It's strictly not just a game, but not a physical sport. It is competitive however, and there are professional players. I try to avoid calling it anything, but simply chess.
What is chess? Game or sport?

I consider it a game. To me, a sport requires some degree of physical fitness to be good at. Although being fit can make it a bit easier to concentrate and remain seated comfortably for longer periods of time, chess still isn't a sport in my mind.

Nice question. Hmm, do we consider Poker a sport? I'm not sure whether or not do they have it on Eurosport, but I know Chess once was there. Like, 20 years ago.

Poker is not a sport in my opinion. But chess is something more than just a game. Poker is mostly gambling. Whereas in chess, you expect good sportsmanship and it's more of a gentlemen's game.

It sucks because there's so much meticulous practice and dedication on the pro side of it that you'd (well, I'd) like to call it a sport. But if people reserve that for physical stuff, whatever... like you brought up NASCAR... but anyway...
@ the OP, it's semantics anyway. Doesn't matter.

Interesting post by leiph18. So football is a mixture of sport, game and contest. This seems doubtful. So what is NASCAR and Formula 1 and other motorsports? Ah! Sports.

I think the problem in defining chess as a sport is that calling it just a game somehow delineates it as less professional and more trivial. At least this is how it is with me. I don't like to refer to it as just a simple game when I have put so much work in trying to improve my play. For some reason chess is more than a game, at least to me.

If that's correct, then why isn't chess considered a sport?
That has nothing to do with tuna fish sandwich.
Try to follow the hot week in July.

For me, chess is an arguement. An exchange of ideas. And the pieces are our common language.
My train of thought during a game may be "So! You're telling me, you think your initiative will make up for that pawn you didn't bother to protect? Intetesting. What do you say, we test that hypothosis?"
So, what really is chess? Although there is no universally accepted difference between a game and a sport in the minds of most people, this can make for a raging debate.