Main motif of this puzzle: Decoy into trapped piece
A decoy is a sacrifice that lures an opponent's piece to a square where it can be attacked in a subsequent tactic.
An attacked piece is trapped, when the attack cannot be defended without losing material.
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.