Correct answer: Kb21...K:e4 2.Bg6# 1.R:d6?? zz 1...K:e4 2.Bg6# 1...d4 2.R:d4# but 1...K:c4! 1.Nc:d6?? (2.Bb5#/Qd2#) but 1...d:e4! 1.Qd2+??