What are some relatively unknown sports? - Quora

Chess boxing - Wikipedia

Cheers galore as chessboxing kicks off in France

Competitors battle it out in alternating rounds in the ring and on

Competitors battle it out in alternating rounds in the ring and on

GM Aman Hambleton defeats IM Lawrence Trent by TKO in Ludwig's Mogul Chessboxing Championship : r/chess

Chess Boxing, The YoGPoD Wiki

6 Fun and Unusual Sports You've (Probably) Never Heard Of

Chess Daily News by Susan Polgar - Chess Boxing - Is this for real?

FIDE Master Tihomir Dovramadjiev - The First European Chess Boxing Champion, 1 October 2005, Berlin by FIDE Master Tihomir Dovramadjiev PhD - Issuu

Pass it to Bulis: Weird Sports, Vol 2: Chess Boxing