Each player is assigned a numbered position with certain responsibilities. Number One is usually the weakest player on the team, though the position is one of the most difficult to play. Number One is theoretically responsible for scoring goals and covering the opposing Number Four (defensive player).
Number Two plays an important role in offence, either running through and scoring themselves, or passing to Number One and getting in behind them. Defensively, they will cover the opposing team’s Number Three, generally the other team’s best player.
Number Three is the tactical leader and must be a powerful hitter to feed balls up to Number One and Number Two, whilst also helping to maintain a solid defense. Number Three is often the best player on the team.
Number Four is primarily a defensive player, who may move anywhere on the field, but mainly functions to prevent scoring.