Rugby union and rugby league share a common ancestry and look similar at a glance, which leads many newcomers to assume they're the same sport with different names. In reality, the two codes diverged over a century ago and now operate under meaningfully different rulebooks. This article explains the concepts they share, the structural rules that set them apart, and how scoring differs between the two.
Shared Foundations
Despite their differences, union and league both evolved from the same original game, and several core concepts carry over directly between them. Understanding these shared elements first makes the differences easier to appreciate.
- The try: In both codes, the primary method of scoring involves grounding the ball in the opposing team's goal area, known as the try zone or in-goal area. A try is the foundation of attacking play in both sports.
- Tackling: Both games are built around tackling the ball carrier to stop their progress, and both have rules governing what constitutes a legal tackle, generally requiring the tackler to use their arms to wrap and bring the ball carrier to ground rather than simply obstructing or striking them.
- The forward pass rule: In both union and league, a player may not pass the ball forward toward the opposing goal line; the ball can only be passed sideways or backward relative to the direction of attack. Players can run forward with the ball freely, but a teammate can't throw it ahead of them. This rule shapes the entire attacking structure of both codes, forcing teams to advance through running and kicking rather than forward passing, unlike sports such as American football.
- Kicking plays a significant tactical role in both games, used both to gain territory and to score points, though the specific kicking rules and their relative importance differ between the codes.
Team Size and Why It Matters
One of the most visible differences is squad size on the field. Rugby union fields fifteen players per side, while rugby league fields thirteen. This numerical difference isn't arbitrary; it directly shapes how each game is played. With fifteen players, union has room for a more specialized forward pack and a slower, more territorial style built around contesting possession at rucks and mauls. League's thirteen-player sides, with two fewer forwards, tend to produce a faster, more open style of play with more space on the field relative to the number of players.
Rucks, Mauls, and Contested Possession in Union
Rugby union includes two phases of play that don't exist in league: the ruck and the maul. A ruck forms when the ball carrier is tackled and goes to ground, and players from both teams bind together over the ball, using their feet to try to win or retain possession. A maul occurs when the ball carrier is held up but not brought to ground, and teammates bind onto them to drive forward while opposing players try to stop the advance and contest the ball. These phases mean possession in union is genuinely contestable after almost every tackle; either team can come away with the ball depending on who wins the physical battle at the breakdown. This contestability is a defining feature of union's structure and a major reason the pace of play is generally slower and more stop-start than league.
The Six-Tackle Rule and Play-the-Ball in League
Rugby league takes a fundamentally different approach to possession after a tackle. Instead of contesting the ball at a ruck, the tackled player's team retains possession and restarts play through what's called the play-the-ball: the tackled player gets up, places the ball on the ground, and rolls it backward with their foot to a teammate, who then continues the attack. Because possession isn't contested in the way it is in union, league introduces a tackle-count system instead: an attacking team gets six tackles to advance the ball and attempt to score, and if they haven't scored or lost the ball through an error by the sixth tackle, possession transfers to the other team. This six-tackle structure is arguably the single biggest rule difference between the codes, and it's what gives league its characteristic rhythm of structured attacking sets followed by a handover of possession, similar in spirit to the down-and-distance system in American football, though mechanically distinct.
Scrums: Shared Concept, Different Scale
Both codes use scrums to restart play after certain infringements, but the scale and purpose differ. Union scrums involve eight forwards per team binding together in a structured formation, and winning the ball at a scrum is a genuinely contested and tactically significant event, often involving considerable pushing power between the two packs. League scrums involve only six players per team and are a far less significant contest for possession in the modern game, functioning more as a formality to restart play than a genuine battle for the ball, since the attacking team retains the put-in and possession in the vast majority of cases.
Scoring Differences
Both codes award points for tries, conversions, and penalty or drop goals, but the point values differ between them:
- In union, a try is worth five points, a conversion kicked after a try is worth two points, a penalty kick is worth three points, and a drop goal is worth three points.
- In league, a try is worth four points, a conversion is worth two points, a penalty kick is worth two points, and a drop goal (called a field goal in some competitions) is worth one point.
These differing values reflect each code's relative emphasis: union's higher penalty and drop goal values make kicking for points a more prominent tactical option, while league's structure places comparatively more emphasis on building attacking sets to cross the try line.
Quick Recap
- Both codes share tries, tackling, and a strict no-forward-pass rule as core foundations.
- Union uses fifteen players per side; league uses thirteen, producing a faster, more open style.
- Union contests possession after tackles through rucks and mauls; league retains possession via the play-the-ball.
- League's six-tackle rule forces a handover of possession if a team fails to score or err within six tackles.
- Union scrums involve eight forwards and are a significant contest; league scrums use six players and are largely a formality.
- Scoring values differ: union tries are worth five points with three-point penalties and drop goals, while league tries are worth four points with two-point penalties and one-point drop goals.