Chess Boxing

The sport of chess boxing is a martial art combined with the game of chess.
Boxing skills wear down your opponent and make it difficult for him or her to concentrate on the mental challenge of speed chess. Players must make a chess move within 10 seconds. The match can be won in any round by a knockout or a checkmate.
No, you are not allowed to hit your opponent with the chess board.
Chess Boxing Rules
"Since 1992 the sport has gone global with countries including England, Germany, Netherlands, France, Russia and Japan all embracing the new sport.
Players have to be skilled in both boxing and chess to compete at the highest level...Players go head to head in chess boxing and the match starts with a four minute round of chess.
The players then go into the ring for a three minute round of boxing before again returning to the chess board.
The match consists of 11 rounds in all (6 rounds of chess and 5 rounds of boxing) with 1 minute intervals between rounds." Chess Boxing Rules
Introduction to Iepe Rudingh, Inventor of Chess Boxing
ESPN Video: "What is chess boxing, and how did it become a sport? Chess boxing inventor Iepe Rubingh explains the origins and rules of his quirky sport, which was inspired in part by a comic."
It's London vs Berlin: "...and please don't mention the war." Chess Boxing founder and President of the Chess Boxing Club Berlin, Iepe Rubingh, a Dutchman, talking trash to the Brits preparing to engage in chess boxing battle with Germany. Video: Chess Boxing Message from Berlin for London
Sadly, Iepe passed away at the age of 45 (17 August 1974 to 8 May 2020).
Photo Credit: Chess Boxing Demands a Rare Breed of Human: The 'Nerdlete'