The black knight

Checkmate in Moves

The black knight on f8 is the last powerful defender of its regent. He is able to defend many attack variants bravely, but in the end, as always, there is a fine little move that leaves him powerless. Can you find the key move this spring and mate it in two moves? Good luck!
Manual
Move for White with the best possible moves and achieve checkmate before the countdown expires. Black responds automatically and tries to prevent the checkmate.
Chesspuzzle: 181

Solution moves

Chess composer
Comins Mansfield
The Problemist, 1956
Statistics
Fails: 18 // Checkmate: 2