black can just move out of check?
he doesn't need to move the bishop... no threats?

Why doesn't White take the Rook with the pawn on move 3?

After white plays 3.cxd8=8, Bxd8 the R v B endgame is a draw.

At the end position if the king moves to the F file then Rf5+ forking the king and bishop, and if the king moves to the d file then Rd5+ forks the rook and king winning (if Bxe5 then cxd8=Q wins).

Great move!! White wins. 

Great puzzle, thanks. Who is the author?

i can't remember if you want i can find it out for a couple of days.

Adamperfection, in this case R vs B it can't be won. That's the important thing that amiraz said, i suppouse.