Correct answer: Nf71.Nf5? ~ 2.N:d6 [+bNb8]# 1...N:f5 [+wNb1] 2.N:d2 [+bPd7]# 1...Nf7 2.Qb1# 1...Bg3 2.N:g3 [+bBf8]# 1...Bd4! 1.Nf7! ~ 2.N