Chess players showed off their skills -- as well as their lung capacities -- at the World Dive Chess Championships in London.
The underwater chess tournament, which took place Saturday in London, featured players taking turns diving underwater to make their moves on a chess board submerged in a pool.
The rules require a player to make a move before coming up for air, and the next player must then go underwater until they have made a response move.
Organizers said the aquatic twist makes the ancient game of chess more challenging and faster-paced.
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