Treble portion value Single portion value Quadruple portion value Double portion value
50 75 100 25
4 5 3 2
9 8 11 10
American Darts Association British Darts Organisation World Darts Federation World Darts Council
7 feet 9.25 inches 5 feet 8 feet 6 feet
Triple score Double or bull shot Exact score Double only
First 9 dart finish Inventing the numbering system Inventing Dartboard Establishing BDO