149 checkout
In short
149 checks out in three darts under double out: T20, T19, D16, for 60 + 57 + 32. If the treble 20 lands in the single 20, 129 is left, out of reach with two darts left: T20, T15 leave 24, so D12 on the next visit. Should the second dart, at the treble 19, drop into the single 19, 70 is left, out of reach with the last dart: T10 leaves 40, so D20 on the next visit. With only two darts in hand, T20, T19 leave 32, so D16.
T20
60
T19
57
D16
32
When a dart strays
A missed treble or double often drops into the single of the same segment, and a missed bull into the 25 around it. Here is what that leaves, and what comes next.
treble 20 → single 20
129 left, set up 24, so D12 on the next visit
T20
60
T15
45
treble 19 → single 19
70 left, set up 40, so D20 on the next visit
T10
30
double 16 → single 16
16 left, on the next visit
D8
16
With fewer darts in hand
The finish is then out of reach: these darts set up the next visit.
Two darts
leaves 32, so D16
T20
60
T19
57
Under the other checkout rules
Master out
finish on a double or a treble
Same route as under double out
Straight out
any segment can finish
Same route as under double out
Neighbouring scores
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