How to Read the American Mah Jongg Card During a Game
Reading the American Mah Jongg card means checking more than the numbers. You need to understand the size of each group, how the suits relate to one another, which tiles must be natural, and whether the hand permits exposures. Once those details are clear, you can compare your rack with a line on the card without guessing.
This guide covers play using the National Mah Jongg League card and rules. Use the edition your table has agreed to play, normally the current annual card. The hands change from year to year, so confirm the printed requirements even when a pattern looks familiar.
Decode the letters and numbers
The symbols identify the tiles required by a hand. Keep these basic meanings in mind as you read across a line.
| Marking | Meaning |
|---|---|
| 1 through 9 | Numbered tiles in dots, bams, or craks |
| F | A flower |
| N E W S | North, East, West, and South wind tiles |
| D | A dragon, with its identity determined by the hand and its notes |
| 0 | A white dragon, also called soap, used as zero |
| X beside a hand | Exposures are permitted |
| C beside a hand | The hand must remain concealed until Mah Jongg |
The number showing a hand's value is its base score, not another tile to collect. Read any instructions beside the pattern before deciding what belongs in your rack.
Flowers are interchangeable under NMJL rules. A flower's printed season, number, or illustration does not give it a numbered suit. Winds also have their own identities rather than belonging to dots, bams, or craks. A white dragon serving as zero is suitless; it does not become a numbered dot simply because white dragons are associated with dots when used as matching dragons. [1]
Read colors as relationships between suits
The card's colors show which numbered groups share a suit and which use different suits. Red ink does not automatically require craks, and green ink does not automatically require bams.
For example, suppose two numbered groups are printed in the same color. If you assign dots to the first group, you must also use dots for the second. If another numbered group appears in a different color, it needs a different suit, subject to the hand's notes.
Treat this as an assignment you make for the whole hand. You cannot use the same printed color to mean dots in one group and bams in another just because that fits your tiles.
When a hand calls for matching dragons, dots go with white dragons, bams with green dragons, and craks with red dragons. Opposite dragons are nonmatching dragons; use the colors and notes to determine the permitted choice. Flowers, winds, and a soap used as zero do not create an additional numbered suit. [1], [2]
Count identical tiles rather than printed characters
A pair contains two matching tiles, a pung three, a kong four, a quint five, and a sextet six. These group sizes matter both when planning your hand and when deciding whether you can call a discard.
Four adjacent symbols are not necessarily a kong. NEWS requires four different winds. A year grouping containing different tile identities is also not a set of four identical tiles. Do not treat either grouping as one exposable kong.
Jokers can fill positions in pungs, kongs, quints, and sextets. They cannot replace singles or tiles in pairs. For example, two natural 8 bams and a joker can form a pung of 8 bams. One natural 8 bam and a joker cannot form a pair. The restriction also applies to singles and pairs printed close together in a longer sequence. [2], [3]
Check the note before choosing numbers
A printed pattern may allow any like numbers, a run beginning with different numbers, or only the specific numbers shown. The parenthetical instructions tell you which choices are allowed.
If a hand permits any like numbers, choose a number that satisfies that hand's complete pattern. If it permits consecutive numbers, preserve the required spacing and order when choosing a starting point. If the note limits the hand to the printed numbers, use those numbers exactly.
Do not combine the favorable parts of two different lines. The pair from one hand and the kongs from another do not become a legal hand merely because they total fourteen tiles.
Understand what X and C allow
An X hand allows you to claim a discard for a permitted exposure. You may also finish an X hand without making any exposure.
A C hand cannot have exposures before Mah Jongg. You may claim another player's eligible discard when that tile completes the entire concealed hand. Concealed does not mean jokerless: jokers are still allowed in the appropriate groups, but never in singles or pairs. [2]
For either kind of hand, you cannot call a discard merely to add an unfinished single or pair to your rack. The exception is when that tile completes Mah Jongg. Knowing this changes how you evaluate a missing pair: you cannot build it by calling its second tile early in the hand. [2]
Use a short reading routine at the table
When considering a line, read it in this order:
- Identify the tile groups and their sizes.
- Assign the suits and any required dragons.
- Read the note for number choices and exceptions.
- Check X or C before planning a call.
- Match your natural tiles, then place jokers only in eligible spaces.
Before declaring Mah Jongg, repeat the check with all fourteen tiles, including your exposures. A useful practice exercise between games is to choose one hand and explain each group aloud: its number or tile type, suit, size, and joker eligibility. This exposes misunderstandings before a discard forces a quick decision.