Correct answer: Qb51...d:e4 2.Qd6# 1.Nc5?? (2.Qb8#/Qc7#) 1...Nc6 2.Qc7# but 1...Na6! 1.Qc7+?? 1...K:e6 2.Nc5#/Nd8# but 1...K:e4! 1.B