Section A1
1.Bf6!
( not enough 1.Qxf5+? Kxd8 2.Kb6 Qxc6+!
( 2…Ne7? 3.c7# )
3.Kxc6 Ne7+ =, quiet )
1…Nxf6
( 1…Qe6 2.Qd3! Nxf6 3.exf6 Kc7
( 3…Qe5+ 4.Kc4 Qe6+ 5.Qd5 +- )
4.Qg3+ Kc8 5.Kc5! Qxf6 6.Qg8+ Qd8 7.Qe6+ Kc7
( 7…Kb8 8.Qb3+ +- )
8.Qf7+ Kb8 9.Qb7# )
( 1…Nh6 2.Qa2! Kb8 3.Kb6 +- )
( 1…Ne7 2.Bxe7 Qxe7 3.Qxf5+ Kc7 4.e6 +- )
( 1…Kc7 2.Qc5 Qb8+ 3.Kc4 Nxf6 4.Qd6+ +- )
2.Qxf5+
( 2.exf6? Qe5+ 3.Qc5 Qxf6 =, quiet )
2…Nd7
( 2…Kc7 3.Qxf6 Qb8+ 4.Kc5!
( 4.Kc4? Qg8+! )
4…Qb6+ 5.Kd5 Qb5+ 6.Ke6 Qxc6+ 7.Kf7 Qd5+ 8.e6 Qh5+ 9.Kf8 +- with pawn promotion to queen )
3.e6!
( premature 3.cxd7+? Qxd7+ 4.Qxd7+ Kxd7 =, quiet )
3…Nb8 4.e7+ Nd7
( 4…Kc7 5.Qf4+ Kc8 6.Qf8 +- )
5.cxd7+!
( 5.Qxd7+? Qxd7 6.cxd7+ Kxd7 =, quiet )
5…Qxd7+ 6.Kb6!! Qxf5 7.e8=Q#
model mate
1-0