There is speculation that the game originated among soldiers throwing short arrows at the bottom of the cask or at the bottom of trunks of trees. As the wood dried, cracks would develop, creating "sections". Soon, regional standards emerged and many woodworkers supplemented bar tabs by fabricating dart boards for the local pubs.
The standard numbering plan with a 20 on top was created in 1896 by a Lancashire[4] However, a great many other configurations have been used throughout the years and in different geographical locations. Gamlin's layout was devised to penalise inaccuracy. Although this applies to most of the board, the left-hand side (near the 14 section) is preferred by beginners, for its concentration of larger numbers. Mathematically, removing the rotational symmetry by placing the "20" at the top, there are 19!, or 121,645,100,408,832,000 possible dartboards. Many different layouts would penalise a player more than the current setup; however, the current setup actually does the job rather efficiently. There have been several mathematical papers published that consider the "optimal" dartboard. carpenter called Brian Gamlin.
Height and distance
In the standard game, the dartboard is hung so that the bullseye is 5 ft 8 in (or 173 cm) from the floor—eye-level for a six-foot (183 cm) person. The oche (IPA: /'ɒki/)—the line behind which the throwing player must stand—is generally 7 ft 9¼ in (or 237 cm) from the face of the dartboard measured horizontally. This is the recognized world standard as set by the World Dart Federation and is used in most areas.
The London 5 board or narrow 5's board set up is slightly different from the standard board. The height is set at 5 feet 6 inches to the centre of the bull and the oche is at 9 feet from the face of the board.
(Info from: http://en.wikipedia.org/wiki/Darts and http://www.cyberdarts.com/basics/dartsbasics.html)
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