Semifinals action opens this afternoon at Cheyenne Frontier Days, and a pair of former Central Rocky Mountain Region college student-athletes advanced by winning the day team roping on July 27 in the big Frontier Park arena. Cooper White competed for the Gillette College Pronghorns while brother Tucker was a Lamar Community College ‘Runnin Lope. Cheyenne can turn around a year for cowboys and cowgirls trying to make the national finals. The Whites will be out today, shooting for a spot in the championship round on July 30.