Correct answer: Na31...f:g5 2.N:f5# 1...d5 2.b8Q#/b8B# 1...Ng8/Nd5/Nc6/Nc8 2.Qd5# 1...Bg3/Bh2/Be3 2.Qe3# 1.b8N?? (2.Nd7#) but 1...d5!
