Correct answer: Kg11...Kc4/b6 2.Nd6# 1...Nc4 2.a4# 1.Bf3?? zz 1...Kc4/b6 2.Nd6# 1...Nb1/Nc2 2.Be2# 1...Nc4 2.a4# but 1...g2+! 1.Be4?? zz 1.