The quarterback can be accompanied by an offensive lineman to block for him, or run without a blocker, which is known as a naked bootleg or waggle. More complex versions involve multiple offensive linemen moving with the quarterback to block and multiple false hand offs; one such variation is known as a rollout. After escaping the area behind the offensive line, the quarterback may either throw a pass downfield or run with the ball himself to gain yardage. Frankie Albert, an All-American quarterback at Stanford University, is given credit for inventing the bootleg play in 1940.