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Chess and swimming may seem like an unusual combination, but for CM Michal Mazurkiewicz from Poland, it is the perfect blend of mental and physical endurance. The 34-year-old has made waves by earning a well-deserved spot in the Guinness World of Records for the "Most simultaneous diving chess opponents." The Guinness Book of World Records is the world's most-sold book, tracking many spectacular records, including chess. Chess.com previously covered all Guinness chess records, from the longest chess marathon to the "Fastest time to arrange a chess set while being blindfolded." Among the many spectacular records, Mazurkiewicz has secured his Guinness record in diving chess, perhaps one of the most unique disciplines. The physically demanding sport is played in a swimming pool. A submerged chess board with magnetized pieces keeps everything in place. This video from the 2024 Diving World Championship exemplifies how this is done