Correct answer: Nb51.Kf5?? (2.Qe5#) but 1...b5! 1.Bc2?? (2.Be4#) but 1...K:c6! 1.Bd1?? (2.Bf3#) but 1...K:c6! 1.f4?? (2.Qe5#) but 1...b5! 1.Qf4?? (2.