120 checkout
120 checks out in three darts under double out: T20, S20, D20, for 60 + 20 + 40. If the treble 20 lands in the single 20, 100 is left and still on: T20, D20. Should the third dart, at the double 20, drop into the single 20, 20 is left for the next visit: D10. With only two darts in hand, T20, S20 leave 40, so D20. Under straight out, where any segment can finish: T20, T20. Under master out, where a treble can finish: T20, T20.
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