1.Ng4+!
1.Ng2+? Kf3= or 1.Ne8? Rd1=
1...Kd2 2.c4! with two lines
2… Kxe1 3.a5 Rd1
3...Kd2 4.c5 Rd4+ 5.Kb5 Kc3 6.Ne3 Rb4+ 7.Ka6 Kd3 8.c6 Rxe3 9.c7 Rc4 10.Kb6 Kd3
11.a6 Rb4+ 12.Ka5 Rc4 13.a7+-
4.c5
4.Ne3? Rc1 5.Kb3 Kd2=
4...Rb1+ 5.Kc4
5.Ka4? Kd2! 6.a6 Kc3 7.c6 Rb6!=
5...Rc1+ 6.Kb5
6.Kb4? Ke2! 7.Ne5 Ke3! 8.a6 Rb1+!=
6...Rb1+ 7.Ka6
7.Kc6? Ke2 8.Ne5 Ke3 9.a6 Ra1 10.Kb6 Rb1+=
7...Rc1 8.Ne5 Rxc5
8...Kd2 9.c6 Ke3 10.Kb7 Rb1+ 11.Kc7 Kd4 12.Kd6+- (12.Nd7? Kc4! 13.a6 Kb5! 14.a7
Ta1!=)
9.Nd3++- fork 1
B) 2...Rb6+ 3.Kc5!
Try : 3.Ka5? Rb8 4.c5 Kc3 5.c6 Kb3=
3… Rb3
3...Ra6 4.Kb5 Ra8 5.a5 Rb8+ 6.Ka6 Ra8+ 7.Kb6 Rb8+ 8.Ka7+-
3...Re6 4.Nf3++
4.a5!
Try : 4.Ng2? Rb8 5.a5 Rc8+ 6.Kb5 Rb8+ 7.Ka6 Kc3 8.N2e3 Kd4=
4...Kxe1 5.a6
Try :5.Ne5? Kd2 6.a6 Kc3 7.a7 Ra3 8.Nc6 Ra2/a1 9.Kb5 Rb2+ 10.Ka6 Ra2+ 11.Na5 Kb4!=
5...Kd2 6.a7 Ra3 7.Kb6 Rb3+ 8.Ka6 Ra3+ 9.Kb7 Rb3+ 10.Ka8 Rc3 11.Ne5 Rc2 12.c5 Rxc5 13.Kb7 Ra5 14.Nc4+!+- fork 2
