Correct answer: Kc71...Kg7 2.Ke6# 1...B:d6 2.K:d6# 1...Nc6 2.K:c6# 1...Nc8 2.K:c8# 1.B:c4+?? 1...Kg7 2.Ke6# but 1...b:c4! 1.Rf8+?? 1...