Diving chess

It was invented by Etan Ilfeld;[1] and, since 2013, it has been included as one of the disciplines in the annual Mind Sports Olympiad.

[2] Diving chess is played at the bottom of a swimming pool, using a chessboard with magnetic chess pieces.

The players dive underwater to observe the position and consider and play their move before they resurface to take a breath.

[clarification needed] Such chess games last on average one hour, where the combination of physical and intellectual performance is a challenge: to manage one's oxygen levels while making good chess moves.

Players are not allowed to use any oxygen-supplying device, but they may wear diving masks or swimming goggles.