Correct answer: d41...Kd4 2.Qd6# 1...Rd4 2.Nb6# 1.Nb6+?? 1...Kd4 2.Nf3#/Qd6# but 1...B:b6! 1.d4! (2.Qc5#) 1...K:d4 2.Qd6# 1...Rc1
