Correct answer: Nd51...N:d3 2.c3# 1...Nd7/Ne6/Nb3 2.Qc4#/Qc3# 1...N:e4/Na4 2.Qc4# 1...a5 2.Nb5# 1...Rd5/Re6/Rf6/Rg6/Rh6 2.Q:d5#