White is to move and checkmates in 2 moves.
I remember years ago when I played scholastic chess, we were a group of youngsters around a board with this problem on it,
after we had been there trying to solve for a while the strongest of us jokingly made the correct move, but he didn't mean so he put it back again, I however was a little more alert than the rest of us, and suggested it as the correct move.
Now let us see if you can solve this.