This expression means, in effect, “the official rules” governing a particular situation. Edmond Hoyle was a real person who, in 1741, wrote A Short Treatise on the Game of Whist, whist being a forerunner of bridge. This popular book settled many arguments about the game and has been revised over the centuries to give the rules of many card games. Hoyle’s name has been used ever since to represent the authority of accepted and ethical behavior not only in card games but in many life situations.
Are you playing according to Hoyle today?