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Japanese mahjong (Japanese:麻雀,Hepburn:Mājan), also known asriichi mahjong (リーチ麻雀,rīchi mājan), is a variant ofmahjong. Japanese mahjong shares the same basic rules as other mahjong variants, but also features a unique set of rules such asriichi and the use ofdora. The variant is one of a few styles where discarded tiles are ordered rather than placed in a disorganized pile. This is primarily due to thefuriten rule, which takes player discards into account. The variant has grown in popularity due to anime, manga, and online platforms.

In 1924, a soldier named Saburo Hirayama brought the game to Japan.^[1] In Tokyo, he started a mahjong club, parlor, and school.^[1] In the years after, the game dramatically increased in popularity. In this process, the game itself was simplified from the Chinese version. Then later, additional rules were adopted to increase the complexity.^[2]Mahjong, as of 2010, is the most popular table game in Japan.^[3] As of 2008, there were approximately 7.6 million mahjong players and about 8,900 mahjong parlors in the country, and it was estimated that parlors made over 300 billionyen in sales that year.^[4] There are severalmanga andanime devoted to dramatic and comic situations involving mahjong (seeMedia).^[5] Japanesevideo arcades have introducedmahjong arcade machines that can be connected to others over the Internet. There are also video game versions ofstrip mahjong.

In Japan, there are what are known asprofessional players, usually members of organizations that compete in internal leagues and external events with other professionals and the general public. There are over 2,400 professionals spread across a half-dozen organizations. There is no universal authority for riichi mahjong in Japan: professionals cannot dictate how mahjong parlors or amateur organizations and players operate, nor can they regulate each other since everything is left to the free market. Likewise, there is no global authority regulating riichi mahjong. Since 2018, there exists a league of select professionals (coming from the other professional mahjong organizations) run byAbema named M.League which presents mahjong as a professional sport. Teams of professionals receive salary as players, compete in ranking and playoffs as teams, and wear team jerseys to enhance the image of mahjong as a sport.^[6][7]

Japanese mahjong is usually played with 136 tiles.^[8] The tiles are mixed and then arranged into four walls that are each two stacked tiles high and 17 tiles wide. 26 of the stacks are used to build the players' starting hands, 7 stacks are used to form adead wall, and the remaining 35 stacks form thelive wall from which tiles are drawn.

There are 34 different kinds of tiles, with four of each kind. Just like standard mahjong, there are three suits of tiles,pin (circles),sō (bamboo) andwan (characters), and unranked honor tiles (字牌,jihai). Honor tiles are further divided between wind tiles and dragon tiles. Some rules may have red number five tiles which work asdora that earn morehan value. The flower and season tiles are omitted. Names for suit tiles follow the pattern of [number] + [suit], the numbers being Japanese interpretations of the corresponding Chinese words.

Collectively, the circle, bamboo and character tiles are referred to asshūpai (数牌). Among them, the 1s and 9s are calledrōtōhai (老頭牌; or "terminals" in English), while the rest (2s through 8s) are thechunchanpai (中張牌). Together, the honor and terminal tiles make up theyaochūpai (么九牌).

Named as each tile consists of a number of circles.

īpin	ryanpin	sanpin	sūpin	ūpin	rōpin	chīpin	pāpin	chūpin

Named as each tile consists of a number of bamboo sticks (also interpreted as strings) that hold a hundred coins each. The face of the number one tiles is apeafowl.

īsō	ryansō	sansō	sūsō	ūsō	rōsō	chīsō	pāsō	chūsō

Named as each tile consists of a number of ten thousands (萬,wan, orman; see the lower character on the tile). Originally, this was 10,000 coins made up of 100 strings of 100 coins each (seemahjong tiles). Thekanji of number five usually becomes伍 instead of五. The modern Japanese standard useswan as the suit's suffix, most western languages including English will useman instead to avoid confusion with "one". The seven in this suit would thus be calledchīwan in Japanese, butseven-man (or7-man) in English.

īwan	ryanwan	sanwan	sūwan	ūwan	rōwan	chīwan	pāwan	chūwan

Named after the fourcardinal directions.

ton (East)	nan (South)	shā (West)	pē (North)

White (白,haku), Green (發,hatsu), and Red (中,chun). Often, the face of the White dragon tiles is blank white. The kanji of the Green dragon tiles in Japan is usually𤼵 which is slightly different from發 since it includes theradical矢 instead of殳.

haku	hatsu	chun

Many basic rules of mahjong apply to the Japanese variation. Valid collections of three tiles are called groups (mentsu), divided into triplets (kōtsu) and sequences (shuntsu). Players can also form a quad (kantsu) using four of the same tile.

Players can make a meld (open group) by calling for another player's discard. They reveal the meld on the table and then make their own discard. Calling for another player's discard makes the group and the hand open. When a winning tile of a closed hand is a discard, the group including that discard is also considered open, while the hand is still regarded as closed. The calls operate exactly the same as any variation of mahjong, except Japanese terminology is used.

Players can make an open sequential group, a sequence (three consecutive tiles in the same suit), by calling out "chii" (チー or吃) using a tile discarded by the player to their left. Players place the meld face up on the table, usually on the right side of their hands, with the discard placed sideways at the leftmost position of the meld to indicate which tile was taken from the left player's discard pile.

Players can make an open identical group, a triplet (three identical tiles in the same suit or honor tiles) by calling out "pon" (ポン or碰) using a tile discarded by any other player. Players place the meld face up on the table with one of those tiles placed sideways to indicate from whom the discard was taken.

Players can make a meld from four identical tiles in the same suit or four identical honor tiles. After calling a quad, the next adjacentdora indicator tile is flipped, and players need to draw a supplemental tile from the end of the dead wall. Depending on the rules, the number of tiles in the dead wall is kept at 14 by reserving the last available tile from the wall, or the number decreases at that time. There are three types of quads. Players call out "kan" (カン or槓) for all of them.

• Closed quad: Players can make a closed quad if they have four of the same tile in their hand. They reveal those tiles, then place them to the right side of their hand with two tiles face up and two face down. They then draw another tile from the dead wall. A closed quad does not use another player's discard and does not open their hand.
• Open quad: Players can make an open quad using another player's discarded tile if they have three of that same tile in their hand. They reveal the meld on the table with all four tiles face up, with one placed sideways to indicate from whom the discard was taken. Players cannot make this type of quad using an open meld of three tiles.
• Added open quad: Players can make an added open quad (加槓,kakan) (orshōminkan (小明槓)) by adding a self-drawn tile or a tile already in their hand to an open meld of the same three tiles.^[9] The tile is usually added sideways on top of the sideways tile in the open meld.

The order of precedence to pick up a discard when two or more players want it isron (winning via a discard tile) first,kan orpon second, andchii third.Kan andpon cannot happen at the same time since there are only four of each tile. Depending on the ruleset being used, these calls may be allowed when the next player has already drawn and seen their next tile. In such cases, that player takes first precedence if they calltsumo (winning via self-drawing a tile).

While the basic rules to mahjong apply with the Japanese variation, an additional, distinct set of rules are applied.

Hand types, oryaku, are specific combinations of tiles or conditions that yield the value of hands. Unlike many variants, a winning hand must have at least oneyaku. When scoring, eachyaku has its ownhan value, with everyhan approximately doubling the value of a hand up to a limit.

Ayakuman is a rareyaku with stringent criteria which automatically scores the maximum number of points, ignoring any other scoring patterns. In some variations, multipleyakuman can be scored at the same time.

Declaringriichi means declaring a ready hand, and is a kind ofyaku. A player may declare a ready hand if their hand needs only one tile to complete a legal hand (tenpai), and the player has not claimed another players' discards to makeopen melds. When declaringriichi, the player must place their 1,000-point stick and place their discarded tile sideways; the hand is then fixed and may not be changed except when forming certain closed quads. After declaring a ready hand, a player can win on any drawn or discarded tile even if their hand has no otheryaku.^[10]

As a possible house rule, a player can choose to reveal their hand when declaringriichi to win more points if successful, which is calledopenriichi (オープン立直,ōpun rīchi). In that case, the player shows only the tiles that are related towaits, or reveals all the tiles in the hand depending on the rules.^[11] The declaration increases thehan count allowing the player to score extra points.

Dora (ドラ) are bonus tiles that addhan value to a winning hand. Every kind of tile can become a bonus tile, allowing itshan value to increment based on the amount of its corresponding "indicator" tiles. Bonus tiles are not counted asyaku, regardless of the number of tiles present; the player still must form ayaku in order to count.^[12]

At the start of a hand, the upper tile from the third stack from the back end of the dead wall is flipped and becomes a bonus tile indicator.^[13] A tile of a next succeeding number or color is the bonus tile. For example, if an indicator is a Green dragon (), Red dragons () are counted as a bonus tile by the sequence shown below, in which the Red dragon wraps around to the White dragon ().

The succeeding order of bonus tile is as follows:

→→→→→→→→→

→→→→→→→→→

→→→→→→→→→

→→→→

→→→

The number of bonus tile indicators increases in the following manner: each time a player calls aquad, the next adjacent bonus indicator tile is flipped, starting with the upper tile from the fourth stack from the back end. The indicator is flipped immediately after the quad is called, and after that the player draws a supplemental tile for their hand from the back end of the dead wall. The number of indicators increases in that direction, which becomes five if a single player calls four quads, and that is the largest possible number from the upper tiles in the third to seventh stacks of the dead wall (seefour quads).

Additional bonus points can be awarded in the following situations:

• Hidden bonus tiles (裏ドラ,uradora): when a player wins with aready hand declaration, the tiles underneath the bonus tile indicators become additional bonus tile indicators as well.
• Red 5 tiles (赤ドラ,akadora): a variation uses specially marked red number 5 tiles that are also bonus tiles, regardless of whether it is indicated or not. The red 5 tiles also stack with normal bonus tiles if the indicator tile displays a 4. One red 5 tile for each suit is usually used in place of regular five tiles, with some local variants using various amounts (two 5-pin only, two 5-pin and one 5-sō and 5-wan, two of each 5 in all three suits,et cetera). In some variations, tiles of other numbers such as 3 or 7 can be marked red.^[12]

Among the modern mahjong variants, the Japanese scoring system is unique. Two variables are considered: thehan value andfu value. A winning hand acquires points based on these values, which correspond to apoints-value table.Fu counting is unnecessary if the hand contains at least fivehan.

A player winning a hand via another player's discard calls out "ron" (ロン or栄, picking up a discard). The opponent who discarded the winning tile must pay the full value of the hand to the winner.

A player winning with a self-drawn tile declares "tsumo" (ツモ or自摸). In this case all three opponents split the payment to the winner. Based on thescoring table, the number of points paid depends on which player is the dealer. If the winner is the dealer, the value of the hand is 1.5 times greater than normal, and the other players split the payment equally. If the winner is a non-dealer, the dealer contributes half the value of the hand, while the non-dealer opponents each contribute a quarter.

In many mahjong variants, discards are simply placed in the middle of the table in a disorganized fashion. However, in the Japanese variant, tiles are neatly placed in order of discard in front of each player. Customarily, discards are placed in rows of 6 tiles. In addition, open calls forchii,pon, andkan have discard specific rules, by which they must indicate the source and type of discarded tile. This way, a record is maintained of all discarded tiles corresponding to each player. Proper game strategy takes into account the state of the discards in addition to the players' hands.

There are three situations in which a win using another player's discard is forbidden. In such cases, the player is said to be in a state offuriten (振聴):^[14]

1. A player cannot win on any discard if any of their potential winning tiles are present in their discard pile.^[15] This includes tiles that have been called by other players for open melds.^[16]
2. If a potential winning tile is discarded and the player does not call it to win, that player cannot win on any discard after it until their next turn. This is known as "temporaryfuriten". Generally, other players making open melds does not end temporaryfuriten.^[17]
3. Temporaryfuriten becomes permanent afterriichi; if a player passes on any chance to win a hand (either passes on a winning discard, or discard a drawn winning tile) after declaringriichi, that player can no longer win on any discard.

For the purposes offuriten, potential winning tiles include any tile which would complete the structure of the hand to form four melds and a pair, even if the player could not actually win with that tile due to the resulting hand having noyaku.

In Japanese mahjong, many rules allow abortive draws to be declared while tiles are still available. They can be declared under the following conditions:

• Nine different terminal and honor tiles (九種九牌,Kyūshu kyūhai), shortened fromkyūshu yaochūhai tōhai (九種么九牌倒牌): On a player's first turn when no meld has been called, if a player has nine different terminal (also known as major^[18]) or honor tiles, the player may declare the hand to be drawn. For example, the hand may be. Instead of declaring a draw, the player could choose to go for thethirteen orphans (kokushi musō) hand.
• Four winds barrier (四風子連打,Sūfontsu rendā): On the first turn without any meld calls, the hand is immediately drawn when all four players discard the same wind tile.
• Four players ready (四家立直,Sūcha riichi), orYonin riichi (四人立直): If all four players declare a ready hand, the hand is drawn after the last player discards without dealing in.
• Four quads abort (四槓散了,Sūkan sanra): The hand is drawn when a winning hand cannot be made from the discard after the fourth quad is called, unless all the four quads were called by a single player. If the four quads were collectively called by two or more players, the game may end upon the last player to make a quad discarding (either safely or dealing in), or it may end immediately. If all four quads were called by a single player, the hand continues. Once four quads have been made and the game is allowed to continue, generally, a fifth quad is unable to be formed. Like most optional settings, it is possible that a local mechanism is in place to allow for further quads, but is very rare.

Players may bepenalized under the following circumstances:

• Gotsumo (誤ツモ) andgoron (誤ロン): calling respectivelytsumo orron with an invalid hand
• Declaring a closedkan afterriichi if thekan changes the player's waits
• Furiten ron: callingron whilefuriten
• Nōten riichi (ノーテンリーチ): callingriichi while not intenpai
• Tāhai (多牌) andshōhai (少牌): having more or fewer tiles than allowed (depending on the rules)^[19]
• Yamakuzure (山崩れ;lit. "landslide"): damaging the wall to the point that it cannot be recovered[19]

A game ends after the last hand of the last round, which is usually the South round.

A game ends when a player's score becomes negative (below zero), or in some rare local rules, at zero points or less. Some rules may allow continued gameplay with a player having a negative point value.

Some rule sets allow for the last dealer to decide whether to continue playing extra hands in the final round or stop. A runaway victory (あがりやめ,agari yame; "win and stop") is when the last dealer decides to exercise this option after winning a hand, for instance when they are the top player at the time.^[20] In some cases, a stop may be allowed simply for playing a hand and ending with a ready handtenpai yame (聴牌やめ), or in very rare cases, allow the last dealer to end the game regardless of position.

If the score of the top player is less than 30,000 points after the last hand of the last round, the game continues into the West round (西場,shāba) in some rules. This situation is calledshānyū (西入; "entering West"). The prevailing wind becomes West. A North round (北場,pēba) may come next in the same way. Depending on the rules, it can be followed by an East round again or instead White dragon, Green dragon, Red dragon and East rounds.^[20] Any extra round ends as soon as one player has 30,000 points or more.

At the end of a match, players are often given bonus points or penalties depending on their placement (seefinal points and place).

In an optional rule calledyakitori (焼き鳥, "grilled bird"), if one did not win a hand in a match, that player pays a penalty. At the start of a match, each player has a marker calledyakitori māku (mark) (焼き鳥マーク, "grilled bird mark") on the table, and a player flips their own after winning a hand.^[21] Chips or coins are also used as substitutes, and they are often removed instead of being flipped.

Often in mahjong parlors across Japan, an additional bonus payment calledshūgi (祝儀) is given to players who won their hand. For each shūgi the winning hand has, additional payments are made by either the player who threw the winning tile, or by each player in the case of a self-draw.^[22]Common shūgi are:

• Limit value hands (yakuman 役満)
• One-shot (ippatsu 一発)
• Red fives (or other extra red tiles)dora (aka-dora 赤ドラ)
• Ura-dora (裏ドラ)

Japanese mahjong has an extensively developed theory. Japanese mahjong is reliant on both skill and luck, so strategy focuses on gaining probabilistic and strategical advantages.^[23]

Japanese mahjong is a comparative point game. Unlike betting variations of mahjong, decisions are made compared to other players instead of a strictexpected value basis. As mahjong is a game dependent onpsychology andgame theory, experienced players may deviate from optimal decision-making in order to bluff or mislead opponents.

In Japanese mahjong the first player to complete their hand wins the round. As a result, it is typically advantageous for players to reach a complete hand as fast as possible.

Tile efficiency, also known as tile acceptance theory, is a concept to estimate which tile is best to discard. The goal is to move to a completed hand as fast as possible, aided by maximizing the number of available tiles that improve the hand

Discards should aim to reduce theshanten (向聴) of the hand, the number of tiles required to reach a ready hand (tenpai). As a consequence, discards should also aim to increase theukeire (受け入れ) of the hand, the number of tiles that can be drawn to reduce shanten.

Unlike some other mahjong variants, in Japanese Mahjong the player who deals in pays the full point value of the winning player's hand. Defense revolves around avoiding dealing into a player with atenpai hand.

Thefuriten rules can be used to identify safe tiles known asgenbutsu (現物). Both the contents and order of tiles in a player's discard pile can be further used to identify tiles that are either statistically unlikely or impossible to be one of their winning tiles.

Push-fold decisions revolve around using tile acceptance and defensive information to weigh whether a player should pursue a winning hand at the risk of dealing in, against abandoning completing their hand in order to discard the tiles least likely to deal in.

Push-fold lies on a spectrum of decisions includingbetaori (ベタ降り), the complete abandonment of winning in order to avoid dealing in to atenpai player;zentsuppa (全ツッパ), conversely aiming to complete one's hand without regard to the risk their discarded tiles may pose; andmawashi (回し打ち), stepping back inshanten to avoid dealing in while still leaving open the opportunity to win the hand.

There is a three player version calledsanma (三麻), which eliminates all but the 1 and 9 tiles from themanzu suit, and removes the ability to call "chii".There is a four player version called "Clear Mahjong" that was created by Noboyuki Fukomoto for the manga "Ten: Tenhōdōri No Kaidanji".^[24]There is a version for two players called "San Hako Mahjong" that keeps all tiles, permits calling "chii", and utilizes a dummy player.^[25]

Japanese mahjong is featured inanime andmanga series such asAkagi, which has also been made into a live action television series,The Legend of the Gambler: Tetsuya,Saki andMudazumo Naki Kaikaku. A live action series namedShin Janki (真・雀鬼) features the game involving yakuza and gambling, while employing various cheating tactics and techniques.

In the 2009 anime dramaDetective Conan: The Raven Chaser, the plot revolves around a serial killer who leaves mahjong tiles next to the bodies of his victims (the one of circles tile next to the body of the first victim and the tiles of the seven of circles next to the bodies of the other six victims)

Japanese mahjong is played online on platforms such asTenhou andMahjong Soul. In addition, many game consoles port mahjong games, as well as various PC and mobile phone software.It is also featured as aminigame in several video games, including theLike a Dragon franchise andFinal Fantasy XIV.

Outside Japan, there are clubs sporadically located across Europe, North America, Asia and South America. There are also tournaments of various sizes, the largest outside of Japan being theWorld Riichi Championship. Smaller events, such as theEuropean Riichi Championship, as well as a few other tournaments can have attendance numbers of tens of people, sometimes even over 100 at events like the European Riichi Championship, and as high as 224 at the World Riichi Championship (2017 Las Vegas edition). The total reach extends to almost 50 countries, but some countries may have few players, others may have hundreds or thousands.

• World Riichi Championship
• European Mahjong Association

• World Riichi Championship Rules and Clarifications page
• European Mahjong Association's Riichi Ruleset

• Mahjong
• Mahjong video games

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