The Swedish Chess Computer Association ("Svenska schackdatorföreningen" (SSDF) in Swedish) is an organization that tests computer chesssoftware by playing chess programs against one another and producing a rating list. On January 3, 2006, the list was released with Fruit 2.2.1 leading with an estimated ELO rating of 2852. 1990s Pressure-sensory Chess Computer with LCD screen The idea of creating a chess-playing machine dates back to the eighteenth century. ... Computer software (or simply software) refers to one or more computer programs and data held in the storage of a computer for some purpose. ... January 3 is the 3rd day of the year in the Gregorian calendar. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... Fruit is one of the strongest chess programs in the world today. ... The ELO rating system is a method for calculating the relative skill levels of players in two-player games such as chess and Go. ...