The Carolinas Challenge was mostly a UNC thing set up between Hatchell and promoters of the local Beach Ball Classic tournament for boys and girls prep basketball. Hatchell pretty much took her Tarheels team to participate in the tournament every season she was head coach, with the last year being during the 2018-19 season, which was Hatchell's last season in Chapel Hill. They played against Rice and then Auburn, where they lost in overtime 86-81 (UNC went 18-15 in Hatchell's final season).
South Carolina only has a 1-3 record in the Carolinas Challenge tournament versus UNC. We played in the tournament five times, from 2009-10 through 2011-12 - all versus UNC - again in 2013-14 also versus UNC, and then one more time in 2015-16 against East Carolina. Hatchell may have dropped playing against us once we got good, but our last game against them in the tournament they beat us.
After Hatchell was fired from UNC, I don't think the tournament has been held anymore. But there is more connections in the Myrtle Beach area that supports North Carolina universities and athletic functions, than supports anything having to do with the University of South Carolina, unfortunately. Horry County is a county that borders the Atlantic Ocean, as well as the state border of North Carolina, so an awful lot of influence from the state up there, down here.......