Correct answer: Rf71...B:d4 2.c4# 1...N:d4 2.Qg2# 1.Nf5+?? 1...B:e2 2.N:d6# but 1...K:f5! 1.Nc4+?? 1...K:d4 2.Bf2#/Qe3# but 1...Kf5! 1.