Usually in professional darts, a leg starts off with both players on 501 points. Players take it in turns to score points, with the total score from each visit of their three darts being ...

Similarly, 19 is penalised by inaccurate throws landing in the neighbouring arcs scoring three ... by the fact that the rules of the 501-down game require that the last dart thrown must hit ...

Darts fans have been left puzzled by the unique scoring system used in the sport, with the starting score of 501 often ...