50. Kc4 looks winning easily? Rf4 and Kc5.
If instead Rb3, promotes, and the white king stops the pawn.
I accepted a draw in a winning position?
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50. Kc4 is simply lethal, with the idea Bb4 covering the b-file.
50...Rb3 51. Bb4; 50...Rf4+ 51. Kb5 Rb1 52. Kxa4 Ra1+ 53. Kb5 Rb1+ 54. Bb4; even 50...a3 51. Bxa3 (of course just b8=Q is good) wins quickly.
A pity to have drawn this, it's an easy pattern. I might look at the rest of the game in more detail in the next few days.
In the last round of my first tournament, I lost the exchange pretty early in the game (I got B+P for a R). I had to give it up since I would get mated otherwise. I continued to fight on for a draw. I managed to reach an endgame, which even though I was down material my opponent didn't play very well and let me reach a winning position, with a passed pawn far advanced. I accepted a draw since I wasn't 100% sure of the win (I didn't have much time on the clock and I knew a slight inaccuracy might prove fatal so I accepted the repetition).