The $1-million World Thoroughbred Championships Challenge will officially launch on Sept. 10. The promotion, an Internet- and e-mail-based sweepstakes to promote the Oct. 27 Breeders' Cup World Thoroughbred Championships at Belmont Park, offers participants the opportunity to win $1 million by correctly selecting the winners of all eight Breeders' Cup races. More than 100 additional prizes will be awarded to fans at other levels of game success, based on the number of winners they select.Registrants will receive a series of 10 customized e-mail messages about the Breeders' Cup World Thoroughbred Championships. The e-mails, to be written by Thoroughbred racing handicapper and commentator David Gutfreund, will include previews and recaps of key "Road to the World Thoroughbred Championships" races, as well as hotlinks to an online racing glossary, TV schedules and other pertinent information. Special, live chats featuring racing stars will also be held exclusively for Challenge participants.Fans may register at www.ntra.com or www.breederscup.com between now and Oct. 27. From Oct. 24 through 1:00 p.m. Oct. 27, they will have the opportunity to submit their Breeders' Cup World Thoroughbred Championships picks via the Internet.