Is this position legal?

Arisktotle
RewanDemontay wrote:

Alrighty then! Was it a surprise to see that my solution was one of illegality?

No, because I then already knew it was legal!

RewanDemontay

True.

Arisktotle

RewanDemontay, for your interest I repeat a (rather difficult) puzzle I posted some weeks ago on a different forum. It is interesting for you to see that there can be more than one explanation for a pawn structure and for promotions, leading to a challenging puzzle.

Note there is a convention that you can only play e.p. in a problem if it is legal in all possible proof games. If that is the case, then white can checkmate in 1 move. If not, he can only checkmate in 2 moves.

 

RewanDemontay

I’ll get to it!