Correct answer: Kc11...Bf4 2.R:e7# 1...g5 2.Rf5# 1.Kc3?? (2.Nc4#) but 1...Be1! 1.Kb2?? (2.Nc4#) but 1...Rh2! 1.Kd1?? (2.Nc4#) but 1...Rd8!
