Some unexpected turn of events...

This shows how even when all seems lost, there is always some way to turn the game in your favor.

Now, what's wrong with 2. ... Kxc6?

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Sorry for that one, there was a mistake on the diagram, I have corrected it.

That was cool.

And bitterly unfortunate for white.  ;)

6.Bc1+ and white is up a bishop

CPawn tiene razón. ¿Se puede evitar esta situación con 5. ... Kf6 6. Bc6 Rb8 7. Rb1 Rb6?

...

Creo que no; seguiría 8. Bc1 bxc1=Q+ 9. Rxc1, y las blancas conservan su alfil de ventaja.

It looks to me as if white should win with careful play.  I think pushing the a-pawn too soon is a mistake.