Very hard mate in 1

Its white to move and mate in 1 move. Take ur time and try to solve it . ( Dont write solution in the coments , just say if u got it or not ) :)

I can find mate in 2 but not 1.

There is no mate in 1, h8 is a flight square and Qf6+ allows Kxh6

The computer says checkmate in two moves.

It's en passant. dxe6

I believe the OP is cheating. Let's just say that not all the correct flags (hint: en passant) are set in his position setup in the study, which is why the engine doesn't find it :)

EDIT: Ah, well, I guess we're just disregarding the OP's request not to post the answer? :)

The mate in one is in the captcha. We got trolled.

By chess problemist convention, en passant is illegal unless stated otherwise (or can be proven to be legal via retrograde analysis).

But you're only allowed to capture e.p. if you can prove the last move has to have allowed it.

@a_pleasant_illusion I agree
From wikipedia
Castling and en passant conventions

In retrograde analysis problems, as well as in standard chess problems, castling is assumed to be legal unless it can be proved otherwise. An en passant capture, on the other hand, is permitted only if it can be proved that the last move was a double step of the pawn to be captured. These two conventions lead to features unique to retrograde analysis problems.