[Retros] trying to find a #0,5 retroproblem

[raosorio at fibertel.com.ar]

Hi,

I'm trying to find a problem that I remember from some 6 years ago, stip #0,5,
 where the idea was  that the retro demonstrates a black rook should be on b8 
(otherway black had not last move). 

But, since white is in the process to capture that rook (half move) then the rook is not
on the diagram. The 0,5# move is then Bh2-b8 (completing the capture on b8) delivering
mate by a h1 wR discovered check (black king is on h8).

May somebody help me?

best,
Roberto