Discarder Liability Is Essential to Competitive Mahjong

Most directly adversarial sports and mind sports involve two sides: football, basketball, volleyball, tennis, table tennis, badminton, Go, Chinese chess, and chess are examples. Bridge has four players, but opposite players form partnerships, so it still involves two opposing sides. Events without direct opposition can have many competitors at once, generally competing to go higher, faster, or further. Athletics and swimming use objective measurements; gymnastics and diving use judges’ scores. Competitors can be ranked by their results.

Mahjong is unusual: its rules require four players, and a single player’s win ends the hand. Traditional mahjong strategy therefore centers on building one’s own hand quickly while delaying opponents’ wins—“watch the player upstream, keep an eye on the player downstream, and guard against the player opposite.” Mahjong is a race, combining attack and defense within direct competition. Many regional Chinese variants now prohibit chow calls or wins on discard. This fundamentally weakens mahjong’s strategy, interaction, and skill, reducing the game’s depth.

Directly adversarial competition necessarily involves both attack and defense. Without attacking ability, one cannot win, but basketball’s saying that “defense wins championships” also conveys the importance of defense. Chinese Official Mahjong encourages rushing to win small hands and gives defense almost no value. Japanese riichi’s full-discarder payments and emphasis on avoiding fourth place push defense to the opposite extreme, making play passive and conservative. Even so, mainstream competitive mahjong rules all recognize the discarder’s responsibility in their payment systems. Japanese full-discarder payment requires the discarder to cover all three losers’ shares. Chinese Official Mahjong combines base payments with self-draw tripling, with the other losing players paying only the base amount. Zung Jung shares small-hand payments and approaches full-discarder payment for large hands.

One argument now holds that mahjong should have neither discarder liability nor the concept of point transfers: only the winner should gain points, while the others lose nothing. First, giving the winner points without deducting any from the others is equivalent to a self-draw payment. Suppose A self-draws a 20-point hand. Under a usual payment system, A gains 60 and the other three lose 20 each. At the start of a half-round or full-round match, players receive starting points to avoid negative scores: 25,000 in Japanese mahjong and 500 in Chinese Official Mahjong. Adding 20 points to everyone produces the equivalent result of A gaining 80 while the others lose nothing. The difference between a transfer system and a gains-only scoring system is then merely terminology. But this gains-only system ignores discarder liability and treats every win as a self-draw.

Some point out that classical mahjong used dealer-double payments and had no concept of dealing in. That is true, but it already had special liability rules such as the “nine tiles of one suit” rule for Full Flush. Players were therefore not entirely unaware of responsibility for supplying tiles. Classical scoring centered on minipoints for kongs and pungs, with all four hands being scored, so pursuing discarder liability had little purpose. When mahjong moved from minipoints toward fan and introduced many scoring patterns, dealer-double payments soon became unsuitable. A major problem was that the dealer had to pay double even when someone else discarded the winning tile. This was unfair to the dealer. The discarder-double system emerged, replacing the dealer’s double payment with the discarder’s and the dealer’s double receipts with self-draw receipts. Since then, regional and competitive mahjong rules have explicitly recognized discarder liability, whatever payment system they use.

From a competitive perspective, without discarder liability, a player with a hand only one-sixth the value of an opponent’s could freely counterattack even when that opponent has three exposed melds of one suit toward Full Flush: any loss from dealing in would be shared among three players. This is unfair to the other two and turns mahjong into a game of mindless attack, reducing its strategic depth. Zung Jung describes its equal-share system, with no discarder liability, as more recreational but less competitive, suitable for family play. Its criticism of full-discarder payment is that the burden is too heavy, not that all liability should disappear. It finds a balance between equal sharing and full payment in its competitive system, sharing small-hand losses while placing the additional burden of large hands on the discarder.

Some argue that discarder liability follows from mahjong having only one winner. Yet Sichuan Blood Battle and Blood Flow variants, which allow further wins, also impose it. The same reasoning applies however many players win: a winning tile is either self-drawn or discarded by someone else. As long as the aim is to outscore the other players, avoiding discards that give opponents points remains a basic requirement.

As a four-player adversarial game, mahjong expresses its most basic defensive awareness through discarder liability. Liability is therefore an indispensable aspect of mahjong’s competitive character. It takes concrete form in each ruleset’s payment system.