166 Checkout? Not Possible
166 is a bogey number: there is no three-dart double-out finish for it. The bogey numbers under 171 are 159, 162, 163, 165, 166, 168, 169.
Why 166 can't be checked out
A double-out finish ends on a double — at most D20 (40) or the bullseye (50). So the first two darts would need to score 116 before the bull, or 126 before D20. 126 is more than the 120 two darts can score at most (T20 T20), and 116 can't be scored with two darts — the closest two-dart totals are 120, 117, 114, 111. Every lower double needs even more from the first two darts, so there's no way out.
The highest finishes that do exist are 170, 167, 164, 161, 160, 158, 157, 156.
What to throw instead
Since you can't finish this visit, score as much as you can and leave a one-dart double for next time. T20, T20, S14 leaves 32, so your next visit starts on D16.
Quick facts
- Double-out checkout: none
- Best setup: T20, T20, S14 → 32 left
166 left in a real game?
Score your next leg in the free ChillDarts scorer — it shows the suggested checkout live as you throw, dart by dart. No sign-up, works on your phone.
Nearby checkouts
See every finish from 170 down to 2 on the checkout chart & calculator.