Black to move. Find the one move that wins. About 1100 ELO.
From a real ChessLvl game against Yuki Tanaka (LVL 1). Black to move: one move wins.
Count attackers and defenders. One capture comes out ahead.
A capture that comes out ahead once all the trades on that square are done.
Count attackers and defenders on the square, and the value of what gets traded.
When pieces trade on one square, count: if you have more attackers than they have defenders, the capture wins material.
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.