Blackmar Diemer Gambit Declined Vienna Defense Skewer in Chess

The Blackmar Diemer Gambit Declined Vienna Defense Skewer is a tactical motif where Black’s pieces get “lined up” and a skewer forces a more valuable piece to move, exposing a cheaper target behind it. In this family, it typically grows out of the Vienna setup after the Blackmar-Diemer Gambit is declined, with White’s active pieces (often the queen and a bishop) creating the line that makes the skewer possible. The defining feature is the skewer alignment: one piece is pinned/skewered along a file, rank, or diagonal so the back piece cannot stay protected.