A relative pin

Pinning a piece in chess is when you are directly attacking certain piece and if your opponent moves that piece, you will be in direct attack towards his king or Queen, meaning they have to choose whether to keep the pinned piece there and risk losing it or move the piece which makes the other piece pinned. This puzzle is about a relative pin which probably means you can get out of the pin with some tricky maneuver.

We'll see in the comment section.