Assuming standard scoring, the optimal area to aim for on the dart board in order to maximize the player's score varies significantly based on the players skill. The skilled player should aim for the centre of the T20 and as the player's skill reduces their aim moves slightly up and to the left of the T20. At σ = 16.4 the best place to aim jumps to the T19. As the player's skill decreases further, the best place to aim curls into the centre of the board, stopping a bit lower than and to the left of the bullseye at σ = 100

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The standard dartboard is divided into 20 numbered sections, scoring from 1 to 20 points, by wires running from the small central circle to the outer circular wire. Circular wires within the outer wire subdivide each section into single, double and triple areas. The dartboard featured on the "Indoor League" television show of the 1970s did not feature a triple section, and according to host Fred Trueman during the first episode, this is the traditional Yorkshire board.

Various games can be played (and still are played informally) using the standard dartboard. However, in the official game, any dart landing inside the outer wire scores as follows:

Hitting one of the large portions of each of the numbered sections, traditionally alternately coloured black and white, scores the points value of that section.
Hitting the thin inner portions of these sections, roughly halfway between the outer wire and the central circle coloured red or green, scores triple the points value of that section.
Hitting the thin outer portions of these sections, again coloured red or green, scores double the points value of that section. The double-20 is often referred to as double-top, reflecting the 20's position on the dartboard.
The central circle is divided into a green outer ring worth 25 points (known as "outer", "outer bull", or "iris") and a red or black inner circle (usually known as "bull", "inner bull" or "double bull"), worth 50 points. The term "bullseye" can mean either the whole central part of the board or just the inner red/black section. The term "bull's ring" usually means just the green outer ring. The inner bull counts as a double when doubling in or out.
Hitting outside the outer wire scores nothing.
Any dart that does not remain in the board until it is collected by the player (for example, a dart that hits a wire and bounces out of the board or drops out with the impact of a later throw) also scores nothing; exception should be noted if play is on any electronic board: darts falling out are counted.
A dart only scores if its point is embedded in or is touching the playing surface. A dart that hits the board side on or at an angle but does not fall off because it is held in place by two other darts, for example, will score either equal to where its point touches or not at all.
The highest score possible with three darts is 180, commonly known as a "ton 80" (100 points is called a ton), obtained when all three darts land in the triple 20. In the televised game, the referee frequently announces a score of 180 in exuberant style. A "quad" ring appeared briefly between the triple ring and the bull in the 1990s, leading to a potential 240 maximum (three quad-20s), a 210 maximum checkout (Q20-Q20-Bull) and seven dart finishes from a 501 start (five quad-20s, triple-17, bullseye), but was swiftly dropped from professional tournament play.

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Initially the missiles were simply cut down arrows or crossbow bolts.The first purpose made darts were manufactured in one piece from wood; wrapped with a strip of lead for weight and fitted with flights made from split turkey feathers. These darts were mainly imported from France and became known as French darts. Metal barrels were patented in 1906 but wood continued to be used into the 1950s. The first metal barrels were made from brass which was relatively cheap and easy to work.[9] The wooden shafts, which were now threaded to fit the tapped barrel, were either fletched as before or designed to take a paper flight. This type of dart continued to be used into the 1970s.[9] When the advantages of using plastic were realised, the shaft and flight became separate entities, although one piece moulded plastic shaft and flights were also available.

Modern darts have four parts: The points, the barrels, the shafts and the fletching[12] The steel points come in 2 common lengths, 32mm and 41mm and are sometimes knurled or coated to improve grip. Others are designed to retract slightly on impact to lessen the chance of bouncing out.

The barrels come in a variety of weights and are usually constructed from brass, silver-nickel, or a tungsten alloy. Brass is cheap but light and therefore brass barrels tend to be very bulky. Tungsten on the other hand, is twice as dense as brass thus a barrel of an equivalent weight could be thirty percent smaller in diameter. Tungsten is very brittle however and so an alloy of between 80 and 95 per cent tungsten is used. The remainder is usually nickel, iron, or copper. Silver-nickel darts offer a compromise between density and cost.

Barrels come in 3 basic shapes: Cylindrical, torpedo, or ton. Cylindrical barrels are the same diameter along their entire length and so tend to be long and thin. Their slenderness makes them better for grouping but because they are long, the centre of gravity is further back. Ton shaped barrels are thin at either end but bulge in the middle. This makes them fatter than a cylindrical barrel of equivalent weight but the centre of gravity is further forward and so theoretically easier to throw. Torpedo shaped barrels are widest at the point end and taper towards the rear. This keeps the weight as far forward as possible but like the ton, gives it a larger diameter than the cylinder.

The shafts are manufactured in various lengths and some are designed to be cut to length. Shafts are generally made from plastics, nylon polymers, or metals such as aluminium and titanium; and can be rigid or flexible. Longer shafts provide greater stability and allow a reduction in flight size which in turn can lead to closer grouping; but they also shift the weight towards the rear causing the dart to tilt backwards during flight,requiring a harder,faster throw. A longer shaft will however make the dart less responsive and increase the chance of "wobbling".

The primary purpose of the flight is to produce drag and thus prevent the rear of the dart overtaking the point. It also has an effect on stability by reducing wobble. Modern flights are generally made from plastic, nylon, or foil and are available in a range of shapes and sizes. The three most common shapes in order of size are the standard, the kite, and the smaller pear shape. The less surface area, the less stability but larger flights hamper close grouping. Some manufactures have sought to solve this by making a flight long and thin but this in turn creates other problems such as changing the dart's centre of gravity. Generally speaking a heavier dart will require a larger flight.

The choice of barrel, shaft, and flight will depend a great deal on the individual player’s throwing style. For competitive purposes a dart cannot weigh more than 50g including the shaft and flight and cannot exceed a total length of 300mm.

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The dartboard may have its origins in the cross-section of a tree. An old name for a dartboard is "butt"; the word comes from the French word but, meaning "target".In particular, the Yorkshire and Manchester Log End boards differ from the standard board in that they have no treble, only double and bullseye, the Manchester board being of a smaller diameter, with a playing area of only 25 cm across with double and bull areas measuring just 4mm. The London Fives board is another variation. This has only 12 equal segments numbered 20, 5, 15, 10, 20, 5, 15, 10, 20, 5, 15, 10 with the doubles and triples being a quarter of an inch wide.

There is a 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 Lancashire carpenter Brian Gamlin. 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.

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Darts were historically used in warfare in ancient history; skirmishers used darts of varying sizes, similar to miniature javelins. It was the practice of this skill that developed into a game of skill. Before the First World War, pubs in the United Kingdom had dartboards made from solid blocks of wood, usually elm.[citation needed] They had to be soaked overnight to heal the holes made by the darts, and it was a messy business for the publican, although darts was a popular game. This changed when a company called Nodor, whose primary business was making modelling clay (which has no odour, hence the name Nodor), started producing clay dartboards in 1923. The clay dartboards never caught on, and Nodor switched to making the traditional elm dartboards that were popular at the time. Their model of dartboard was not a great success until someone came up with the idea of using the century plant to make a dartboard. Small bundles of sisal fibres of the same length were bundled together. The bundles were then compressed into a disk and bound with a metal ring. It was an instant success, as the darts did little or no damage to the board—they just parted the fibres when they entered the board; this type of board was more durable and required little maintenance.

Quality dartboards are made of sisal fibres; less expensive boards are sometimes made of cork or coiled paper. However, several types of sisal fibre are used in dartboards today, originating from East Africa, Brazil, or China. The widespread belief that some dartboards are constructed using pig bristles, camel hair, or horse hair, is incorrect. Apparently no such boards have ever been produced commercially.

A regulation board is 17 3?4 inches (451 mm) in diameter and is divided into 20 radial sections. Each section is separated with metal wire or a thin band of sheet metal. The best dartboards have the thinnest wire, so that the darts have less chance of hitting a wire and bouncing out. The numbers indicating the various scoring sections of the board are also normally made of wire, especially on tournament-quality boards. The wire ring on which the numbers are welded can be turned to facilitate even wear of the board. Boards of lesser quality often have the numbers printed directly on the board.

Recently, some companies have produced electronic dartboards. These dartboards have electronic scoring computers that are preprogrammed with a wide variety of game types. The board is made of plastic facings with small holes. The holes slant out, allowing the plastic-tipped darts to stick inside. When a dart strikes the board, the section makes contact with a metal plate, telling the computer where the player has thrown.

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There are many games that can be played on a dartboard, but darts generally refers to a game whereby the player throws three darts per visit to the board with the goal of reducing a fixed score, commonly 501 or 301, to zero ("checking out"), with the final dart landing in either the bullseye or a double segment. A game of darts is generally contested between two players, who take turns. Each turn consists of throwing three darts. When two teams play, the starting score is sometimes increased to '701' or even '1001'; the rules remain the same.

A throw that reduces a player's score below zero, to exactly one, or to zero but not ending with a double is known as "going bust", with the player's score being reset to the value prior to starting the turn, and the remainder of the turn being forfeited. A darts match is played over a fixed number of games, known as legs. A match may be divided into sets, with each set being contested as over a fixed number of legs.

Although playing straight down from 501 is standard in darts, sometimes a double must be hit to begin scoring, known as "doubling in", with all darts thrown before hitting a double not being counted. The PDC's World Grand Prix uses this format.

The minimum number of thrown darts required to complete a leg of 501 is nine. The most common nine dart finish consists of two 180 maximums followed by a 141 checkout (T20-T19-D12), but there are many other possible ways of achieving the feat. Three 167s (T20-T19-Bull) is considered a pure or perfect nine dart finish by some players.

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Each player throws three darts in each inning. If the player hits the thin outer ring on the number that coincides with the inning, that player gets two runs. If a player hits the thin inner ring (not the bull's-eye) inside the inning number, that player gets three runs. If a player hits anywhere else on the board but the bull's-eye in the inning number, that player gets one run. If the score is tied after nine innings and extra innings are needed, each player tries to hit the bull's-eye. The player to hit a bull's-eye in extra innings wins.

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1.Every two weeks, remove the metal number ring from your dartboard.

2.Move the "20" through to the next blank segment. The "20" now becomes the "12," and so on.

3.Repeat the procedure more often or less often as use and wear dictate.

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Nickel/Tungsten darts are made of a high-tech material composed of Tungsten particles bound together with Nickel. They are more dense than Brass or Nickel/Silver darts. This means smaller diameter barrel, better "feel", and tighter possible groups on the dartboard. Tungsten is also a very durable material, and the machined grip will not wear down as quickly as on Brass or Nickel/Silver darts.

Discount outlets and other online stores often sell low-density Tungsten darts without specifying the percentage of Tungsten content, but just say "Tungsten darts". Such darts are often cheap imports and are not very good quality. Look for the percentage of tungsten - a higher number means that the darts are more dense, and generally better quality.

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Number of Players: Any number can play, but Killer is most fun with three or more players.

Numbers in Play: The numbers used are determined by the players.  Each player throws one dart with the "opposite" hand.  (e.g., right-handers throw left-handed) to determine randomly his or her own number.  If a player misses the dartboard or hits a number already taken, he or she throws again.

Rules of the Game:  Each player first tries to hit the double of his or her own number.  When this is acheived, the player is known as a "killer" and a K is placed after his name on the scoreboard.  After becoming a killer, a player begins aiming for the doubles of opponents' numbers.  Each player has three lives and whenever a killer hits an opponents' double the opponent loses one of his lives.  If a killer hits his or her own double by mistake, the killer loses one live; it is therefore possible to kill yourself by accident. it is also possible to kill an opponent in one exceptional three dart turn by throwing three doubles.  The game progresses until only one person has any lives left.

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