Section B1 – Min Win
1.g7!
( 1.Kd7? Bb4 2.g7 e2 3.g8=Q e1=Q = because Qe8 is not a check )
( 1.Kd8? e2 2.f8=Q Ba5+ = )
1…e2 2.g8=Q
( 2.f8=Q? Bb4+ 3.Kd7 Bxf8 4.gxf8=Q e1=Q = )
2…Bb4+ 3.Kd8!
( 3.Kd7? e1=Q = because Qe8 is not a check )
( 3.Kf6? Be7+!
( 3…e1=Q? 4.Qe8+ +- )
4.Kxe7 e1=Q+ leads to perpetual check, e.g. 5.Kf8 Qb4+ 6.Kg7 Qd4+ 7.Kh7 Qh4+ = )
3…Be7+
( 3…e1=Q 4.Qe8+! +- )
4.Kd7! e1=Q 5.Qe8!
Pin and battery.
5…Qb4 6.Ke6+!
Forcing the black king to step on a bad square.
( 6.Qxe7? Qb7+ leads to perpeutal check, e.g. 7.Kd6 Qb4+ 8.Ke6 Qe4+ 9.Kf6 Qh4+ 10.Ke6 Qe4+ 11.Kd7 Qb7+ 12.Ke8 Qb8+ 13.Qd8 Qe5+ 14.Kf8 Qh8+ 15.Ke7 Qe5+ 16.Kd7 Qd5+ )
6…Ka5
( 6…Ka3 7.Qxe7 +- )
7.Qxe7 Qe4+ 8.Kd7
( 8.Kf6 Qh4+ loss of time )
( 8.Kd6 Qb4+ loss of time )
8…Qb7+ 9.Ke8
( 9.Kd8 Qb8+ loss of time )
9…Qb8+ 10.Qd8+ 1-0