1.a5!

[1.Kb4? Ng6! 2.a5 Ne7 3.a6 Nc8 4.Ka5 Kf6!! (4...Ke5? 5.Nb7 Nf7 6.b6+-)

5.Nb7 Nf7! 6.b6 Ne5!=]

1...Nhf7

[1...Ng6 2.a6+-]

2.Kb4!

[2.a6? Nd6 3.Nb7 Nxb5+=;

2.Ka4? Nd6 3.a6 Nc8 4.Ka5 Kf6!!=]

2...Nd6

3.Nb7!! two knights fork

[3.a6? Nc8=]

3...N8xb7

[3...Ne6 4.Nxd6++-;

3...Nc8 4.Nxd8+-;

3...N6xb7 4.a6 Ke5 5.a7+-;

3...Nxb5 4.Nxd8 Nc7 5.Kc5+-]

4.a6 Nxb5

5.axb7

[5.Kxb5? Nd6+ 6.Kc6 Nc8 7.Kc7 Na7 8.Kb7 Nb5 9.Kb6 Nd6 10.Kc6 Nc8=]

5...Nc7

[5...Na7 6.Kc5!+- (6.b8Q? Nc6+=) ]

6.Ka5!+-

[6.b8Q? Na6+=]