Correct answer: Na31.Qd5?? (2.Q:f3#) 1...B:b3 2.Nb5# but 1...Bb1! 1.Qc8?? zz 1...B:b3 2.Nb5# but 1...Bb1! 1.Qa8?? (2.Q:f3#) 1...Bb1 2.