Standard chess rules apply, the board is not rotated (i.e. white pawns move upwards), no lateral thinking is needed. Simply find the one move for white which mates the black king.
This puzzle was created by Leonid Kubbel.
@boboquack found the only solution. The following list shows suggestions from comments and other answers together with their refutation. You can click each link to show an image/animation.
bishop d6 point blank boom what do you say
What about moving the bishop from g3 to h4.
Seems like a winner to me.
Knight to G6, right?
No capture No escape for King in any direction.
White queen at e3 takes black queen at e5
This should mate the king
Edit: did not see that a bishop could block this. This is not a mate.
Knight, D4 to F5. I think this meets the criteria.
I have a solution that can be given in just nine characters, but Stack Exchange demands that an answer be at least 30 characters long. So now that I've satisfied that restriction:
d7xc8 = N
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