Correct answer: Qc81...K:d5 2.Rb5# 1...d:c5 2.Kf3#/Kg3#/Ke3#/Ke5# 1.Rc8?? zz 1...K:d5 2.Rb5# 1...c:d5 2.c:d6# 1...d:c5 2.Ke5# but 1...K:c5! 1.