A special case of discovered attack is shown in this diagram. White plays 1.Rxc7+, where the check is not from the Rook, but from the Bishop. This is called a discovered check. A special case of discovered check is where the moving piece also checks the opponent's King. This is called double check. The only response to a double check is a King move.
Black has only 1...Kg8 as a reasonable response. The game continues 2.Rg7+ Kh8 3.Rxb7+, and White will eventually win the Rook on a8. The combined action of the white Rook and Bishop is called a windmill.
