Correct answer: Kc51...Nfg4/Nh1/Nh3/Nd1/Nd3 2.Nd3# 1...N:e4 2.R:e4#/Nd3# 1...Nhg4/Ng8/Nf7 2.Nf7# 1...N:f5 2.Nf7#/Q:f5# 1...Q