Chicago's "stonewall infield". He became known as a strong defensive player who could make difficult throws from his back or his knees. Pfeffer was one of the last players who refused to wear a baseball glove. When the opposition attempted a stolen base, he was the first major-league infielder to cut off throws from the catcher and return the ball to home plate to avoid the double steal.

Pfeffer was often among the league leaders in errors, but these totals were influenced by the fact that