[Retros] Problem a friend of mine and I created years ago

[Paulo Peccin]

Hello,

I am new to this list.

I would like to contribute a chess problem invented by me, Paulo Peccin,
and my friend Klaus Wuestefeld.
We created this problem many years ago, when I we did not even know there
was a category of problems called Retrograde.

It's a "Mate in 2" problem. White to play.
The board position is in the attached image file.

I would like you guys to comment on this, and please let me know if you
find the solution (with proof)!

Regards,
Paulo
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