Restless Knights

Discovered by Knight (©SRT). The setup is a lot like in the Discovered at Home-Mate, except we have a knight instead of a bishop. The knight, who was between the attacking queen and the unlucky king, moves away so that the queen gives a discovered check. But because the knight also gives check it's a double check, (a very strong weapon) and since the checked king is boxed in by friendly pieces it's checkmate. This mate is also reminiscent of Alekhine's Smothered Mate.