Don't Mate in One
Karl Fabel (born October 20, 1905 – 3 March 1975) is considered to have been one of the most ingenious chess composers. He was born in Hamburg, Germany. Fabel received a doctorate in chemistry and worked as a mathematician and civil judge.
Don't Mate in One
~Source : My Best Mathematical and Logical Puzzles
You are asked to find a move for white that will NOT result in an immediate checkmate of the black king.
THERE IS ONE AND ONLY ONE MOVE WHICH DOSEN'T LEAD TO MATE IN 1
SEE IF YOU GOT IT 
