American Mahjong Rules: Mastering the NMJL Card and Jokers

American Mahjong is a social, four-player strategy game governed by the National Mahjong League (NMJL) that uses a standardized annual card of winning hands, jokers, and a unique tile-passing ritual called the Charleston. Unlike single-player tile-matching apps found on phones, this is a complex game of skill, calculation, and tactical social interaction.

Understanding the American Mahjong Difference

If you have seen "Mahjong" on a computer or smartphone—where you click two identical tiles to remove them from a stack—you are playing Mahjong Solitaire. That game is a puzzle, not the traditional four-player strategy game.

American Mahjong, specifically, is a distinct variant developed in the early 20th century. While it shares the same beautiful, ivory-like tiles as Asian variants, it differs significantly in its mechanics. The most defining feature of American Mahjong is the NMJL card, which dictates the specific combinations of tiles you must collect to win. This card changes every year, keeping the game fresh and challenging for veteran players.

The NMJL Card and Your Goal

In American Mahjong, you are not just trying to make any "legal" hand. You are racing to complete one of the specific patterns printed on the official NMJL card. You can purchase this card annually from the National Mahjong League; it is the "bible" for your game.

When you sit down to play, you look at your starting tiles and scan the card to see which hand has the most potential. Because the card is fixed, you aren't just playing against your opponents; you are playing against the probability of drawing the specific tiles required to complete your chosen hand. If you aren't sure where to start, our how-to-play-american-mahjong page offers a deep dive into reading the card.

The Charleston: The Opening Ritual

One of the most exciting aspects of American Mahjong is the "Charleston," a mandatory tile-passing ritual that occurs at the beginning of every game. During the Charleston, players pass unwanted tiles to their neighbors in a specific sequence (Right, Across, Left).

This phase allows you to "shape" your hand, discarding tiles that don't fit your chosen pattern on the card and potentially receiving better ones. It is a game of intuition—do you pass a tile that might help your neighbor? Strategic passing is a hallmark of a skilled player. Once the Charleston is complete, there is a final "courtesy pass" where you may choose to exchange up to three tiles with the person sitting across from you.

Jokers: The Game-Changer

Jokers are a unique element of American Mahjong that adds a layer of excitement. A Joker can be used to represent any tile in a "pung" (three of a kind), "kong" (four of a kind), or "quint" (five of a kind) group.

However, there is a catch: if you use a Joker in a set, it is "locked." If an opponent later discards the actual tile that the Joker is replacing, they can call "redeem," swap their real tile for your Joker, and put the Joker into their own hand. Mastering when to use your Jokers—and when to hold them—is vital for preventing your opponents from stealing your advantage.

Table Etiquette and Social Play

American Mahjong is deeply social. Unlike the quiet focus of Japanese Riichi, American Mahjong is often played with conversation and light banter. However, there is a strict etiquette to maintain the flow of the game:

• The Call: When you need a discarded tile to complete a set, you must say "Call" clearly before the next player touches their tile.
• The Rack: Keep your tiles neatly arranged on your rack so they are visible to you but hidden from others.
• Speed: Try to play at a steady pace. If you are a beginner, it is perfectly acceptable to ask for a moment to check your card, but try to keep the game moving for the sake of the table.

If you are looking for people to play with, check out our directory of mahjong-clubs to find a group in your area that welcomes beginners.

Frequently asked questions

Do I need to memorize the NMJL card?

No, you do not need to memorize it. In fact, you are expected to have your official NMJL card in front of you during the entire game. The skill lies in analyzing the card to determine which hand your tiles are trending toward, not in rote memorization of the patterns.

Can I use a Joker to complete a pair?

No. In American Mahjong, Jokers can only be used to complete sets of three or more identical tiles (pungs, kongs, quints, or sextets). You cannot use a Joker to complete a pair or a single tile requirement. Always check the current year's card for specific hand constraints.

Why is American Mahjong different from Chinese Mahjong?

American Mahjong was adapted in the 1920s to include more complex hand patterns and the use of Jokers to increase the game's difficulty and tactical depth. While they share the same tiles, the rules for winning, scoring, and the inclusion of the Charleston make American Mahjong a unique, distinct experience.

Is Mahjong Solitaire related to the real game?

No. Mahjong Solitaire is a computer puzzle that uses the tiles as decorative icons. It does not involve the strategy, social interaction, or the four-player rules that define actual mahjong. If you want to learn the real game, you should focus on learning the rules for a specific variant like American or Riichi.

Ready to get started? Find a partner or a local group and try playing your first practice round today.