Correct answer: Nd31...Ke6 2.Ba2# 1.Bf8?? zz 1...Ke6 2.Nc7# but 1...d6! 1.Bb4?? zz 1...Ke6 2.Nc7# but 1...d6! 1.Ba3?? zz 1...Ke6 2.Nc7# b
