On the front page, the description under a link to a statement about sambo and doping claims that in chess there is doping. That is somewhat inaccurate. There is a Anti-Doping Commission in chess, but there is no evidence that any drug improves chess performance. The real reason that there is an Anti-Doping Commission is that politicians in the World Chess Federation (FIDE) wanted to be part of the Olympics. The only way to do that was to have Anti-Doping in place.
Also, chess is a sport.