Nagashi Mangan

Nagashi Mangan

Nagashi Mangan (流し満貫) is an optional special scoring rule in Japanese mahjong that awards a mangan payment when the hand reaches an exhaustive draw (ryūkyoku) under specific conditions.

Definition

Nagashi mangan is awarded to a player at an exhaustive draw when they have discarded only terminal and honor tiles throughout the entire hand, and none of their discards were called (claimed by other players). The player receives a mangan payment regardless of their hand composition at the time of the draw.

Detailed Explanation

Conditions for Nagashi Mangan

All of the following conditions must be met:

• The hand reaches an exhaustive draw (all tiles are drawn without anyone winning)
• The player has discarded exclusively terminal tiles (1s and 9s) and honor tiles (winds and dragons)
• None of the player’s discards were called by any opponent through pon, kan, or chi
• The rule is enabled (it is optional and not used in all rule variants)

Why This Rule Exists

Nagashi mangan recognizes the difficulty of maintaining a hand containing only simple tiles (2-8 of each suit) while discarding only terminals and honors. This requires careful tile management and strategic play. The rule adds an element of risk-reward gameplay, as players must decide whether to pursue this special condition or play more conventionally.

Important Distinctions

Nagashi mangan is only awarded at an exhaustive draw. If the hand concludes through a win (tsumo or ron), the standard scoring rules apply instead. Additionally, if even a single discard is called, the player cannot qualify for nagashi mangan, even if all subsequent discards are terminals and honors.

Application in Different Rule Sets

Nagashi mangan is particularly common in casual and regional play in Japan. It is not part of the official World Mahjong Organization (WMO) rules or most professional tournament rulesets. Players should always clarify whether nagashi mangan is being used before beginning play.

Usage Example

During a hand, East player discards in this sequence: 1m, 9m, 1p, 9p, 1s, 9s, East wind, South wind, White dragon, 1m, 9p, East wind, 9s.

None of these discards are called by opponents. The hand reaches an exhaustive draw with no winner. If nagashi mangan is in effect, East player receives a mangan payment from all other players, despite their hand potentially being incomplete or worthless by standard scoring.

Conversely, if during this same sequence an opponent called the second 1m discard with pon, East player would no longer qualify for nagashi mangan, and would receive nothing at the exhaustive draw.

Related Terms

Mangan (満貫) — A standard hand score worth 2,000 points for the discarder or 4,000 for the tsumo winner. Nagashi mangan provides this payment through a special condition rather than hand composition.

Draw (流局, ryūkyoku) — An exhaustive draw occurs when all tiles are drawn without any player achieving a winning hand. Nagashi mangan only applies in this scenario.

Terminal Tiles (ヤオチュー, yaochū) — The 1 and 9 of each suit (1m, 9m, 1p, 9p, 1s, 9s). These are the outermost numbered tiles and are essential to nagashi mangan qualification.

Honor Tiles (字牌, jipai) — The wind tiles (East, South, West, North) and dragon tiles (White, Green, Red). Along with terminals, these are the only tiles that may be discarded in a nagashi mangan hand.

Riichi (立直) — A declaration of being one tile away from winning. Riichi players sometimes pursue nagashi mangan as an alternative strategy if their hand becomes difficult to complete.

Noten (ノーテン) — The state of not being ready to win at an exhaustive draw. Nagashi mangan is one way a noten player can still receive compensation.