Correct answer: Qg11...f3 2.Nf1#/Nc4# 1.Kb1?? zz 1...f3 2.Nf1#/Nc4# but 1...d3! 1.Kb3?? zz 1...f3 2.Nf1#/Nc4# but 1...d3! 1.Ka2?? zz 1...f3 2.Nf1#
