Correct answer: Ke21.Ke2! (2.Nf3#/Nf7#/Ng4#/Ng6#/Nd3#/Nd7#/Nc4#/Nc6#) 1...Bf7 2.N:f7# 1...Bh5+ 2.Nf3#/Ng4# 1...Bd7 2.N:d7#
