The Underlying Logic of Riichi and Chinese Official Mahjong, Part 5: The Rules System (II)

Related articles:

The Underlying Logic of Riichi and Chinese Official Mahjong, Part 1: Payment Systems

The Underlying Logic of Riichi and Chinese Official Mahjong, Part 2: Winning Requirements

The Underlying Logic of Riichi and Chinese Official Mahjong, Part 3: Design Principles

The Underlying Logic of Riichi and Chinese Official Mahjong, Part 4: The Rules System (I)

A system of rules built around full-discarder payment

In contrast to Chinese Official Mahjong's lack of winning prohibitions, Japanese mahjong has its unique and extremely strict furiten rules. Furiten was fundamentally generated by the full-discarder payment system and can be regarded as its inevitable consequence.

Full-discarder payment gives rise to furiten

Full-discarder payment, Japanese mahjong's first original rule, is essentially an expanded form of responsibility payment. It extends the classical concept of responsibility for large hands such as Full Flush to every winning hand, making the discarder cover all three losers' payments. The idea that the discarder must bear full responsibility resonates strongly in Japanese culture, allowing the rule to become established and widely accepted. At the same time, no player wants to be the excessively punished discarder. In actual play, people naturally sought ways to reduce deal-in risk or improve their chances of avoiding it. This is the underlying logic of furiten. For its historical development, see chapters 10, on the emergence of payment by the discarder alone, and 11, on a rule unique in the world, in The Road to Modern Mahjong, listed in Notes on the History of Japanese Mahjong: Contents.

Furiten is a state in which a player can win only by self-draw, not by claiming another player's discard. It can arise in two ways: discard furiten, when a player's own earlier discards include a tile that currently completes the hand; and missed-win furiten, when a player could have won but did not. Missed-win furiten is further divided into temporary furiten before riichi, which ends at the player's next draw, and riichi furiten, where passing a win after riichi leaves the player able to win only by self-draw for the rest of the hand.

The original motive for furiten, like the same-turn passing prohibition, was to avoid disputes among players. Suppose A discards a tile and B follows with an identical tile. If C declines A's tile but wins on B's, it may look like a targeted attack. Before furiten, full-discarder payment made the discarder bear the entire loss, a particularly contentious outcome when money was at stake. Under this pressure, restricting passing and then claiming became a consensus. Initially, the prohibition covered only a winning tile missed or declined in the same turn cycle, a relatively reasonable restriction. It then expanded into today's strict system.

In time, all of a player's previous discards became relevant, not merely those in the current cycle. Every draw is random, and each discard is a decision based on the hand and public information at that moment. No one can guarantee that an earlier discard will not become valuable later. Prohibiting a win on one's own previously discarded tile conflicts with basic tile logic and freedom of play and rejects the traditional technique of winning on a tile previously thrown away.

More seriously, the restriction extends beyond claiming those discarded tiles: merely waiting on one also makes the player furiten, unable to win on any discard. A restriction on previously discarded tiles has thus become discard furiten. The narrower prohibition might have limited practical effect, but furiten is even harder to justify logically: why should waiting on one previously discarded tile prevent a win on a different tile discarded by someone else? When constructing Mixed Triple Chow or Pure Straight, 456 may satisfy the pattern while 345 does not. Discarding 3 and waiting on 6 is common and reasonable, yet Japanese rules can make the hand furiten. Riichi then added a further permanent missed-win restriction, completing the three familiar forms: temporary, discard, and riichi furiten.

We can therefore see that the many restrictions on discard wins did not arise from tile logic or considerations of soundness, but to ease dissatisfaction with full-discarder payment's excessive punishment. In essence, stricter restrictions repair the defects of an earlier rule—a larger patch covering the original flaw.

Furiten leads to ordered discards and discard reading

Neatly arranging discards is also originally a specifically Japanese rule, absent from other forms of mahjong. Some more competition-oriented rules take the opposite approach: each discarded tile is shown and then turned face down, like played cards in bridge or Shengji, requiring memory rather than allowing inspection. In recent years, competitive Chinese Official Mahjong and other rules have also begun requiring orderly discards, and digital games can easily display them in rows. In traditional Chinese mahjong, however, a face-up tile not claimed for a chow, pung, or kong is already public information; there is no need to arrange discards in order.

Japanese mahjong needs ordered discards to check furiten. Each player discards more than a dozen tiles on average, leaving forty or fifty across the table. If these are piled together as in Chinese mahjong rather than arranged in front of their owners, furiten judgments can become contentious. Players differ in memory and interest, making agreement difficult. Ordered individual discard rows allow each tile to be traced and avoid disputes.

From another perspective, this reduces the memory burden. In bridge, double-deck Shengji, and Dou Dizhu, played cards are usually turned over, so players must remember them; card counting is a core skill. Allowing face-up ordered rows would fundamentally change those games. Mahjong, by contrast, has far more tile categories and 136 tiles, exceeding even two decks of cards at 108. Its unknown wall also differs fundamentally from card games where the deal is random but the allocation is fixed once play begins. Traditional mahjong therefore leaves discards visible in an unordered pool so ordinary players can estimate remaining tile types and quantities. Stronger memories can retain each player's discard sequence and infer additional offensive and defensive information. Requiring ordered discards levels this memory advantage between ordinary and expert players and reduces the burden on everyone.

Finally, although ordered discards originated in the practical need to check furiten, they do make the table neater and more ceremonial while having little effect on competitive character. It is therefore a rule worth promoting and has already been widely adopted in more formal competitive environments.

The defense created by furiten

Japanese mahjong is well known for emphasizing defense, with furiten as a central mechanism. It identifies tiles that are absolutely safe against particular opponents, making discard reading a basic and crucial defensive skill. Full-discarder payment also means that only the discarder loses points on a discard win, unlike systems that divide the loss among all three opponents. Folding therefore becomes a strategic option for maximizing returns and managing risk.

Together, full-discarder payment and furiten make defense more important in Japanese mahjong than in Chinese Official Mahjong. Some therefore argue that furiten increases skill and competitiveness. The nature of skill and competition, the relationship between offense and defense, and furiten's advantages and disadvantages deserve a separate discussion rather than an extended analysis here.

The historical account above nevertheless shows that furiten was not designed to improve competition. Japanese mahjong's key mechanisms—from full-discarder payment and furiten to riichi and dora—developed with gambling as their driving force. Where real money is involved, any result seen as unfair directly prompts rule changes. Classical Chinese dealer-double payments shared among three losers were considered unfavorable to the dealer and provoked complaints, leading to full payment by one discarder. That created further dissatisfaction, prompting additional repairs: first forbidding wins on previously discarded tiles, then extending the restriction to multiple waits, and eventually prohibiting all discard wins while furiten.

As The Underlying Logic of Riichi and Chinese Official Mahjong, Part 3: Design Principles argued, almost any new mechanism in an existing ruleset introduces new skills unless it is entirely random, like bird or horse bonuses. Full-discarder payment and the resulting furiten certainly brought a new technical system to Japanese mahjong. But they were neither created to enhance competition nor systematically designed on scientific principles. Over a century, the rules evolved like adding flour when dough is too wet and water when it is too dry: successive patches formed a complex, internally coherent system in which changing one element affects everything else.

Comparing Japanese and Chinese Official styles

Riichi and Chinese Official Mahjong are two of the most fully developed competitive systems. Their differing philosophies and supporting provisions ultimately produce sharply contrasting styles of play.

The tension between concealment and hand-building

At its most basic, mahjong transforms a disordered initial hand through repeated draws and exchanges into four melds and a pair. In this broad sense, all mahjong is hand-building: constructing a basic winning structure. The initial thirteen tiles and every subsequent draw are random and passively received. Players chiefly exercise active skill in two ways: selective discarding and strategic calls of chows, pungs, and kongs.

In the narrower Chinese sense, hand-building means going beyond the basic structure to construct patterns of greater beauty and difficulty. With calls allowed, a basic four-meld-and-a-pair win is easy; someone can win after only five or six turns on average, leaving little entertainment or depth. Actual regional rules therefore add aesthetic and difficult patterns to varying degrees and reward them more highly. Chinese mahjong has created hundreds of patterns, with 81 selected for Chinese Official Mahjong—far more than in other rulesets, including Japanese mahjong—reflecting its commitment to hand-building.

Japanese mahjong places exceptional importance on concealment. Concealed riichi is both its signature feature and a core strategy. Its extensively studied tile efficiency chiefly concerns discard decisions: using the current hand and visible discards to choose the best discard and maximize the probability that the next draw from the remaining wall will improve the hand. Because concealment is encouraged and opening discouraged, calling techniques carry relatively less weight in its overall skill system.

Chinese mahjong, represented by Chinese Official rules, instead emphasizes large hands made from beautiful scoring patterns, rather than large scores generated by dora and similar multipliers. Actively constructing the necessary tile groups through chows, pungs, and kongs is central to hand-building skill. If concealment is emphasized too strongly, only one's own draw out of every four can be used; calls can in principle make use of discards from all players, greatly improving the chance of completing a particular pattern. From a hand-building perspective, calls encourage construction, whereas concealment works against it.

Tile efficiency remains important as part of discarding in Chinese Official Mahjong. Discards also involve richer interaction because players must constantly account for opponents building patterns through calls. As the saying goes, watch the player before you, monitor the player after you, and pay attention to the player opposite. Players seek their own calling opportunities while restricting others, especially the next player's access to useful tiles. Japanese mahjong's general preference for concealment means both oneself and others call less often. Offensive and defensive interaction during discarding is consequently weaker, and optimization focuses more on one's own hand.

Overall, Chinese mahjong emphasizes active construction through calls, balancing discarding and calling skills in a highly interactive game. Japanese mahjong relies more on concealed, passively received draws and efficient discarding, with offense and defense concentrated in the middle and late stages when furiten supports folding.

Balancing offense and defense

For players, the largest stylistic difference is often offensive versus defensive orientation: Japanese mahjong emphasizes defense, while Chinese Official Mahjong favors attack. This chiefly comes from the payment systems. The earlier comparison, Push/Fold Decisions and Mahjong Payment Systems, Part II, shows that among the various systems, Japanese full-discarder payment most encourages defense, while Chinese Official payments most favor offense.

Japanese full-discarder payment punishes dealing in most severely. Riichi explicitly announces when an opponent becomes ready; ura-dora prevents an accurate estimate of the opponent's score; and furiten supplies absolutely safe tiles. Together these mechanisms produce a characteristic approach: without a clear pattern, remain concealed and reach readiness quickly, generally declaring riichi when ready. If another player declares first, fold in most situations and use their discards to identify safe tiles. Thus Japanese mahjong's overall style is passive and conservative: offense relies on the efficiency of passive draws, while defense aims to avoid dealing in.

Chinese Official Mahjong instead uses a fixed base payment plus triple payment for self-draw, examined in What Does “Triple Payment for Self-Draw” Really Mean in Chinese Official Mahjong? It is effectively a modified discarder-double system. The self-draw/discard-win receipt ratio is not the apparent threefold difference; in most cases it lies between 1.5 and 2. However, the fixed base means that as a hand's value rises, its return relative to that value falls, on either type of win. For large hands, the effective self-draw return falls to about half the baseline, and the discard-win return to only a quarter. Consequently, the best strategy is to race for small hands just reaching eight points, suppressing large-hand construction. This payment system conflicts with Chinese Official Mahjong's original hand-building purpose and encourages attack, since defense is not worthwhile in most situations.

Japanese and Chinese Official Mahjong each build a complete system around different ideas, producing distinct competitive styles. In offense and defense, however, they have in some respects moved toward opposite extremes, neither achieving an ideal balance, and both have weaknesses in their detailed design. Researchers and practitioners have therefore continued experimenting with reforms and reconstruction, seeking more scientifically sound systems that combine enjoyment with competitive depth.