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Solution
1.Sx3d
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if 2.Gx3d, 3.Rx5c+
中飛車
1.Sx3d
if 2.Gx3d, 3.Rx5c+
1.P*7e
if 2.Sx7e, 3.Rx6c+. if 2.P*6e, 3.R5f
1.B*7a
if 2.R7b, 3.Bx5c+ 4.Gx5c 5.Rx5c+
1.P*5d
if 2.S5c-x5d, 3.Sx5e
Black can’t play 1.Sx5e because of 2.P*5d
1.P4e
if 2.Sx4e, 3.P5c+