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Scoring in Mahjong, a gambling game for four players that originated in China, involves the players obtaining points for their hand of tiles, then paying each other based on the differences in their score and who obtained mahjong (won the hand). The points are given a monetary value agreed by the players. Although in many variations scoreless hands (推倒胡 tui dao hu in Mandarin, 雞糊 gai wu in Cantonese) are possible, many require that hands be of some point value in order to win the round.

While the basic gameplay is more or less the same throughout mahjong, the greatest divergence between variations lies in the scoring systems. Like the gameplay, there is a generalized system of scoring, based on the method of winning and the winning hand, from which Chinese and Japanese (among notable systems) base their roots. American mahjong generally has greatly divergent scoring rules (as well as greatly divergent gameplay rules).

Because of the large differences between the various systems of scoring (especially for Chinese variants), groups of players will often need to agree on particular scoring rules before a game, in order to eliminate possible disputes during the game. Like with gameplay, many attempts have been made to create an international standard of scoring, but most are not widely accepted.

Points are obtained for a hand by matching it against various criteria, with different criteria scoring different values. Criteria can include particular melds or other tiles held, how the (winning) hand was completed, possession of various special combinations, etc. Some of these criteria may be subsets of other criteria (for example, having a meld of one dragon versus having a meld of all of them), and in these cases, only the criteria with the tighter requirements is scored. The points obtained may be translated into scores for each player using some (typically exponential) function. When gambling with mahjong, these scores are typically directly translated into sums of money paid between players.

The terminology of point differs from variation to variation. A common English term is double, as the point-to-score translation is typically exponential with a base of 2. (This is not to be confused with the doubling applied to the basic point score in some variations). Chinese variants will use the term 番 (pinyin: fan). Taiwanese mahjong, however, uses the term 台 (pinyin: tái) along with a linear scoring system.

Points and score relate to two distinct concepts - based on the points obtained in a round, and other factors, players pay each other money. Chips or similar tokens can be used instead, or a score can simply be calculated.

Each player begins the game with the same score. When settling up, in many cases only the winner is paid with the winner's gain being deducted from the three losers' scores (that is, the losers pay the winner). However, payment between players can be arranged in other ways. A common set of modifiers (for which this article will call the standard payment variations) include:

- In the case where a player wins by a discard (a player picks off an opponent), the player who performs the discard pays double
- In the case where a player wins by a draw (a player wins by self-pick), every losing player pays double.
- In the case where a player wins from a high-risk scenario (see below), the player who performs the discard pays for the other two losing players (in addition to the normal double share).

If playing with chips, there is no universal rule for the situation when a player runs out. In some circles, the match is immediately aborted, with the player furthest ahead in score declared the winner, while in others, a player out of chips continues to play without risk of further losses. Alteratively, the loser may pay cash to buy back chips from the winners and the game continues.

The rules mentioned below are by no means exhaustive or common to every variation, but are common to many 13-tile and 16-tile variations.

- each player adds up basic points for his hand based on possession of certain melds, pairs and bonus tiles
- winner adds additional basic points for obtaining mahjong, and possibly for completing his hand in various special ways (for example, getting his last tile from the wall)
- each player doubles his basic points one or more times based on possession of certain rarer melds or combinations of melds (for example a set of the prevailing wind tiles)
- winner doubles his basic points one or more times based on his hand forming certain rarer patterns (for example, composed entirely of honour tiles) or being completed in a special way (for example, robbing an exposed kong)

The winner collects his total points from each of the three losers. The losers pay each other the difference in their points. East pays or receives double amounts in his transactions.

Various "Special Limit" hands exist which, if obtained (which is unlikely), give the holder the maximum permitted amount (the limit) of points for his hand.

The traditional Hong Kong scoring system, or the Cantonese scoring system, is widely considered to be the most popular scoring systems, as scoring tends to be low due to the low amount of criteria used.

The general scoring modifiers apply (see above), with the point translation function being a piecewise function: a constant amount is given for scoreless hands and the score is doubled for each point (i.e., an exponential function). Because zero-point hands are common, players often play with the additional restriction that a winning hand must be of some point value, often anywhere between one and five points, with three being the most common.

The Taiwanese system follows a different payment procedure from the standard procedure mentioned earlier:

- In the case where a player wins by a discard (a player picks off an opponent), the player who performs the discard pays each winner (there may be more than one).
- In the case where a player wins by a draw (a player wins by self-pick), each player except the winner pays the winner.

When the dealer is involved in either the winning or losing side of a hand, extra tai (one plus twice the number of times the dealer has consecutively retained dealership) are added to the dealer's winnings or losses.

Singaporean scoring is similar to that of the Chinese Classical system, but accounts for the different set of tiles used therein. Again, standard payment variations apply, although variants exist where the dealer must also pay and receive double.

The Japanese scoring system is the system that is found in many Mahjong video games. In this variation, each player starts with a score anywhere between 20000 to 30000, which is typically represented by a series of bars resembling elongated Chinese dominoes, in four denominations: 10000, 5000, 1000, and 100. Should a player run out of bars, the game immediately ends, with the player furthest ahead in score declared the winner.

Today, in the American variations, players use a card that define a small set of hands that are the only valid winning hands, with a point value given for each hand. This system is used by the two major governing bodies of Mahjong in the United States, the National Mah Jongg League and the American Mah-Jongg Association, with new cards that define the valid winning hands released annually.

Typically, each card contains scoring criteria that makes references to the year the scoring cards are released. For example, the 1985 scoring hand will have hands containing "melds" of a one, nine, eight, and five of a certain suit.

A scoring limit may be more of a gambling incentive: for example, if six and nine points were scoring limits, a seven- or eight-point hand would be worth the same as a six-point hand, which may be an incentive for players to go for nine-point hands.

- Mahjong Rules. Retrieved on 2008-08-12..

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Last updated on Sunday August 31, 2008 at 00:22:47 PDT (GMT -0700)

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Last updated on Sunday August 31, 2008 at 00:22:47 PDT (GMT -0700)

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