The blunders are all there on the board, waiting to be made.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown199"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/8/1p6/r4Rp1/4KPP1/7k/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rxf4 2. Kxf4 b4 3. Ke3 ( { White can try: } 3. fxg4 b3 4. g5 b2 5. g6 b1=Q 6. Kg5 Kxg3 7. g7 Qh7 8. Kf6 Qg8 9. Kg6 Kg4 10. Kf6 Kh5 11. Kf5 Qxg7 { Black wins with a large material advantage. } ) 3... b3 4. Kd3 gxf3 5. g4 f2 6. Ke2 Kg2 7. g5 f1=Q+ { Black wins with a large material advantage. } 0-1