From the cerebral strategy of the chequered board to the rowdy razzmatazz of the ring, you might think chess and boxing are at opposite ends of the sporting spectrum.
But the bizarre hybrid sport of chessboxing is now heading into its 20th anniversary year - and a Norfolk farmer is fighting its corner.
Gavin Paterson, who farms at Worstead, near North Walsham, is a director of promotions company Chessboxing Nation.
He runs events described as a "wild mix-up of two of mankind’s oldest sporting obsessions", with alternative rounds of speed chess and boxing until the victor wins by checkmate or knockout.
Mr Paterson said he became "intrigued by the sport" after seeing an event at Bethnal Green Working Men's Club in 2009.
Although a keen chess player, he had never boxed before stepping into the ring for his first bout in 2014, part of a fundraising event for his educational charity, Yellobric. After that he got involved in running the national promotion company.
"Initially, when I first went to watch it, I thought it was going to be really odd and weird," he said.
"But as I got more involved in the community you realise the people attracted to the sport are really interesting oddballs, lovely people who generally come from a chess background, but who don't usually have any experience of combat sport.
"They come to fight to lose a bit of weight and gain confidence and it is really nice to see people coming out of their shell."
Although knockouts do happen, most chessboxing bouts are decided on the board - but Mr Paterson said chess becomes much harder after slugging it out for three minutes in the ring, so it is not always the best chess player who wins.
"When you realise the way the two sports affect each other, it makes much more sense," he said.
"Even if you are a really good chess player, if you try and play chess after a really hard boxing round when you have been pummelled, it is almost impossible."
The chessboxers, who wear headphones during the game so they cannot hear the live commentary, also work with a performance coach to excite the crowd with a persona in keeping with their ring name.
Mr Paterson fought under the name Grievous Bodily Farmer.
"The people the audiences love the most are the ones that engage with them and show a bit of personality," he said.
"Farming has got nothing to do with chess or boxing, but people want to buy into you as a person, and where you are from."
Mr Paterson has not fought since 2014, and his record is three fights, three losses - one checkmate, a chess time-out and a technical knockout.
The first time the words chess and boxing were combined is believed to be in the 1979 Kung-Fu movie Mystery of Chessboxing, which later also became a song title for hip-hop group the Wu-Tang Clan in 1993.
The first concept of the two disciplines as a single sport was in a 1992 graphic novel created by Enki Bilal. The first official chessboxing bout was in Berlin in 2003.
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