Fabiano Caruana (White) Puzzle: Decoy — Attack
A discovered attack occurs when one piece moves away and uncovers the power of a rook, bishop, or queen behind it. Here, White combines that idea with a decoy: an apparently valuable piece is offered with check, drawing the black king onto a square where the hidden line becomes decisive. This is not a mating puzzle; the combination wins material by exploiting an overloaded defender, an exposed king, and a rook aligned on an open file.