Sport in the United Kingdom Until 2008, automatic promotion and relegation existed between Super League and the Championship when it was replaced by three-year licences for clubs to play in the former. Promotion and relegation returned to Super League and the Championship in 2015. The main knock-out competition is the Challenge Cup, which also includes clubs from France and Canada, and in the past has also included clubs from Russia. Rugby league is also played as an amateur sport, especially in the heartland areas, where the game is administered by BARLA. Since the rugby union authorities ended the discrimination against playing rugby league amateur numbers
Calcutta Polo Club in the city. The first Ezra Cup was held in 1880. As part of its 150 years celebration, the Calcutta Polo Club organized Ezra World Cup at the Pat Williamson Ground, Kolkata from 18–25 December 2011. It has been doing so since 2006 when the game was revived in Kolkata by Calcutta Polo Club president Keshav Bangur. Calcutta Polo Club is in its 150th year making it the oldest polo club in the world still in existence, and the hosts made the 2011 season a treat to remember. Calcutta is also home to the oldest polo ground in the world