What is 9 darts???

9 darts is the erliest way to finish 501 game!
This means perfect game of 501!
(ex)501=triple20*3+triple20*+triple20+triple19+double12  (just 3 round!!)

In a big championship, sometimes there are prize for people who achieve 9 darts,
in addition to the 1st-3rd prize!