1) rd1 qxc4
White has an "Absolute Pin" with "Diagonal Mobility" on Black's Queen and then "Skewer's" the Queen and Rook with his Rook. Black must move his Queen or lose it.
2) rd8+ kg2
The Rook is "Captured With Check" and Black "Must Move Checked King."
3) bc wins White wins a piece due to this "Exchange Combination"
