A book I read in the school library in the early 1980s. Colour sci-fi picture book with full page pictures (i.e., not just illustrations) and several short stories. I think there was a massive spaceship on the front cover. The book was a similar size and format to The Electric State by Simon Stalenhag.
One short story had two male citizens of an advanced society chosen - at random? - for a compulsory duel to the death. Might have been a similar idea to the Hunger Games i.e., as entertainment / to alleviate boredom. One of the duellists eschewed modern weaponry and opted for traditional hunting gear and woodcraft. He locates the empty camp of his opponent with the fire still ablaze. The opponent has been hiding and promptly cuts the traditionalist in half with some sort of laser weapon