Correct answer: Nd11...Rb3 2.K:b3# 1...Rb2+ 2.K:b2# 1...Qd3+ 2.e:d3# 1...Qd2+ 2.K:d2# 1...Qd1+ 2.K:d1# 1...Qc5 2.Kc1#/Kc3#/Kd2#/Kd1# 1...