Blackmar Diemer Gambit Accepted Ryder Gambit Trapped Piece in Chess

In the Blackmar-Diemer Gambit Accepted Ryder Gambit, White’s sacrifice lures Black into accepting the pawn and then allowing a specific piece to become “trapped” by limited escape squares. The defining feature is that after the Ryder-style follow-up, Black’s piece (often the knight that has ventured to a vulnerable square) can be boxed in by White’s pawns and piece placement, making retreat impossible without losing material.