What Is the Difference Between a Leg and a Set?
A Single Leg
A single standalone game of 501. Players alternate visits until one hits a double to reach exactly zero. Winning a leg gives a player 1 point toward winning the active set.
A Set
A mini-match within the contest. A set is played over the best of 5 legs. The first player to win 3 legs wins the set. The set score resets to 0–0 for the next set.
World Championship Round Distances
As the tournament progresses from the opening round in mid-December to the final on 3 January, match lengths increase substantially, demanding greater physical stamina and mental focus:
| Tournament Round | Match Format | Sets Needed to Win | Maximum Sets Possible |
|---|---|---|---|
| Round One | Best of 5 sets | First to 3 sets | 5 |
| Round Two | Best of 5 sets | First to 3 sets | 5 |
| Round Three | Best of 7 sets | First to 4 sets | 7 |
| Round Four | Best of 7 sets | First to 4 sets | 7 |
| Quarter-Finals | Best of 9 sets | First to 5 sets | 9 |
| Semi-Finals | Best of 11 sets | First to 6 sets | 11 |
| Final | Best of 13 sets | First to 7 sets | 13 |
Every match requires a player to win the majority of scheduled sets. For example, in a "Best of 13 sets" final, the first player to reach 7 sets is crowned World Champion.
The Deciding Set Tiebreak & Sudden Death Rule
In normal sets throughout the match, a set is won as soon as a player leads 3–0, 3–1, or 3–2. However, when a match reaches its final deciding set (e.g., 2–2 in Round 1 or 6–6 in the Final), the DRA rules enforce a strict tiebreak to prevent a lucky throw from deciding the contest:
Two Clear Legs Rule
In the final set, a player must win by two clear legs (e.g., 3–1, 4–2, 5–3, 6–4). Play continues beyond 3–2 until one player breaks throw and holds to establish a two-leg cushion.
The 5–5 Cutoff Limit
To prevent matches from continuing indefinitely, the two-clear-legs rule caps out at 5–5 in legs (a total of 10 legs played in the deciding set).
The Sudden-Death 11th Leg
If the deciding set reaches 5–5, an 11th sudden-death leg is played. The winner of this single leg wins the entire match!
Crucial Rule: Before this 11th leg begins, players throw at the bullseye backstage (or on stage) to determine who throws first in the deciding leg. The advantage of throwing first in a sudden-death leg is enormous.
Why Set Play Changes Match Strategy
In straight-leg tournaments like the World Matchplay or Premier League, every leg won counts equally toward a single running tally. In set play, the psychology is radically different:
1. The "Reset" Dynamic
If a player suffers a demoralizing 0–3 loss in a set, the slate is wiped clean for the next set. Winning 3–2 in legs awards the exact same set point as winning 3–0. A player can be comprehensively outplayed for 10 minutes and immediately recover.
2. Breaks of Throw Are Magnified
Because each set is short (first to 3 legs), an early break of throw in Leg 1 or Leg 2 almost guarantees the set. In straight-legs play, an early break can easily be recovered over 18 legs. In set play, a momentary lapse of concentration surrenders an entire set.
3. How a Player Can Win Fewer Legs but Win the Match
It is statistically possible for a player to win fewer total legs than their opponent across a match and still win the contest! For example, Player A wins sets 3–2, 3–2, and 3–2 (9 legs won, 6 legs lost). If Player B won two sets 3–0 and 3–0, Player B actually won 12 legs while Player A only won 9—yet Player A wins the match 3–2 in sets!