We need to defend the Knight on f2. But how?1.Kg3...1.Kg2Rxf2+(1...Bb6)2.Kxf2Bb6loses.1.Kg1Bb62.Rh5+Kg63.Rh2Rxf24.Rxf2a55.Kf1Bxf26.Kxf2a4loses.1....Rxf21...Bb62.Nd3Rd2(2...Rb33.Rd5)3.Rd5and White saves their Knight.2.Rh5+...2.Kxf2Bb62.Rd5Bb6(2...Ra23.Rxd8)3.Rd7+Kg8And Black stays with an extra piece.2....Kg62...Kg83.Kxf22...Kg73.Kxf23.Rd5...3.Kxf2Kxh53....Bb64.Rd6+Kf55.Rxb6Rxf3+5...axb66.Kxf2The White King is in the square.6.Kg2...A brilliant move!6.Kxf3Out of a sudden, Black has the IMPORTANT opposition.axb67.Ke3Ke58.Kd3Kd59.Kc3Kc510.Kb3Kb511.Ka3Kc4And you know what happens here from King+pawn vs King section.6....axb66...Ra37.Rb77.Kxf3...And now we are holding the opposition!7....Ke58.Ke3Kd59.Kd3Kc510.Kc3Kb511.Kb3