White to move. Find the one move that wins. About 1100 ELO.
The queen and king line up. Use it.
Put a protected bishop on the diagonal between them.
An attack through one piece to a more valuable piece behind it, so the front piece can't move.
Look along files and diagonals that run through an enemy piece to their king or queen.
When a piece sits in front of its king on a line, a pin wins it. Check diagonals and files through the enemy king.
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.