Sept. 10, 1961 - When Johnny Unitas is at his best, he is practically unbeatable. And when the defense opposing the excellent Baltimore Colt quarterback is ineffective, it's an added boon for the Colts. Such was the situation today at the Yale Bowl. Unitas picked the New York Giants' defense apart and led the Colts to a 49-20 victory in the Albie Booth Memorial Game. It was the final preseason exhibition game for each of the NFL clubs. To add to the Giants' problems, their leading quarterback, Charlie Conerly, was injured early in the first period with a possible nose fracture. Y.A. Tittle, their backup quarterback, was out of action because of a sore back muscle.