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Watch: Underwater chess champions compete for world title
SOURCE:BBC World
Using weighted pieces and magnetic boards, players of the hybrid sport must complete each move in one breath.
The Diving Chess World Championships has taken place in Groningen, Netherlands, with players using weighted pieces and magnetic boards.
Competitors must also complete each move in a single breath before resurfacing for air.
Former Dutch champion Zyon Kollen was crowned the men's champion while 17-year-old Josephine Damen, also from the Netherlands, took the women's title.