Special attacks: discovered check (2)

In discovered checks it is important to make sure that the back piece cannot be taken.

But in example 1 it does not really matter.

In the other examples, White has to pay better attention. White has two ways to deliver a discovered attack. But only one is good. If he picks the wrong way, he loses points.

In example 2 White moves the front piece, attacking the enemy queen. But that’s not all. The front piece is now protecting the back piece. Smart move!

In example 3 White uses a different trick.
He places the front piece between the enemy queen and his back piece. The back piece is safe from taking.
White attacks the queen and checks the king. A nice way to win points!

What do you have to do?
Use a discovered check to win points.