Correct answer: Nc61.Nd2+?? 1...Kb4 2.Nd3#/Qa5# but 1...Kc2! 1.Nc5+?? 1...Kb4 2.Qa5# but 1...Kc2! 1.Qa2+?? 1...Kb4 2.Nd3#/Nc6# b
