Evaluating Three Competitive Mahjong Rulesets: Chinese Official, Riichi, and Zung Jung

This article evaluates the rationale and coherence of the three widely recognized competitive mahjong rulesets—Chinese Official, Japanese riichi, and Zung Jung—across ease of learning, encouragement of hand building, strategic depth, and enjoyment and spectator appeal. Each dimension receives a score from 1 to 10, with the scores added for an overall assessment.

1. Ease of learning

Mahjong's basic rules are quite simple. Four players draw tiles and claim chows, pungs, and kongs, competing to arrange fourteen tiles into four sets—sequences, triplets, or kongs—and a pair. Someone entirely unfamiliar with mahjong can learn these basics in half an hour. However, this simplest form, in which any complete hand can win, offers too little entertainment and depth to be widely used for either casual play or competition. Regional Chinese variants and the three competitive systems all add to or modify these basic rules. “Ease of learning” here means the difficulty of learning a variant's special rules once the fundamentals are understood.

A game first needs people willing to play it; discussing the merits or enjoyment of rules that attract no players gets us nowhere. Competitive mahjong is no exception. Emphasizing competition cannot justify ignoring accessibility, or the game becomes a niche pursuit enjoyed by a tiny group without a wider player base. I also discuss this subject in The Two Tensions in Hand-Building Mahjong, Part II: Accessibility and Depth.

Chinese Official is the least accessible of these systems. Its 81 scoring patterns, high 8-point minimum, and more than thirty patterns worth less than 8 points create a huge variety of combinations for qualifying to win. A beginner must understand most patterns before even knowing whether a hand can win. This design considers variety and competitive play after the rules have been mastered, but presents a mass of patterns and combinations without a well-designed learning curve. It discourages most interested newcomers. Even twenty years after its introduction, Chinese Official remains a niche interest, unable to attract the hundreds of millions of Chinese players who already know basic mahjong. That must be considered a serious design failure.

Riichi's greatest advantage over Chinese Official is accessibility. Learning three or four common patterns, such as value honors, All Simples, and riichi itself, is enough to start winning hands; the rest can be learned through play. Yet it is easy to begin and hard to master. Its extremely complicated combination of han and fu makes scoring without a computer difficult for many players, greatly limiting opportunities for offline play. Special restrictions such as furiten, reduced values for open hands, and restrictions on swap-calling also impose substantial learning costs.

Zung Jung has the simplest rules, the fewest restrictions, and the most permissive winning requirements among these competitive systems. Any scoring pattern qualifies a hand, and its original rules even allowed wins without a scoring pattern. Its category-based addition principle produces some unconventional pattern values, but remains much simpler than Chinese Official's five scoring principles or riichi's fu calculation.

Scores for ease of learning: Chinese Official 1, riichi 4, Zung Jung 6, and basic any-hand-wins mahjong 10.

2. Encouragement of hand building

Even basic mahjong involves hand building: arranging fourteen initially disordered tiles into four sets and a pair. Hand building is therefore inherent to the game. Here, however, it means whether a ruleset encourages players to construct more beautiful, valuable hands instead of simply racing to win small ones. Mahjong's history has also been a history of expanding scoring patterns, from a handful such as Full Flush and All Pungs to the hundred or more found in later New Style rules. Plain any-hand-wins mahjong does not satisfy players. People enjoy constructing more attractive, valuable hands, making the game more entertaining to play and watch.

Chinese Official's greatest strength is its rich variety of patterns, assembled from many regional traditions. Its 8-point minimum also produces the most varied and complex ways of combining patterns to qualify. It best encourages hand building among these competitive rulesets. However, the 8-point base payment rewards racing for small wins and discourages building large hands, weakening this strength.

Riichi has over forty patterns, but riichi itself occurs in about half of winning hands, value honors in 40%, and Pinfu and All Simples in about 20% each. Other structurally distinctive patterns occur much less often. Roughly half of riichi wins are essentially concealed any-hand-wins mahjong with a riichi declaration; this does not encourage hand building.

Zung Jung describes itself as hand-building mahjong, yet Concealed Hand, All Chows, and All Simples account for 70% of wins even with a 5-point minimum. Allowing patternless wins would make high-value patterns even less frequent. Its hand-building routes are limited, and having no minimum or a low minimum further weakens the incentive to pursue them.

Scores for hand building: Chinese Official earns 8 for pattern variety, minus 1 because its base payment encourages quick wins, for a total of 7; riichi 3; Zung Jung 4; and basic any-hand-wins mahjong 1.

3. Skill and strategic depth

Skill in any mahjong ruleset has two components. First is general tile efficiency: completing four sets and a pair as efficiently as possible, a problem grounded in combinatorial mathematics. Second is skill specific to a ruleset, such as combining and improving scoring patterns in Chinese Official, or riichi decisions and defense in Japanese mahjong. Skills created by a particular set of rules apply to that system and cannot simply be transferred to another. This explains why players switching between riichi and Chinese Official struggle when they bring their usual tactics into the new game.

General tile efficiency and ruleset-specific skills carry different weights in different systems. Almost half of riichi wins involve riichi, whose concealed-hand construction depends entirely on tile efficiency. Value honors occur in 40%, while All Simples and Pinfu each occur in 20%. These small patterns impose few demands on the initial tiles and also depend mainly on efficiency. Thus, riichi skill largely consists of tile efficiency and related decisions, with large-hand construction playing only a small role. Chinese Official, by contrast, centers on building patterns, whether one major pattern or a combination of smaller ones. Patterns such as Mixed Shifted Chows, Mixed Straight, and Mixed Triple Chow each use three sets. Their tiles are largely fixed, often leaving a single-tile wait; only the remaining set and pair follow ordinary efficiency considerations. Tile efficiency therefore makes up less of Chinese Official's skill, while pattern construction and combination play a larger role.

Neither general tile efficiency nor ruleset-specific skills are inherently superior. Riichi's emphasis on efficiency does not make it more skillful than Chinese Official's emphasis on hand building. Otherwise, basic any-hand-wins mahjong, which relies entirely on tile efficiency, would have the greatest skill component. Tile efficiency is mathematical, and no human can calculate it as well as a computer. Yet rules based entirely on mathematics are simple and dull.

In my view, a mahjong ruleset's strategic depth lies in the variety of skills it adds beyond basic tile efficiency: the different decisions it introduces.

Chinese Official's 81 patterns give players a new dimension of choice: which pattern to pursue. Relationships among patterns create another dimension, involving combinations and transitions between them. The 8-point minimum and numerous small patterns create many further decisions about how to assemble a qualifying score.

Although tile efficiency dominates riichi, choosing between staying concealed for riichi and opening the hand to pursue other patterns is a key decision. Full discarder payment and furiten add a strong defensive emphasis and another layer of judgment. Hidden dora introduces a gambling element, but visible dora and red dora also create their own specialized strategies.

Zung Jung has simple rules, no minimum in its original form, and a moderate number of patterns. A major decision is whether to build a large hand or pursue Concealed Hand, All Chows, or All Simples.

This suggests that strategic depth is positively correlated to some degree with rule complexity. Each additional provision naturally creates ways to optimize play around it, adding another strategic dimension and more scope for study.

Scores for skill and depth: Chinese Official 7, riichi 8, Zung Jung 5, and basic any-hand-wins mahjong 1.

4. Enjoyment and spectator appeal

Enjoyment concerns the players, while spectator appeal concerns those watching. The two overlap considerably, and both draw on hand building and strategic depth. Stronger hand-building incentives allow players to produce more impressive hands, which are also more satisfying to watch. Greater strategic depth creates richer tactical play and lets spectators appreciate mahjong's competitive qualities.

Gambling elements are another major influence on enjoyment. Regional mahjong generally involves little hand building and often has simple, blunt rules, with enjoyment coming almost entirely from gambling. Changsha's “bird” draws and Guangdong's “horse” side bets, for example, multiply gains and losses through mechanisms outside the play of the hand itself. Riichi's hidden dora is of the same nature: a purely gambling element. Chinese Official and Zung Jung do not introduce such features. Chinese Official's triple self-draw may appear to amplify luck, but that is not what it actually does; see What Does “Triple Payment for Self-Draw” Really Mean in Chinese Official Mahjong?.

The soundness of the rules, including whether they contain loopholes, also affects enjoyment and spectator appeal. Even with a 5-point minimum, 70% of Zung Jung wins involve Concealed Hand, All Chows, or All Simples. This is monotonous for players and viewers alike, reflecting the excessive prevalence of these small patterns.

Two related concepts must be distinguished: overrewarding assigns a pattern far more points than its difficulty warrants, while overprevalence simply means that a pattern occurs very frequently. Overrewarding often causes overprevalence. Chinese Official's Mixed Shifted Chows, for example, has more tile combinations despite using three sets than Pure Double Chow has using two, yet its 6-point value is too high. It consequently appears in 25% of winning hands. But an overrewarded pattern need not become overprevalent: Big Three Dragons and Thirteen Orphans are also overrewarded in Chinese Official, yet remain too rare to dominate. Conversely, some reasonably valued patterns become overprevalent because of other rules, such as minimum scores or payment systems. Riichi itself and Zung Jung's Concealed Hand, All Chows, and All Simples are examples.

Loopholes encourage players to exploit an optimal shortcut: Mixed Shifted Chows in Chinese Official, riichi in Japanese mahjong, or Concealed Hand, All Chows, and All Simples in Zung Jung. Such shortcuts may improve results but greatly reduce enjoyment. They resemble cheat tools in a video game: initially satisfying because they make winning easy, but soon leaving players bored and eventually driving them away. For spectators, repeatedly seeing the same dominant patterns is a clear deterrent.

Thus, overrewarding and overprevalence detract from enjoyment and spectator appeal. With that in mind, consider each system.

Chinese Official's appeal comes from its strong hand-building element and the skills involved in constructing and combining diverse patterns. But incentives for quick, small wins and the prevalence of Mixed Shifted Chows and All Types reduce that appeal. Some advanced-player tables even prohibit Mixed Shifted Chows or raise the minimum to 16 points to exclude these dominant low-value routes. Its combined enjoyment and spectator-appeal score is 6.

Riichi involves little hand building, and its greatest excitement comes from revealing hidden dora after a riichi win, a purely gambling feature. Without hidden dora it offers little entertainment, which explains why the Japan Professional Mahjong League's competitive A rules, which remove ippatsu and hidden dora, attract little interest. Taking into account the prevalence of riichi, value honors, and similar patterns, riichi scores 6 for enjoyment and spectator appeal, or 2 under A rules.

Zung Jung offers moderate hand building and strategic depth, while Concealed Hand, All Chows, and All Simples are overprevalent. The game is relatively dull, giving it a combined score of 4.

The table below lists the four dimension scores and totals for the three competitive systems and basic any-hand-wins mahjong.

Dimension	Any-hand-wins	Chinese Official	Riichi	Zung Jung
Ease of learning	10	1	4	6
Hand building	1	7	3	4
Skill / depth	1	7	8	5
Enjoyment / spectator appeal	1	6	6	4
Total	13	21	21	19

Compared with basic any-hand-wins mahjong, each of the three competitive systems has strengths in learning, hand building, skill, and enjoyment, but none comes close to perfection.

Chinese Official offers many patterns, varied hand-building possibilities, and numerous ways to combine scores. Its weaknesses are a steep entry barrier that discourages newcomers, incentives for quick wins, excessive offense, and distorted pattern values.

Riichi's strengths are its competitive character and systematic, standardized rules. Its weaknesses are the gambling element of dora, numerous restrictions, and the passive defense encouraged by full discarder payment.

Zung Jung offers simple rules, reasonable pattern values, and accessibility. Its weaknesses are no minimum or a low minimum, insufficient strategic depth, and limited entertainment.