1.Bh2!
[Thematic try 1.Bxa7!?
Ke2
2.a4
Kd3
(2...Kf3??
3.Bb6+-
) 3.a5
Kc4
4.Bb6
Kb5=
] 1...Ke2
[1...Kf2
2.Kg4
Ke3
3.Kf5
Kd4
4.Ke6
Kc5
5.Kd7
Kb6
6.Kc8+-
; 1...a5
2.Kg4
Ke2
3.Kf5
Kd3
4.Ke6
Kc4
5.Kd7
Kb4
6.Bd6++-
; 1...a6
2.Kg4
Ke2
3.Kf5
Kd3
4.Ke6
Kc4
5.Kd7+-
] 2.Kg4
Kd3
[2...Ke3
3.Kf5
Kd4
4.Ke6
Kc5
5.Kd7
Kb6
6.Kc8+-
; 2...a5
3.Kf5
Kd3
4.Ke6
Kc4
5.Kd7+-
] 3.Kf5
Kc3
[3...Kc4
4.Ke6
Kb4
5.Bd6+
Ka5
6.Kd7
Kb6
7.Kc8
a5
8.Kb8+-
; 3...Kd4
4.Ke6
Kc5
5.Kd7
Kb6
6.Kc8+-
] 4.Bd6!
Kc4
[4...a5
5.Ke6
Kc4
6.Kd7+-
] 5.Ke6
Kb5
[5...a5
6.Kd7+-
] 6.Kd7
Kb6
7.Kc8
a5
8.Kb8+-