Main motif of this puzzle: Decoy into discovered check
A decoy is a sacrifice that lures an opponent's piece to a square where it can be attacked in a subsequent tactic.
A discovered check is a move by one piece that reveals a check by another piece.
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.