Main motif of this puzzle: Decoy into pin
A decoy is a sacrifice that lures an opponent's piece to a square where it can be attacked in a subsequent tactic.
An attack on a piece is called a pin, when moving it out of the attack would expose a more valuable piece behind it.
Learn more in this guide.
The hint button is in beta test. We recommend to use the button only after you've thought about the puzzle for some time without finding any idea.
Read more about the hint button in this blog post.