Correct answer: Kf51...c:d6 2.Qc1# 1...Nb6 2.Rc5# 1.Qe6?? (2.Qd5#) 1...c:d6 2.Qc4# 1...Nb6 2.Rc5# but 1...d:e6! 1.Qg5?? (2.Qd5#/Qc5#) 1...K