A player earns points depending on how far he gets in a tournament. Some tournaments are worth more points than others. Usually the bigger the draw and the higher the prize money the more points are available. The points from a player's best 18 tournaments over a running 52 week time frame determine his ranking. If a player player competes in more than 18 events again only his top 18 will count, therefore he can drop the points from bad events where he may have lost in the first round for example.