Amazing difficult study mate in 3

This is the hardest Study (mate in 3) that I ever tried to solve.. After checking twice all possible white moves.. I give up.

Samuel Loyd (January 30, 1841 – April 10, 1911) born in Philadelphia and raised in New York, was an American chess player, chess composer, puzzle author, and recreational mathematician.

If You don't know this famous Study try to solve without Engine :-)