Section A1 – Win
1.Kc3!
( 1.Kxa1 -+ )
( 1.g7 Bd4+ )
1…Kc6
( 1…Bxb6 2.g7 Rc8+ 3.Kd3 +- )
2.g7 Rd8 3.a8=Q+!
Deflection of the rook from the d-file
( 3.h7 Bd4+ -+ )
3…Rxa8 4.h7 Ra3+ 5.Kd2
( 5.Kc4 Nc2 6.g8=Q Ne3# )
( 5.Kb2 Bd4+ 6.Kxa3 Bxg7 -+ )
5…Nb3+ 6.Kd3! Nd4+ 7.Ke4
( 7.Kd2 Bb4+ -+ )
7…Ne6
( 7…Ne2 8.h8=Q!
( 8.g8=Q Re3+ 9.Kf5 Rf3+ =, quiet 10.Kg6 Rg3+ 11.Kf7 Rf3+ 12.Ke8 Re3+ 13.Kd8 Bxb6+ 14.Kc8 Bd4 =, quiet )
8…Re3+ 9.Kf5 Rf3+ 10.Kg6 Rg3+ 11.Kf7 Rf3+ 12.Ke8 Re3+ 13.Kd8 Bxb6+ 14.Kc8 +- )
( 7…Nb5 8.h8=Q!
( 8.b7 +- )
( 8.g8=Q Bd4 =, quiet )
8…Nd6+ 9.Kf4 +-
( 9.Ke5 Nf7+ =, quiet )
)
8.g8=Q +-
( 8.h8=Q Nxg7
( 8…Re3+ 9.Kf5 Nxg7+ 10.Qxg7 =, quiet )
9.Qxg7 =, quiet )
8…Re3+ 9.Kf5
White wins. For example:
9…Bd4 10.h8=Q Bxh8 11.Qxh8 Kxb6
( 11…Re2 12.Qb8! )
12.Qb2+! +- 1-0