 The older of the two sets in British-style pool are the World Eightball Pool Federation (WEPF) rules (often called "World Rules").The majority of WEPF members come from the UK and Ireland, and from current and former Commonwealth of Nations countries, plus a few leagues elsewhere.A competing but very similar set of rules has been promulgated by the larger World Pool-Billiard Association (WPA), under the game name "blackball" to better distinguish it from the American-style game (for which the WPA also promulgates the world-standardised rules).