
Solution
1.S8d

if 2.Rx8d, 3.Bx7c+
中飛車

1.S8d

if 2.Rx8d, 3.Bx7c+

1.B*6e

if 2.B*5d, 2.Bx5d 3.Px5d 4.P5e 5.Px5e 6.B*6e 7.B*4c 8.Bx4c+ 9.Kx4c 10.B*6e.

1.N6e

if 2.Px5e, 3.Nx5c+ 4.Gx5c 5.B*7a 6.R5b 7.S*4a

1.B*9g

if 2.R8i+, 3.Bx5c+

1.P*8c

if 2.Rx8c, 3.B*6a

1.G6h

the Promoted Bishop is trapped.

1.P*6c

if 2.Sx6c, 3.P5c+

1.B*9g

if 2.R8b, 3.Bx6d

1.Rx5b+

if 2.Gx5b, 3.Bx2b+ 4.Kx2b 5.B*5e
if 2.Bx7g+, 3.+Rx4a 4.Kx4a 4.Nx7g

1.Rx5d

if 2.Gx5d, 3.S*6c