Solution
P*3i
Shogi Tesuji. how to use Pawn
P*3i
P*2d
1.P3c+
if 2.Nx3c, then 3.P*3d if 2.Gx3c, then 3.P*2b
1.P*3b
if 2.Gx3b, then 3.Rx2a+ if 2.G2b, then 3.P3a+
P*3c
P*3c
P*3c
Black will win material.
P4c+
1.P*8c 2.Rx8c 3.P*8d
Black will win the Rook or the promoted Silver.
P*3c
White will win material.
if Bx3c, then Rx2a+. if Rx3c, then Rx2b+. if Nx3c, then Rx3d.