CHAPEL HILL, N.C. — Amid all the tributes to Dean Smith since the coaching legend's death, North Carolina coach Roy Williams and his No. 15 Tar Heels saved possibly the most fitting one for Saturday. With Williams and players on the bench holding up four fingers, his team ran the "Four Corners" offense Smith made famous while coaching here and scored on their first possession — a sign of how smoothly things would run in an 89-60 rout of Georgia Tech.