qf6+ Ke4 38.Qf4 mate.
The ending is won for White but they slipped up.
59.b5 cxb5 is a draw which you demonstrated.
59.Kd6 or 59.a5 (or any other legal move apart from 59. b5) wins.