Correct answer: Kb71...Bc3 2.Nb3#/B:c3# 1...Bd4 2.B:d4#/Nb3# 1...Be5 2.B:e5#/Nb3# 1...Bf6 2.B:f6#/Nb3# 1...Bg7 2.B:g7#/Nb3# 1...B