Can you find a mate in one move?

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MaestroDelAjedrez2025
How can black mate white immediately?
I can assure you that it's not easy to solve this puzzle.
HINT:
There's only one move that's mate.
Congratulations if you can solve it  

kire137
This is the same puzzle but in interactive format. It's a bit hard to see when the board is static, like above. This should help.
HACKER_PRO_1979
Ummmmm…
nocturnal808

this was about as hard as a satsuma

SacrifycedStoat
Regardless of what direction the pawns are going, I don’t see any mate in 1 for black
SacrifycedStoat
Ah nvm
MaestroDelAjedrez2025

I know how insanely difficult it is to mate in one move. But, it's not impossible!

at1kshs1ngh

There is no mate in 1 there is only 1 check rxa7 and that's not checkmate

at1kshs1ngh

at1kshs1ngh

Stock fish also can't see mate

MaestroDelAjedrez2025

In this position, it's not possible to mate in one move.

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at1kshs1ngh

Exactly

MaestroDelAjedrez2025

There was a mate in one move for black in the position I originally set up for this topic

Ziggy_Junior

castle I think?

MaestroDelAjedrez2025

Yes. Black has to castle if he wants to checkmate white!