the main tour each summer. However, the second-tier Challenge Tour has visited Central and Eastern Europe somewhat more frequently. In 1995, the European Tour began a policy of co-sanctioning tournaments with other PGA Tours, by endorsing the South African PGA Championship on the Southern African Tour (now the Sunshine Tour). This policy was extended to the PGA Tour of Australasia in 1996, and most extensively to the Asian Tour. In 1998, the European Tour added the three U.S. majors – the Masters Tournament, the PGA Championship and the U.S. Open – to its official schedule. The leading European Tour players had all been competing in them for many years, but now their prize money counted towards the Order of Merit (a year later for the Masters Tournament), which sometimes made a great deal of difference to the end-of-season rankings. The following year, in 1999, the World Golf Championships were established with the three individual tournaments, also offering substantially more prize money than most European events, added to the European Tour schedule. Since the minimum number of events that a player must play to retain membership of the European Tour was eleven, the addition of the majors and WGCs meant that players could potentially become members, or retain membership, of the tour by playing just four other events. Players such as Ernie Els and Retief Goosen have taken advantage of this to play the PGA and European Tours concurrently. For the 2009 season, the minimum number of events required for members was increased to twelve; this coincided with the elevation of the HSBC Champions, previously a European Tour event co-sanctioned by three other tours, to World Golf Championships status. The minimum increased to 13 in 2011, but beginning in 2013 team events such as the Ryder Cup and Presidents Cup were allowed to count towards the minimum. In 2016 the 13-event minimum was changed to five events, not counting the four majors and four WGCs; while this change did not affect players eligible for all the majors and WGCs, it made it easier for players not eligible for these to retain European Tour membership while playing a full PGA Tour schedule. The minimum was reduced from five to four in 2018. In November 2021, the tour was retitled as the DP World Tour as part of a sponsorship agreement with Dubai-based DP World. Strategic alliance with the PGA Tour In November