Jim Knowles speaks to challenge of facing Notre Dame’s Audric Estime

Jim Knowles, Ohio State’s defensive coordinator, expects a tough test from Notre Dame running back Audric Estime on Saturday. “It’s the running back combined with the offensive line,” Knowles told reporters on Tuesday. “The offensive line is talented. The tackles are excellent, and he’s a strong running back.” The Buckeyes (3-0) allow 121.1 yards rushing per game and 3.5 yards…