The average professional PDC darts player, who has an 8% probability of hitting a 180 while aiming for the treble 20 bed, and just a 3% chance of landing a 141 checkout, should expect to score a nine-dart finish once in every 5,000 legs. So, the answer to this question is that nine-dart finishes are definitely not common. In fact, since 1999, there have been 344 nine-dart finishes, which might sound like a lot at first, but you have got to take into consideration how many legs of darts are thrown at professional tournaments each year. The fact that a nine-dart finish is so rare can be seen from the odds that bookies offer for it to happen.