The official betting tournament of the 'Run for the Roses'--the Kentucky Derby Betting Challenge (KDBC)--is returning to TwinSpires.com with a guaranteed prize pool of $250,000, Churchill Downs said in a presser on Thursday. The first official KDBC Qualifier Tournament will take place on Sunday, Oct. 27 featuring the opening day card of the fall meet at Churchill Downs and a series of feeder tournaments will begin on Saturday, Oct. 12. Leading up to the Kentucky Derby Day program, the schedule will include 24 KDBC qualifier events, with each qualifier supported...