Decrypting the Code: How to Read the American Mah Jongg Card

You've built your walls, you've dealt your tiles—now what? 

Unlike other versions of Mah Jongg, the American game hinges entirely on one annual document: The National Mah Jongg League (NMJL) Card. It's worth noting that a few other boutique Mahjong companies are coming out with their own version of the playing card. 

The card might look like a colorful mystery at first glance, but it's organized logically into different sections that dictate every possible winning combination of 14 tiles.

Understanding the Categories

The NMJL Card is broken down into approximately 10 main categories, each containing several hands based on a common theme. Some of these include:

Consecutive Run: Hands using numbers in sequential order.

2468: Hands that use only even-numbered tiles.

13579: Hands that use only odd-numbered tiles.

Quints: Hands requiring five identical tiles, which almost always require a Joker.

Winds and Dragons: Hands built around the compass (N, E, W, S) and the three Dragon tiles.

Singles and Pairs: Unique hands that cannot use Jokers and are built exclusively of single tiles and pairs.

The Color Code: Suits in a Hand

The key to reading the card is understanding the color-coding. The colors do not tell you which suit to use (Dots, Bams, or Craks); they tell you how many different suits you need for that specific line:

All One Color (e.g., Blue): All numbered tiles in that line must be ONE suit (e.g., all Bams).

Two Colors (e.g., Red and Green): The hand requires TWO different suits (e.g., Dots and Cracks).

Three Colors (e.g., Red, Green, and Blue): The hand requires THREE different suits.

Important Exceptions: Winds, Flowers (F), and the White Dragon (when used as a zero or Soap) are generally treated as suit-neutral and are usually printed in one consistent color, regardless of the suit changes in the rest of the hand.

Exposures and Concealed Hands

Look to the far right of each hand on the card for a letter next to the point value:

X (Exposed): You can call (claim) a discarded tile from another player to form a set (Pung or Kong) and expose those tiles on your rack. Most hands on the card are 'X' hands.

C (Concealed): You must draw all your tiles from the wall. You may only call a discarded tile if it is the 14th and final tile needed to declare Mah Jongg (win).

Once you can translate the card's language, you can move into the strategy of the game, starting with the crucial tile-passing process—the Charleston!