Official Definition & Core Meaning
A meld of exactly four identical tiles in suit and rank, formed naturally or with Jokers.
Understanding the precise mechanical definition of Kong (4 of a Kind) 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
A Kong is a set of four identical tiles (for example, four North Winds, or two 4-Dots and two Jokers). Unlike Chinese Mahjong—where a 4-of-a-kind Kong requires drawing a replacement supplement tile—in American Mahjong a Kong simply counts as 4 of your 14 total hand tiles.
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 Kong (4 of a Kind) must follow clear spoken announcements and precise tile placement.
Real Table Scenario & Spoken Dialogue
Playing the 2468 section (FF 222 4444 666 88), you hold two 4-Craks and a Joker. When East discards a 4-Crak, you call it and expose 4-Crak, 4-Crak, 4-Crak, Joker on your rack as your 4-tile Kong.
Common Beginner Mistake & Dead Hand Risk
Drawing an extra replacement tile from the back of the wall after exposing a Kong (a habit from Chinese/Riichi Mahjong that immediately causes a 15-tile Dead Hand in American Mahjong!).
Official NMJL Tournament Rule vs. Casual House Rules
Official NMJL Rule: You can NEVER "upgrade" an already exposed Pung (3 tiles) into a Kong (4 tiles) later in the game. Once a meld is exposed on the rack, its size is locked.
Official Rule Reference: NMJL Rules §Melds: "A Kong is 4 identical tiles and counts as four tiles toward your 14-tile hand."
Strategic Pro Tip: Exposing a Kong with two or three Jokers early in the game turns your rack into a "Joker bank" for opponents holding the matching natural tile.
Related Glossary Terms & Reference Links