How the checkout calculator works
Ocheflow searches for valid routes that finish on a double or the inner bull. The preferred route follows a curated standard checkout chart. Valid alternatives are generated separately, because players may favour different doubles or miss patterns.
What is a darts checkout?
A checkout is the final visit of an X01 leg. In the common double-out format, the final dart must hit a double. The inner bull scores 50 and counts as double 25.
Bogey numbers
The scores 169, 168, 166, 165, 163, 162 and 159 cannot be finished in three darts under standard double-out rules. The calculator identifies these scores automatically.
The preferred route is T20 · T11 · D14. Other mathematically valid routes may appear as alternatives, but the preferred route follows the curated Ocheflow chart.
Checkout route tips
- Choose routes that leave a comfortable double after a missed first dart.
- Learn common finishes from 40 down before memorising larger combinations.
- Remember that checkout routes are suggestions, not mandatory sequences.
- Use the full chart to practise and compare scores from 2 to 170.
Frequently asked questions
Does the calculator use double-out?
Yes. Every route finishes on a double or the inner bull.
Why can two players choose different routes?
Multiple routes can be mathematically valid. Preference often depends on favourite doubles and the backup leave after a missed dart.
Can 170 be checked out?
Yes. The only 170 route is T20 · T20 · Bull.
Why is 169 unavailable?
There is no combination of three legal dart scores that totals 169 while finishing on a double.