A beautiful chess problem, not an easy one, you have to know all the rules of the game to solve it.
The solution can't be found here, bacuse I've submitted it to the server and don't want to help here for solving it.
The task is: white mates in one!
One sure thing: it does have solution!
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Dmitriy Ivanovich Mendeleev (1834-1907) is best known for devising the Periodic Table of Chemical Elements.
He loved to play chess, among other games, and correspondence chess too. A beautiful but hard chess problem follows from him from July 4, 1889, white mates in two: