Archfiend
According to the Upper Deck website, "Archfiend is a special category of card. Most Archfiends can be identified by their name. Any card with "Archfiend" in the card name, is an Archfiend." This category was officially introduced with the release of Dark Crisis, as a way to standardize the English translation of OCG card names containing "Demon" 「デーモン」.
Some of the Archfiends are chess themed including Terrorking, Infernalqueen, Desrook, Darkbishop, Shadowknight and Vilepawn Archfiend, all of whom are named after chesspieces and feature a chessboard pattern as their backround. The support card Checkmate is named after Checkmate.
Since some Japanese cards with names containing "Demon" 「デーモン」 had already been released in the English TCG, they were retroactively classified as "Archfiends", although their official names were left unchanged. These include:
