The World Darts Federation recognise many darts tournaments each year including major titles such as the Lakeside World Professional Championship and the Winmau World Masters. Through 2007, the WDF had held four majors which constituted the Grand Slam, until the Topic International Darts League and Bavaria World Darts Trophy were cancelled in 2008 following the withdrawal of the Dutch broadcasters SBS 6, when it was announced that PDC players, including Raymond van Barneveld, Jelle Klaasen, and Michael van Gerwen would not be competing. Tournaments Tournaments listed below are recognised by the WDF and ranked accordingly to their point allocation system but are not organised or run by them they are staged by WDF member associations, councils federations and organisations. The only tournaments organised and operated by the WDF are the international Majors such as the WDF World Cup which is held every two years and the continental championships the WDF internationals and the Welsh Open they operate similar to the International Tennis Federation who only stages Grand Slam events. Tournament levels and points allocation A player's WDF Ranking is based on the total points they have accrued over the previous 12-month period that run from December to December according to the tournament schedule from the following 85 tournaments: The five World Darts Federation Major tournaments. The thirteen World Darts Federation Category One tournaments. The twenty six World Darts Federation Category Two tournaments. The thirty seven World Darts Federation Category Three tournaments. The four Major international events WDF World Cup (singles, pairs, team), WDF Americas Cup (singles, pairs, team), WDF Europe Cup(singles, pairs, team) and WDF Asia-Pacific Cup(singles, pairs, team). Ranking method Since the formation of the WDF rankings in 1974 the method used to calculate a player's ranking points has changed several times. Notes: The WDF international tournaments have six categories for both men and women (singles, pairs and teams) Current points distribution Points are currently awarded as follows: Majors Category 1 Category 2 Category 3 Special category events Major International events Other international events Six Nations Cup Former events Notes: As of 2016 category 4 events have ceased. See also List of BDO ranked tournaments References External links WDF tournament categories and points allocations WDF Tournament Details 2015 WDF tournament archives Dutch site BFI Database List of archives for darts on television IDPA website list current years winners, runner-up, semi-finalists and quarter-finalists Darts tournaments