played by that great athlete, phil taylor - come on you cannot clasify darts as a sport, he may be very skilled at directing a miniature arrow at a batch of pig bristles, but can hardly retrieve the darts without a rest or 2.
Darts is most definately a sport in all definitions of the word (unfortunately) although they may not be considering darts or chess for the olympics, they are sports. The same way javelin is a sport, as is darts.
when playing a sport, it should be played to the end.
however when playing chess, you can resign or play to the end, your choice
people who demand that others resign are possibly bad sports