F Fred and Wilma Flintstone in the "Flintstones" cartoon
... or a real life example...
Fischer and Spassky - chess feudsters extraordinaire. Bobby and Boris carried out their own version of the Cold War on a board grid of 8 x 8 squares. Their battle seemed to go on for ages . There were many ludicrous claims of cheating, threats to walk out, etc, which were probably more entertaining than the games of chess themselves, to the extent that very few people remember who actually won!