There are no cash prizes for the winners of the World Championship Bar-B-Que Contest at the Houston Livestock Show and Rodeo. "Competition barbecue has grown over the years and in some cases you're seeing some contests where prize money has grown," said George "Tuffy" Stone, pitmaster for the hot Cool Smoke BBQ team from Virginia (in the Champions Corner at the Houston cookoff). The 42nd annual cookoff on Saturday is among a handful of the most prestigious competitions in the smoky realm of competitive barbecue.