Carioca, also known as Campeonato Carioca, is a professional football tournament in Brazil for men. There are overall 17 teams that typically compete in a period between January and April.
There are two sides to every bet; someone betting on an outcome to happen (a back bet), and someone on the other side betting for an outcome not to happen (a lay bet). Typically, bookmakers represent the lay side, so they offer customers odds that they are willing to lay.