Correct answer: Kb21...b5 2.Qa7# 1...Ne6/Nf7/Nc6/Nb7 2.N:e6# 1.b5?? zz 1...Ne6/Nf7/Nc6/Nb7 2.N:e6# but 1...Kc5! 1.Ka2?? zz 1...N
