Black to move. Find the one move that wins. About 1250 ELO.
From a real ChessLvl game against Yuki Tanaka (LVL 1). Black to move: one move wins.
Line up an attack through one piece to a more valuable one behind it.
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.
A pinned piece can't move without exposing what's behind it. Attack it again and it usually falls.
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.