Official Definition & Core Meaning
Twelve honor tiles comprising Red Dragon (中), Green Dragon (發), and White Dragon (Soap / 0).
Understanding the precise mechanical definition of Dragons (Red, Green, Soap / White) is critical for competitive American Mahjong and sanctioned NMJL tournament play. Confusion surrounding this term often leads to table disputes, accidental dead hand declarations, or missed scoring opportunities.
Exhaustive Rule Analysis & Mechanics
American Mahjong uses 12 Dragon tiles (4 Red, 4 Green, 4 White/Soap). Each Dragon has a fixed "matching suit": Red Dragon matches Craks, Green Dragon matches Bams, and White Dragon (Soap) matches Dots. When the card prints "D" in the same color as a number suit, you use that suit's matching Dragon; when printed in a different color, you use an opposite-suit Dragon. Additionally, White Dragon (Soap) universally represents the digit "0" in Year Hands (2026).
During live play, adhering to standard table procedures ensures that all participants have equal opportunity to react to discards, verify calls, and inspect exposures according to the official rulebook. Every action involving Dragons (Red, Green, Soap / White) must follow clear spoken announcements and precise tile placement.
Real Table Scenario & Spoken Dialogue
A card line reads "111 222 3333 DDDD" printed entirely in green (1-suit). If you build the numbers in Bams, your "DDDD" Kong must be four Green Dragons. If you build the numbers in Dots, your "DDDD" must be four White Dragons (Soaps).
Common Beginner Mistake & Dead Hand Risk
Using a Joker for the White Dragon "0" inside a single-digit "2026" grouping, or mixing up which Dragon belongs to which suit (remember: Red = Craks, Green = Bams, White Soap = Dots).
Official NMJL Tournament Rule vs. Casual House Rules
Official NMJL Rule: When Soap (White Dragon) is used as a Zero (0) inside a single-digit "2026" block, it is suit-neutral and cannot be replaced by a Joker. When used in a Pung (000) or Kong (0000) of Zeros, Jokers ARE allowed.
Official Rule Reference: NMJL Rules §Dragons: "Red = Craks, Green = Bams, White (Soap) = Dots and Zero (0) in Year hands."
Strategic Pro Tip: On the 2026 card, White Dragons (Soaps) are doubly scarce because players hoard them both as "0" for 2026 hands AND as the matching Dragon for Dots.
Related Glossary Terms & Reference Links