Most people who don't play chess believe that the checkmate ends the game. They may not know they can also lose by overstepping the time limit or by resigning - something unheard of in other sports such as football, basketball or hockey.
Plagiarism was in the news lately and chess has its own champions. They use other people's material without attribution and present it as their own. To put it less elegantly, the offenders blatantly, unscrupulously and dishonestly steal work from other authors.