I saw this puzzle on gameknot.com recently posted by member, heinzkt-

White to move and mate in 2 moves.
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click to show
The key first move is 1.Rf6 and White will mate next move no matter what Black replies. If, 1...Bxf6 then 2.Nxf6#. Or, if, 1...Qxe4 then 2.Qh8# At first, I kept looking for some violent first move when I tried to solve it. Perhaps, you solved this quickly then congrats!
Link to full game-
Raymond Keene vs John Van Baarle (1980)