Would this be done by posting moves (Q4 > K2) or would you use a 3rd party program like Yahoo Chess?
I was thinking with a 3rd party program. 3 come to mind, though I know there's gotta be more.
Yahoo Chess: Only need a free account to play, no downloads except java which most people should already have.
Arcadia's Syn-Chess: Arcadia is a game which you have to download (for free) which contains a variety of games called Toys, one of which being chess. It lets multiple tables be set up so multiple games can be played at once without a bunch of screens floating around.
Ijji's chess proggy: ijji.com has some sort of chess game, but I've never played it so idk how it works.
Problem with the Tai prize is that if an international tourney is done, not just within Taijitu, not everyone is going to be registered here.