Correct answer: f71...Nc7 2.Ndb6# 1...Nd6 2.Ncb6# 1...N:f6 2.N:f6# 1...f:e4 2.Bg4# 1...Qd8 2.e:d8Q#/e:d8R#/e8Q#/e8B# 1...Qf8 2.e:f8N#/e8Q