[Retros] First example of 'reverse mate' theme

[Nicolas.Dupont at math.univ-lille1.fr]

> I've found one setting with a promoted piece, all my other attempts

> failed at either not being able to prove the last move was the double

> pawn-step, or white had other moves.


Can you give it to us ? (or at least on my private mail address if you
wish to publish it elsewhere).

Nicolas.