forwards, three half-backs, one three-quarter and three full-backs. The player numbers were reduced to fifteen in 1877. Numbers were added to the backs of players' jerseys in the 1920s, initially as a way for coaches and selectors to rate individual players. Names of positions The various positions have changed names over time and many are known by different names in different countries. Players in the flanker positions were originally known as "wing forwards", while in the backs, "centre three-quarter" and "wing three-quarter" were used to describe the outside centre and wing respectively (although the terms are still sometimes used in the Northern Hemisphere) The names used by World Rugby tend to reflect Northern Hemisphere usage although fly-half is still often known as "outside-half" or "stand-off" in Britain, and "outhalf" in Ireland. In New Zealand, the scrum-half is still referred to as the "half-back", the fly-half is referred to as the "first five-eighth", the inside centre is called the "second five-eighth" and the outside centre is simply known as "centre". In America and Canada the number 8 is known as "8-man". Collective terms are also used to describe similar positions, with the props and hookers combining to form the "front row", the locks the "second row" and the flankers and number 8 the "back row", "loose forwards" or the "loosies". The front row and second row combined are collectively termed the "tight five". In the backs, "half-backs" can be used to describe the scrum-half and fly-half; "inside backs" to describe the scrum-half, fly-half and inside centre; "midfield" for the fly-half and both centres (in New Zealand it refers only to the second five-eighth and centre); and "outside backs" for the outside centre, wings and full-back. The two props are distinguished by being either a "tighthead" (their head is positioned between the opposition prop and hooker) or "loosehead" (their head is positioned on the outside of the scrum). The "blindside flanker" binds to the scrum on the side closest to the side line, while the "openside flanker" binds on the side with the most space between the scrum and the sideline. Backs Full-back Full-backs usually position themselves several metres behind the back line. They field any deep opposition kicks and are often the last line of defence should an opponent break through the back line. On attack, they can enter the back line, usually near the centres or wings, with the aim