1.f6 Rg6!

1...Rxg2 2.f7 Rf2 3.Ngf5+-

2.Nh5!

2.Ne8? Rxg2 3.f7 Rf2=

2...Rxg2 3.Ng3!! Rh2 4.f7 Rh8 5.Ne6 Kd2 6.Kb2!

6.Ne4+? Kd3 7.Nf6 Kc3! 8.Ng8 Rh1+ 9.Ka2 Rf1=

6...Kd3 7.Kb3 Rb8+ 8.Ka3!

8.Ka4? Kc4 9.Ka5 Kd5 10.Nf4+ Ke5=

8...Kc4 9.Ne4 Rh8 10.Nf6 Rb8 11.Nd7!

try 11.Ne8!? Rb3+ 12.Ka2 (12.Ka4 Rf3=) 12...Rf3=

A) - 11...Rb3+ 12.Ka2 Rf3 13.Ne5+ win;

B) - 11...Rh8! 12.Nf4!

try 12.Ng5!? Ra8+! 13.Kb2 Rh8! 14.Ka3 Ra8+ positional draw

12...Kb5 13.Kb3 Kc6 14.Ng6 Rd8 15.Nf6 Kd6 16.Ne8+ win.   Authors