Zhu Ying, or Ivy, is the most popular Chinese snooker referee. [Photo provided to chinadaily.com.cn]

Zhu Ying, or Ivy, is the most popular Chinese snooker referee who began officiating on the professional circuit during the 2012 season. Zhu is the first Chinese referee to appear at The Crucible. After lengthy training in China and several months in England, she qualified to become one of the WPBSA (World Professional Billiards and Snooker Association) referees and started appearing in televised tournaments.