A four-color deck (US) or four-colour pack (UK) is a deck of playing cards identical to the standard French deck except for the color of the suits. In a typical English four-color deck, hearts are red and spades are black as usual, but clubs are green and diamonds are blue. However, other color combinations have been used over the centuries, in other areas or for certain games. No-revoke decks Four-color decks made for trick-taking games such as bridge, whist, or jass are often called no-revoke decks because they are perceived to reduce the risk of a player accidentally revoking (illegally playing a card of a suit other than that led). Dozens of card manufacturers have developed four-colored suit cards for bridge during the 1900s and continue into this century. The earliest such deck in the US is by J. Y. Humphreys who created the "Seminole Wars Deck" in 1819, which had four colored suits of blue spades, green clubs, red hearts and yellow diamonds. In the German game of skat the official tournament standard since the 1990s is to use a no-revoke deck known as a Turnierbild deck. In these decks, spades are green and diamonds are yellow, the clubs and hearts being respectively black and red as normal, which also reflects the suit order: clubs, spades, hearts, diamonds. This is intended as a compromise for players (typically from former East Germany) who prefer German suits over French; the green spades translate to leaves and the yellow diamonds to bells in the German suits. In 1922, August Petryl & Son produced a tarock deck with black clubs, yellow diamonds, pink hearts, and green spades in the United States. They were sold in two versions, a full 78-card deck and a 54-card deck. The smaller deck is structured the same as Industrie und Glück decks as it was designed to play a variant of Königrufen. The basic principle of this is to forestall any confusion of suits, especially in trick playing games in which following of suit led properly is a necessity, by altering one black suit and one red suit in some manner. The usual method of accomplishing this means is by alteration of color. Historically, the usual changes have been with diamonds yellow or orange and clubs green, although in more recent times, an increasingly large number of such decks have been produced in which diamonds are blue. Over