We’ve chosen a chain link symbol to denote this position, because the inside-centre (12) and outside-centre (13) work in unison. Between them they encompass many different qualities, and an outstanding 12 could be ineffective at 13 and vice versa. The 12 might be a bludgeon who crashes the ball up, or equally might act as a ‘second fly-half’, with kicking skills and immaculate passing distribution. At 13, you must have more pace, preferably the sort to take you arcing round your marker to create a two-on-one, and both players should be defensively impeccable.