Attack a pinned piece (1)
You know that the pin is a very strong weapon. A pin is an attack on a piece that cannot or is not advised to escape. Otherwise, a stronger piece behind it falls.
Yet a pin alone is not always sufficient to win material. In fact, a pinned piece may be adequately defended. In that case, it may be beneficial to attack the pinned piece one more time.
Let's look at example 1 and example 2. In the first example, the piece behind the pinned piece is a king. In the second example, the piece standing behind the pinned piece is a piece that is worth more than the pinned piece.
What do you have to do?
Attack an opponent's pinned piece and win material.