Won a simple game

I was playing black.



1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 h6 5. Nc3 Nf6 6. h3 O-O 7. O-O d6 8. Nd5 Be6 9. b3 a6 10. a4 Na5 11. Ba3 Ba7 12. b4 Nxc4 13. dxc4 Nxd5 14. cxd5 Bd7 15. b5 axb5 16. a5 Qc8 17. Qd3 b6 18. c4 bxc4 19. Qxc4 bxa5 20. Bxd6 cxd6 21. Qxc8 Rfxc8 22. Rxa5 Bxf2+ {white forfeits by disconnection} 0-1

White's move 20. Bxd6 was a blunder