Correct answer: Nb51.Bb5+?? 1...Kb4 2.Bd3#/Be2#/Bf1#/Ba6# 1...Kb3 2.Bd3# but 1...Kd5! 1.Ke3?? (2.Bf7#) but 1...Kd5! 1.Ke2?? (2.B
