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 "Unknown449"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/3k4/1p4r1/p2pP3/P1PPp1pb/1K2P3/3B4/6R1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ A classic Entrapment tactic. } 1... Bf2 2. Rg2 ( { White can try: } 2. Rb1 { This move is more active, but does nothing to slow the g-pawn's promotion. } 2... g3 3. cxd5 g2 4. e6+ Kd6 5. Kc4 g1=Q 6. Rxb6+ Ke7 7. Rb7+ Kf8 8. Rb8+ Kg7 9. e7 Qf1+ 10. Kc5 Bg3 11. e8=Q Bd6+ 12. Kc6 Bxb8+ 13. d6 Qc4+ 14. Kb7 Bxd6 15. Bxa5 Qd5+ 16. Ka6 Re6 17. Qc8 Bc7+ 18. Ka7 Qxa5+ 19. Kb7 Qa6+ 20. Kxc7 Qb6+ 21. Kd7 Qd6# ) 2... g3 { White's rook is now entrapped. } 3. cxd5 Rh6 4. d6 Rh2 5. Rxg3 Bxg3 { Black wins with a large material advantage. } 0-1