However, there is an interesting strategy that you don't move B-7g but K-3g (figure. 2).
figure. 1
figure. 2
When the opponent moves P-8f, you can cope with by Px8f, Rx8f, Bx7g (figure. 3).
figure. 3
If the opponent moves R-8b, you will form like as P*8f, K-4b, S-6g, K-3b, R-8h, G6a-5b, P-8e (figure. 4).
After that you can attack on 8th-line.
figure. 4
In the other hand, if the opponent moves Rx7f in figure. 3, you can attack like as S-6g, R-7d, R-8h, P*8d, P:8b (figure. 5).
figure. 5
I think this technique is interesting and has a surprising effect.