Correct answer: Kb51...Kc4 2.Re4# 1.Qg3?? zz 1...Kc4 2.Re4# but 1...d5! 1.Qf3?? (2.Re4#) but 1...d5! 1.Qa3?? zz 1...Kc4 2.Re4# but 1...d5! 1.