The power forward (PF), also known as the four or strong forward, is a position in basketball. Power forwards play a role similar to centers. When on offense, they typically play with their backs towards the basket. When on defense, they typically position themselves under the basket in a zone defense or against the opposing power forward in man-to-man defense. The power forward position entails a variety of responsibilities, one of which is rebounding. Many power forwards are noted for their mid-range jump-shot, and several players have become very accurate from 12 to 18 feet (3.7 to 5.5 m). Earlier, these skills were more typically exhibited in the European style of play. Some power forwards, known as stretch fours, have since extended their shooting range to three-point field goals.