Correct answer: Bf31...Ne4+ 2.B:e4# 1...Ne8 2.B:e8# 1...Nf5 2.g5# 1...Nb5+ 2.B:b5# 1...Nb7 2.B:b7# 1.Ne8+?? 1...N:e8 2.B:e8# but 1...Ke6!