Correct answer: Qa11...f5 2.K:c2# 1...Nd4 2.Nc4# 1...Ne1 2.Kc4#/Kb3#/Nc4# 1...Ne3/Na3 2.Kb3# 1...N:b4 2.Kc4# 1...Na1 2.Kc4#/Nc4# 1