Correct answer: Nf51.Rd3?? (2.Qd5#) but 1...f5! 1.Nbc4+?? 1...Ke4/Kd4 2.Rd2# but 1...Ke6! 1.Nf5! zz 1...Ke4 2.Rc5# 1...Ke6 2.Rb5# 1.