betsuperior enters the sbr rating guide at d . BetSuperior is a new sportsbook from the Costa Rica-based operation that formerly ran BlueGrass Sports (BetBG.com). Superior is the only post-up sportsbook from the Bluegrass Group. BetSuperior is not to be confused with defunct Superiorbook which was bailed out by Bookmaker (SBR rating A+) in August of 2007. SBR will monitor BetSuperior and analyze all available player feedback.