D-ARTIST 501 & Tournament

When to Switch to 19 in Darts

Updated

The two triggers — and why the decision is always deliberate

Every serious 501 player switches from 20 to 19 at some point in a leg. What separates competitive players from casual ones is why they make the switch — and understanding both triggers is central to any complete 501 darts strategy. There are exactly two valid triggers. Understanding both — and being able to identify them before stepping to the oche — is one of the most important strategic skills in competitive 501.


The Two Triggers for Switching to 19 in 501

⚡ Trigger 1 — Drift When darts are consistently landing below the triple 20, grouping on 19 produces cleaner and more predictable results. If two or more darts in a visit drift below the triple 20 bed, that is a drift signal. Staying on 20 compounds the problem — switching to 19 stabilises the grouping and restores scoring rhythm. This trigger is mechanical.
📐 Trigger 2 — Mathematics When the current score would leave a bogey number if the single 20 is hit, switching to 19 keeps a clean three-dart checkout available. This trigger has nothing to do with how the darts are flying — it is a pure score-state decision. The switch is mandatory when the mathematics demand it, regardless of grouping quality. This trigger is strategic.
The key distinction: The drift trigger is about mechanics — you switch because staying on 20 is costing you scoring value. The mathematics trigger is about board position — you switch because staying on 20 risks leaving an unfinishable score. Both are valid. Both are deliberate. Neither is an emotional reaction to a bad dart.

Why 19 Is Structurally Safer Than 20 in Darts

The reason the 19 switch works — for both triggers — comes down to the neighbors of each segment. The dartboard has a fixed layout, and every segment's left and right neighbors are permanent. When a dart drifts, it almost always lands in one of those two neighbors.

20
Neighbors (clockwise order)
5 ← → 1
Both neighbors are weak. The 20 sits between the two lowest-value segments on the board. Any drift costs significant scoring value and can create an awkward checkout position.
19
Neighbors (clockwise order)
3 ← → 7
Both neighbors score higher than those of 20. A drift off treble 19 into 3 or 7 costs less and more often leaves a recoverable checkout position.

This neighbor comparison is why the 19 is not a fallback or a concession — it is a structurally stronger target for many scoring situations. The 20 has the weakest pair of neighbors on the board. That is a design fact, not an opinion.

For the full clockwise board order and a complete neighbor map for every number, see the miss geometry guide.


The 501 Mathematics Trigger — Scores That Demand the Switch to 19

The most important version of the switch-to-19 decision is the one that most players never fully learn: the mathematical trigger. Certain scores create a bogey number — a score impossible to finish in three darts — if the single 20 is hit during a scoring visit. When that risk exists, switching to 19 is not optional.

The seven bogey numbers are 169, 168, 166, 165, 163, 162, and 159. None of these can be finished in three darts. Landing on one costs at least one extra visit — and potentially the leg.

Your Score If Single 20 Hit — Leaves Problem Correct Action
281 261 Manageable — T20 → T20 next Stay on 20 — no issue
259 239 Manageable — but monitor next visit Stay on 20, watch the leave
220 200 Still finishable in two more visits Stay on 20
189 169 BOGEY — cannot finish in 3 darts Switch to 19 or adjust target
188 168 BOGEY — cannot finish in 3 darts Switch to 19 or adjust target
186 166 BOGEY — cannot finish in 3 darts Switch to 19 or adjust target
185 165 BOGEY — cannot finish in 3 darts Switch to 19 or adjust target
183 163 BOGEY — cannot finish in 3 darts Switch to 19 or adjust target
182 162 BOGEY — cannot finish in 3 darts Switch to 19 or adjust target
179 159 BOGEY — cannot finish in 3 darts Switch to 19 or adjust target
How to use this table: Before each scoring visit in the 180–290 range, mentally check — if I hit single 20, what do I leave? If the answer is a bogey number (169, 168, 166, 165, 163, 162, 159), switch to 19 before throwing. This takes two seconds of mental arithmetic and prevents the most common avoidable mistake in competitive 501.

When Switching to 19 in Darts Is Wrong

The switch is only correct when one of the two triggers is present. Switching for any other reason — frustration after a miss, imitation of a professional player's habit, superstition, or to "mix things up" — is not strategy. It is reaction.

If the darts are grouping well on 20 and the score creates no bogey risk, staying on 20 is correct. Treble 20 scores 60 and treble 19 scores 57. Over multiple visits, the three-point difference compounds. Players who switch unnecessarily give up scoring value without any structural benefit.

The same rule applies mid-visit. If the first dart of a visit lands in treble 20, the second dart should not switch to 19 unless the new score after the first dart creates a bogey risk on the next single. Most of the time, the correct play after a good first dart is to continue on 20 for the second.


Using 19 for 501 Checkout Setup

Beyond the two reactive triggers, the 19 is sometimes chosen proactively as a setup tool. Certain visit structures require a treble 19 to reach a specific finishing number cleanly. This is not switching away from 20 — it is choosing 19 as the correct first or second dart for a planned checkout route.

For example, on 129 remaining the preferred route is T19 → T16 → D12. The 19 is correct here not because of drift or bogey risk, but because 129 minus 57 equals 72 — a clean T16 → D12 finish. Starting on T20 produces 129 minus 60 equals 69, which forces a T19 → D6 finish — a less comfortable route for most players.

The D-Artist checkout tool shows the optimal first dart for every score and explains when 19 is the correct opening target for structural reasons rather than mechanical ones.


The Decision in Practice

In a match, the switch decision needs to be made before stepping to the oche — not during the throw. The process is straightforward: at the start of each visit, check the score. If a single 20 would leave a bogey, switch. If the last visit showed consistent drift below the treble, switch. Otherwise, stay on 20.

The decision should be calm and automatic. Players who hesitate between 20 and 19 at the oche — who are still making the decision as they step forward — introduce the same kind of mechanical disruption that pressure creates. The switch is a deliberate choice made in advance, then executed with full commitment.

The D-Artist rule: Make the target decision before stepping to the oche. Commit to it. Throw with the same mechanics regardless of which segment you chose. The switch solves a strategic problem — it should never create a mechanical one.

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