Prepare for the opponent's attack

Quiz; What will you move in figure. 1?

figure. 1

In playing shogi, it's important to foresee the next effective attack by opponent and prepare or (defend) for it in advance.

If you attack as like L*4c, the opponent would move P*1f (figure. 2).

This attack is severe, because if you take Sx1f, the opponent would +R3h, else if you take Kx1f, then Lx1e, Kx1e, +Rx1h, Sx1h, L*1d (check mated).

figure. 2

Therefore it's necessary to prepare for the opponent's attack Px1d in figure. 1.

So I moved G-3i (figure. 3).

One of objects of G-3i is to capture the opponent's Dragon, and the other is to make it possible to take Sx1f against the opponent's attack Px1f (G-3i is reached by B-6f).

figure. 3

By G-3i, I succeeded in shutout the opponent's attack.

The entire kifu is shown below.