139 checkout
139 checks out in three darts under double out: T20, T13, D20, for 60 + 39 + 40. If the treble 20 lands in the single 20, 119 is left, out of reach with two darts left: T20, S19 leave 40, so D20 on the next visit. Should the second dart, at the treble 13, drop into the single 13, 66 is left, out of reach with the last dart: T14 leaves 24, so D12 on the next visit. With only two darts in hand, T20, T13 leave 40, so D20. Under straight out, where any segment can finish: T20, T20, S19.
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.
With fewer darts in hand
The finish is then out of reach: these darts set up the next visit.
Under the other checkout rules
Neighbouring scores
Let DartSync work out your finish
In a game, the scoreboard shows the route every visit, following the checkout rule you chose.
Play a game of 501