Mahjong

Mahjong

Mahjong, sometimes spelled Mah Jongg, is a game that originated in China, commonly played by four players with some three-player variations found in Korea and Japan. The four player table version should not be confused with the popular Western single player tile matching computer game Mahjong solitaire, which is a recent invention and completely different from the table game. Similar to the Western card game rummy, mahjong is a game of skill, strategy and calculation and involves a certain degree of chance. In Asia, mahjong is also popularly played as a gambling game though it may just as easily be played recreationally.

The game is played with a set of 136 tiles based on Chinese characters and symbols, although some regional variations use a different number of tiles. In most variations, each player begins by receiving thirteen tiles. In turn players draw and discard tiles until they complete a legal hand using the fourteenth drawn tile to form four groups melds and a pair head. There are fairly standard rules about how a piece is drawn, stolen from another player melded, the use of basic numbered tiles and honours winds and dragons, the kinds of melds, and the order of dealing and play. However there are many regional variations in the rules; in addition, the scoring system, the minimum hand necessary to win varies significantly based on the local rules being used.

All tiles are placed face down on the table and are shuffled. By convention all players should participate in shuffling using both hands moving the pieces around the table, loudly, for a lengthy period. There is no fixed rule on how to deal or how to treat tiles which flip over during shuffle, though possible solutions include turning back over the pieces at the moment they are seen, turning over all revealed pieces at intervals or doing so at the end of the shuffling and forming of the wall.

Each player then stacks a row of 18 tiles two tiles high in front of him for a total of 36 tiles. Players then push each side of their tiles together to form a square wall.

The dealer throws three dice and sums up the total. Counting counterclockwise so that the dealer is 1 or 5, 9, 13, 17, so that south is 2 or 6, 10, 14, 18, etc., a player's quarter of the wall is chosen. Using the same total on the dice, the player then counts the stacks of tiles from right to left. Starting from the left of the stacks counted, the dealer takes four tiles to himself, and players in counterclockwise order take blocks of four tiles until all players have 12 tiles, so that the stacks decrease clockwise. Each player then takes one last tile to make a 13-tile hand. Dealing does not have to be this formal and may be done quite differently based on house rules.

Each player now sets aside any flowers or seasons they may have drawn and takes replacement pieces from the wall.

The dealer takes the next piece from the wall, adds it to his hand. If this does not complete a legal hand, he then discards a piece throwing it into the middle of the wall with no particular order in mind.

Local play on the street in Lanzhou

Each player takes a turn picking up a tile from the wall and then discarding a tile by throwing it into the centre and, if desired, announcing out loud what the piece is. Play continues this way until one player has a legal hand. At this point a player will call out mahjong and reveal their hand. There are four different ways that this order of play can be interrupted which is mentioned below.

During play, the number of tiles maintained by each player should always be thirteen tiles meaning in each turn a tile must be picked up and another discarded. Not included in the count of thirteen tiles are flowers and seasons set to the side and the fourth added piece of a kong mentioned below. If a player is seen to have more or less than thirteen tiles in their hand outside of their turn they are penalised.

Betting arbitrage, miracle bets, sure bets, sports arbitraging is a particular case of arbitrage arising on betting markets due to bookmakers’ different opinions on either event outcomes or plain errors. By placing one bet per each outcome with different betting companies, the bettor can make a profit. In the bettors' slang an arbitrage is often referred to as an arb; people who use arbitrage are called arbers. A typical arb is around 2 percent, often less; however 4-5 percent are occasionally seen and during some special events they might reach 20 percent. Arbitrage betting involves relatively large sums of money stakes are bigger than in normal betting.

Bookmakers generally disapprove of arbers, and restrict or close the accounts of those who they suspect of engaging in arbitrage betting. Although arbitrage betting has existed since the beginnings of bookmaking, the rise of the Internet, odds-comparison websites and betting exchanges have enabled the practice to be easier to perform. On the other hand, these changes also made it easier for bookmakers to keep their odds in line with the market.

The best way of generating profit, which has been established in Britain via sports arbitrage, consists of 'key men' employing others to place bets on their behalf, so as to avoid detection and increase accessibility to bookmakers. This allows the financiers or key arbers to stay at a computer to keep track of market movement.

While often claimed to be risk-free, this is only true if an arb is successfully completed; in reality, there are several threats to this:

Arbs in online sports markets have a median lifetime of around 15 minutes, after which the difference in odds underpinning them vanishes through betting activity. Without rapid alerting and action, it is possible to fail to make all the legs of the arb before it vanish, thus transforming it from a risk-free arb into a bet. High street bookmakers however, offer their odds days in advance and rarely change them once they have been set. These Arbs can have a lifetime of several hours.

Making errors: In the excitement of the action and due to the high number of bets placed, it is not uncommon to make a mistake like traders on financial markets. For example the appropriate stakes may be incorrectly calculated, or be placed on the wrong legs of the arb, locking in a loss, or there may be inadequate funds in one of the accounts to complete the arb. Those errors might temporarily have an important impact. In the long term, the benefit will depend on the odds. For example one could actually make more money by placing the wrong bet where the outcome happens to be beneficial, though not justified by the arbitrage calculation. However, this stroke of luck being repeated is unlikely, assuming the bookies have calculated the odds so they make a profit.

Bet cancellation: If a bettor places bets so as to make an arbitrage and one bookmaker cancels a bet, the bettor could find himself in a bad position because he is actually betting with all the risks implied. The bettor can repeat the bet that has been cancelled so as minimize the risk, but if he cannot get the same odds he had before he may be forced to take a loss. In some cases the situation arises when there are very high potential payouts by the bookie, perhaps due to an unintentional error made while quoting odds. Many jurisdictions allow bookmakers to cancel bets in the event of such a palpable [obvious] error in the quoted odds This is often loosely defined as an obvious mistake, but whether a palp in fact has been made is often the sole discretion of the bookmaker.

Other problems: Bookmakers who suspect arbing can set very low maximum stake limits, making arbing insufficiently profitable. Capital diffusion is serious; many bookmakers make it very easy to deposit funds and difficult to withdraw them. Making a return involves many bets spread over typically many bookmakers so keeping track is a considerable challenge, and requires excellent record-keeping.

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Shuffling

Shuffling is a procedure used to randomize a deck of playing cards to provide an element of chance in card games. Shuffling is often followed by a cut, to help ensure that the shuffler has not manipulated the outcome. A common shuffling technique is called the riffle or dovetail shuffle, in which half of the deck is held in each hand with the thumbs inward, then cards are released by the thumbs so that they fall to the table interleaved. Many also lift the cards up after a riffle, forming what is called a bridge which puts the cards back into place. This can also be done by placing the halves flat on the table with their rear corners touching, then lifting the back edges with the thumbs while pushing the halves together. While this method is more difficult, it is often used in casinos because it minimizes the risk of exposing cards during the shuffle. There are two types of perfect riffle shuffles: if the top card moves to be 2nd from the top then it is an in shuffle, otherwise it is known as an out shuffle which preserves both the top and bottom cards.

Riffle shuffling does, however, carry a risk of damaging cards from excessive bending. Casinos often replace their playing cards to prevent cheating from players that detect deformations in the cards. However, collectible card game cards are considerably less replaceable than playing cards, and CCG cards can be damaged from riffle shuffling, even when protected with card sleeves.

Because standard shuffling techniques are seen as weak, and in order to avoid inside jobs where employees collaborate with gamblers by performing inadequate shuffles, many casinos employ automatic shuffling machines. They also save time that would otherwise be spent shuffling, allowing several more hands per hour to be played and increasing the profitability of the table. These machines are also used to lessen repetitive motion stress injuries to a dealer. Note that the shuffling machines have to be carefully designed, as they can generate biased shuffles otherwise: the most recent shuffling machines are computer-controlled, though they have not yet fully been integrated into gaming.