Queens Gambit Declined Orthodox Defense Hanging Piece in Chess

In the Queens Gambit Declined Orthodox Defense, the “Hanging Piece” idea means a key unit becomes unprotected after a typical pawn/figure exchange sequence, leaving it vulnerable to capture. A defining feature is the central tension around d5/c4 and the common development of pieces to natural squares, where one move can accidentally remove the defender of a pawn on d5 or a piece supporting it.