US Legal, Online Horse Racing Betting & Greyhound Racing Wagering. Get Cash Rewards, Live Horse Racing Video, Race Results & Replays. Horse Racing · Mobile Horse Betting · Join OTB · OTB Customer Support. The newest Winner's Circle Off Track Betting facility in Clarksville provides guests comfortable accommodations with numerous personal monitors, multi-track. Want to place a bet, and can't make it to the track? Check out our Simulcast Facilities throughout Washington, including our newest one at the Muckleshoot.