Correct answer: Rf41...Kb5 2.Bc4# 1...K:b7 2.Bd5# 1...Q:f2 2.Bd1# 1...Q:b3+ 2.Q:b3# 1...R:f2 2.B:a2# 1.Nd7+?? 1...K:b7 2.Bd5# but 1...K<