Queens Gambit Declined Discovered Check Intermediate Chess Puzzles

In the Queens Gambit Declined, a discovered check happens when one piece moves and reveals a check from a rook, bishop, or queen that was previously blocked. For an intermediate player, this usually appears after the center opens or a pinned piece shifts, creating a forcing tactic from the QGD structure. The defining feature is that the checking line was already aimed at the king, but the move of an intervening piece suddenly activates it.