Dominoes

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"Domino" redirects here. For other uses, see Domino (disambiguation).

This article is about dominoes in general. For specific games, see Category:Domino games.

A game of Dominoes

Dominoes (or "dominos") generally refers to the individual or collective gaming pieces making up a domino set (sometimes called a deck or pack) or to the games played with these pieces. (In the area of mathematical tilings and polyominoes the word domino often refers to any rectangle formed from joining two squares edge to edge.) Standard domino sets consist of 42 pieces called bones, cards, tiles, stones, spinners or dominoes. Each bone is a rectangular tile with a line dividing its face into two square ends. Each end is marked with a number of black spots (also called pips) or is blank. The spots are generally arranged as they are on six-sided dice, but because there are also blank ends having no spots there are normally seven possible faces. Standard domino sets have ends ranging from zero spots to six spots (double six set), but specialized sets might range from zero to nine (double nine set), zero to twelve (double twelve set), zero to fifteen (double fifteen set), or zero to eighteen (double eighteen set). The back side of a domino is generally plain. Dominoes have been made of bone, ivory, plastic, metal and wood, and occasionally are made of cardstock like that for playing cards. Dominoes are rather generic gaming devices, like playing cards. Many different games can be played with a set of dominoes.

1 History
2 Domino tiles and suits
3 The ranks of domino pieces
4 Domino Sets
5 Common domino games
6 Other games
7 More Dominos
8 Other uses of dominoes
9 See also
10 References
11 External links

[edit] History

Dominoes are descendants of dice. The two ends on each of the original Chinese dominoes represented one of the 21 combinations that can occur with the throw of two dice. Modern western dominoes, however, have blank ends on them as well and so the number of dominoes is generally 28. Dominoes were apparently unknown in Europe until the 18th century and may have been invented in their modern form in the Dominican Republic. The dark spots on light faces apparently reminded people of masquerade masks with eyeholes (called dominoes) and thus gave the playing pieces their name. Chinese dominoes do not have blanks, but some whole tiles are duplicated.

[edit] Domino tiles and suits

Bones are generally named for the number of dots on the two ends of the bone. A bone with a 2 on one end and a 5 on the other end is called the 2-5, for example. Bones that have different numbers on the two ends are called singles, and bones that have the same number on both ends are called doublets or doubles. In Barbados, the doubles are referred to as couples. A double six would be referred to as couple six, a double five would be known as couple five etc.

Bones that share a common number of spots on one end are said to be of the same suit. In a double-six set, for example, 1-0, 1-1, 1-2, 1-3, 1-4, 1-5, and 1-6 all belong to the suit of one. All singles belong to two suits. The 1-2, for example, belongs to the suit of one and the suit of two. All doubles belong to one suit only by this definition. An alternate definition of suit allows all dominoes to have two suits, by counting the set of all doublets as an additional suit.

In Barbados, popular slang for the numbers on the dominoes are:

"0" is referred to as blank
"1" is referred to as "Ess" (like the letter "S")
"2" is referred to as "deuce"
"3" is referred to as "trey"

[edit] The ranks of domino pieces

The value of each end of a bone is determined by the number of spots on the end, with zero (blank) being the lowest and six being the highest. The rank of a bone is determined by the combined number of pips on the two ends. This rank is sometimes referred to as the bone's weight so that a higher ranking bone is called a heavier bone while a lower ranking bone is called lighter

[edit] Domino Sets

There are currently five major domino sets commercially available. They are Double Six, Double Nine, Double Twelve, Double Fifteen, and Double Eighteen. Here are the number of tiles and points (pips or spots) in each set through Double Twenty-Four. The largest commercially available set is the double 18.

Double 6: 28 tiles, 168 pips.
Double 9: 55 tiles, 495 pips.
Double 12: 91 tiles, 1092 pips.
Double 15: 136 tiles, 2040 pips.
Double 18: 190 tiles, 3420 pips.

Generally the most commonly used sets are Double Sixes and Double Nines, though the other three sets are more popular for games involving several players or for players looking for long domino games.

[edit] Common domino games

Men playing domino in Bukittingi Market, Sumatra, Indonesia

Most domino games are block games or draw games. In draw games, players draw from the boneyard when they have no matching bone. In block games, players pass and forfeit the turn when they have no matching bone. Otherwise, there is no difference. Both generally consist of several hands of dominoes played until either the sequence is complete (for example, with the double sixes playing seven hands, one hand for each denomination) or one of the players accumulates an agreed upon number of points and wins the series. Points are earned multiple ways, and may or may not be a good thing depending on the game. According to most train games, such as Private Trains, there is also a game called Mexican Dominoes, the goal is to have the least amount of points possible. Other games are just the opposite, where the goal is to accrue as many points possible. These games often have the rule that points are generally earned only by the first player in each hand to go out (play his or her last bone, also called to domino) and win the hand. In almost all domino games, the primary object is thus to play all one's bones before an opponent does.

There are many existing rules for determining which player is the leader (or downer), the player to make the first play of the hand. In some rules, the lead is determined by lottery. The bones are shuffled face down on the table, and each player draws one bone. The player with the highest double, or heaviest bone, or other agreed upon prize is designated the leader. By this rule, the leader then reshuffles the bones before the final deal. By other rules, the final deal determines the leader. In this case, the player with the highest double must lead by playing that double. If no player has a double, the heaviest bone is played. Playing the first bone of a hand is sometimes called setting the first bone, leading the first bone, downing the first bone, or posing the first bone, and the bone so set, led, downed, or posed is called the set, the lead, the down, or the pose. After the first hand, the winner of the previous hand is usually the leader for the next. By some rules, however, the lead rotates player to player across hands.

After the final shuffle the bones are dealt; each player in turn draws the number of bones required. The stock of bones left behind is called the boneyard, and the bones therein are said to be sleeping. If the leader was determined by lottery, the leader sets by placing any bone face up on the table. If the leader was not determined by lottery, the player with the highest double leads with that double, and if no player has a double, the hand is reshuffled and redealt. Or, if you are playing a train game, the players begin with either the highest or lowest domino (already set aside and placed in the middle of the playing area), and descend or ascend the numeric sequence (starting at 0s and going up, or starting at the highest double and going down).

The next player, and all players in turn, must play a bone with an end that matches one of the open ends of the layouts. Play continues until one of the players goes out (and calls "out!" or "domino!") and wins the hand or until all the players are blocked and no legal plays are left. This is in some areas referred to as a lockdown. If all the players are blocked, or locked out the player with the lightest hand wins.

In block games, players who cannot match on their turn must forfeit the turn by knocking (passing)--accomplished by rapping twice on the table or by saying, "go" or "pass". In draw games, players who cannot match must draw bones from the boneyard until obtaining a playable bone. According to most rules, the last two bones in the boneyard may not be drawn. If the boneyard is exhausted (only two bones left), the player knocks.

In games where points are acrued, the winning player scores a point for each pip on each bone still held by each opponent. If no player went out, however, and the win was determined by the lightest hand, the winning player sometimes scores a point for each pip on each bone still held by each opponent, and sometimes only the excess held by opponents. In some cases, mostly in many 'urban rules' games, if a "lockdown" occurs either the player that has locked out the other players will call "lockdown" and will gain the other players 'bones', or if it is noticed too late, the first player to call the "lockdown" will gain everyone else's bones, and the accumulation of the pips will be added to their score. A game is generally played to 100 points, the tally being kept with paper and pencil or on a cribbage board.

In games where the point is to score as little as possible, after one of the players goes out, or there are no legal moves left, the individual players add up the points in their hand and write it on the scoresheet.

[edit] Other games

There are also a variety of other games played with dominoes. Some are simple memory games like Concentration (based on the card game of same name), some are complex, and some are simple solitaire games. Common games include Private Trains and Chicken Foot

[edit] More Dominos

With bigger domino sets, especially with the Double Fifteens and Double Eighteens, it is possible to have more players. Double 9s is good for 4 to 6 players and each player would start with 7 dominos in their hand. Double 12s, 15s, and 18s are good for up to 10 to 15 players, each with 7 dominos. If you have fewer players and more dominos, start with more dominos in each players hand, but leave enough dominos in the bone pile to draw from. When using the larger sets, make sure you have plenty of playing room as they can spread out considerably.

Double 6s = 7 rounds, double 9s = 10 rounds, double 12s = 13 rounds, double 15s = 16 rounds, double 18s = 19 rounds.

[edit] Other uses of dominoes

Dominos waiting to fall

Other than playing games of strategy, another common pastime using domino tiles is to stand them on edge in long lines, then topple the first tile, which falls on and topples the second, which topples the third, etc., resulting in all of the tiles falling. Arrangements of thousands of tiles have been made that have taken several minutes to fall. By analogy, similar phenomena of chains of small events each causing similar events leading to eventual catastrophe are called domino effects.

The Netherlands has hosted an annual domino toppling exhibition called Domino Day since 1986. The event held on November 18, 2005 knocked over 4 million dominoes. Another new record was set at 4,079,381 stones on November 17, 2006.

The phenomenon has also some theoretical relevance (amplifier, digital signal, information processing), and this amounts to the theoretical possibility of building domino computers.