Black to move. Find the one move that wins. About 1300 ELO.
From a real ChessLvl game against Yuki Tanaka (LVL 1). Black to move: one move wins.
Attack the big piece first. When it moves, what's behind it is yours.
A pin in reverse: attack a valuable piece that must move, and win the piece behind it.
Kings and queens lined up on a rank, file or diagonal are a skewer waiting to happen.
A skewer is a pin in reverse: the valuable piece is in front and has to step aside.
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.