Red Auerbach's last book, written with Feinstein, had a story about the old Celtics and their six or so basic plays. Everyone in the league knew them cold, so Red decided to go to a different system for calling the plays. The Celtics, it turns out, were totally confused by the new system, so they went back to the old system where the opponents knew what was coming -- and they still couldn't stop the Celtics.
sagegrouse