Correct answer: Ba21...R:d6 2.Q:e4# 1...Ne3 2.Bg3# 1.N:d7+?? 1...K:d6 2.Qc5# but 1...R:d7+! 1.Rf5+?? 1...K:d6 2.Qc7# but 1...K:f5! 1.
