Black to move. Find the one move that wins. About 1450 ELO.
From a real ChessLvl game against Yuki Tanaka (LVL 1). Black to move: one move wins.
No check, no capture: the best move is a quiet one that creates an unstoppable threat.
No check, no capture: a calm move that creates a threat your opponent can't meet.
When no forcing move works, look for a move that threatens two things at once.
Strong players look past checks and captures. A quiet move that threatens two things can be deadlier than either.
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.