Eliminating defenders

Eliminating defenders is a common theme in chess. One piece is holding up your progress or attack so you eliminate it even at the cost of material. 

One easy example is from tonight's online rapid 15 10 event. Black, a 2050 player, is clearly losing. His own King is cut off by the rook and the bishop can't hold everything. Note White's active King. In endgames you must activate your King if you want to win.

White to move.

Level: easy. I saw the move even before Black played Bd5.

1. Rxd5! Of course! White eliminates the last defender and the a pawn Queens. 1-0

Remember to eliminate defenders.