Correct answer: b71...e3 2.f5# 1...c4 2.b7# 1...d6/d5 2.Nc6# 1...g5 2.Nf5# 1.Bb8?? (2.Be5#) 1...d6 2.Nc6# 1...e3 2.f5# but 1...c4! 1.Kf7?? zz 1...d6/d5 2.Nc6# 1...