Yuki's Fearless Discovery: a discovered attack puzzle

White to move. Find the one move that wins. About 1350 ELO.

From a real ChessLvl game against Yuki Tanaka (LVL 1). White to move: one move wins.

Hint

Move one piece out of the way and let another piece behind it attack.

What is a discovered attack?

Move one piece out of the way so another piece behind it attacks. Two threats in one move.

How to spot it

Find your own pieces lined up behind each other, aimed at something valuable.

Tip

Discovered attacks hit twice: the piece that moves and the one it uncovers. Look for pieces lined up behind your own.

Solve it on the board above, or take a hint. Every ChessLvl puzzle is checked by a chess engine to have exactly one best move.