long forcing continuation

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regicidal1977

Quite proud of this long forcing continuation. Analysis found zero blunders, mistakes or inaccuracies which is very rare for me. Can't seem to attach the pgn as a graphic via my phone.. [Event "jobbistoke vs. regicidal1977"] [Site " Chess.com"] [Date "Oct 6, 2016"] [White "jobbistoke"] [Black "regicidal1977"] [Result "0-1"] [WhiteElo "1692"] [BlackElo "1672"] [TimeControl "1 in 0 day"] [Termination "regicidal1977 won by checkmate"] 1. e4 g6 2. d4 Bg7 3. e5 d6 4. Nf3 dxe5 5. Nxe5 Bxe5 6. dxe5 Qxd1+ 7. Kxd1 Nc6 8. f4 Bg4+ 9. Be2 O-O-O 10. Ke1 Bxe2 11. Kxe2 Nd4+ 12. Kf2 Nxc2 13. Na3 Nxa1 14. b3 Nh6 15. Bb2 Rd2+ 16. Kf3 Nxb3 17. Bc3 Rxa2 18. e6 f6 19. Bb4 Nf5 20. Rb1 Nbd4+ 21. Ke4 Re2+ 22. Kd3 Re3+ 23. Kd2 Rd8 24. Kc1 Nb3+ 25. Kb2 a5 26. Bc3 a4 27. Nc4 Re2+ 28. Ka3 b5 29. Na5 Nxa5 30. Bxa5 Rd3+ 31. Kb4 Nd6 32. Rc1 Re4+ 33. Kc5 Rdd4 34. g3 Rc4+ 35. Rxc4 Rxc4+ 36. Kd5 c6# 0-1

Martin_Stahl
blueemu

I must be blind... why doesn't 24. ... a5 win a piece?

xman720

I don't get it, why can't the bishop just move away? Or even take the pawn?

I mean, I understand that white is crushed and black is going to win the bishop no matter where it moves simply because of white's king position. But I don't understand why a5 is a tactic that wins the bishop. It seems like just one winning move out of all the other winning move.

EDIT: Oh I see, it's because of Rc3+. I didn't see that idea, I just looked at the knight check followups.