Comparison of Canadian football and rugby union points in union and only one in league). The key difference between a field goal and a drop goal is that a field goal attempt is normally kicked with a teammate holding the ball, whereas in rugby the ball must hit the ground and be kicked from a half-volley. A similar concept in rugby is the penalty goal. Following the award of the penalty, the attacking team may opt to kick for goal rather than advance the ball by hand or punting. This scores 3 points. The penalty goal is similar to a field goal in Canadian football in that
Goal difference Goal difference Goal difference or points difference is a form of tiebreaker used to rank sport teams which finish on equal points in a league competition. Either "goal difference" or "points difference" is used, depending on whether matches are scored by goals (as in ice hockey and association football) or by points (as in rugby union and basketball). Goal difference (or points difference) is calculated as the number of goals (or points) scored in all league matches minus the number of goals or points conceded. Goal difference was first introduced as a tiebreaker in association football, at the 1970 FIFA