Must we live up to the cliche that all gamers are sweaty, unwashed weirdos by making the first piece of advice: "have a shower"? Seriously, who goes out to spend the whole day with other people without undertaking proper personal hygiene first?
Magic the Gathering players
*shudders*
To be fair, the nose is quite adept at ignoring one's own funk, so I can see how some people get to the point of reeking without noticing or caring.
I mean, you ever encounter a smoker who smells so bad you can taste the tobacco in the air around them?
And most GS's I've been to haven't been exactly the most climate controlled areas in human existence.
You'd be surprised how many people leave a reeking trail of sweatfumes. *shudder
But showering beforehand also freshens your mind, especially if the tournament is in the afternoon or evening after a day at work.