American Mah Jongg Rules — How It Differs from Chinese and Japanese Mahjong

The four rules that make American mah jongg a different game: 152 tiles with jokers, no sequences, a card that defines legal hands, and the Charleston pass before play begins.

If you learned mahjong from a Chinese or Japanese rulebook, American Mah Jongg will feel like a different game built from the same tiles. It is. Four rules separate them, and once you know those four, the rest follows.

1. There are 152 tiles, and 8 of them are jokers

A standard set is 144 tiles. American mah jongg adds 8 jokers on top, giving a 152-tile set.

The jokers are genuinely wild, but they are restricted in a way that catches almost every beginner:

• A joker may fill a group of three or more — a pung (3), kong (4) or quint (5).
• A joker may not be used in a pair.
• A joker may not replace a flower.

So a hand that calls for a pair of Red Dragons needs two real Red Dragons. Two jokers sitting in your rack will not do. This one restriction shapes every decision you make with a joker in hand.

Quints exist only because jokers exist. Five identical tiles is impossible from four natural copies — the fifth has to be a joker. That is why "quint" appears in American rules and nowhere else.

2. There are no sequences

This is the biggest structural difference. In Chinese and Japanese mahjong you build chows — three tiles in numerical order, like 4-5-6 of Bamboo. In American mah jongg, chows do not exist.

Every group in an American hand is a set of identical tiles:

• Pair — 2 identical
• Pung — 3 identical
• Kong — 4 identical
• Quint — 5 identical (only possible with a joker)

Because there are no sequences, a hand is a shopping list of specific tiles rather than a puzzle of connecting runs. It changes how you read a rack completely: neighbouring numbers are worthless to each other, and duplicates are gold.

3. You must match a hand on the card

In Chinese and Japanese mahjong, any legal arrangement of four melds and a pair wins. In American mah jongg, your hand must exactly match one of the hands printed on the current card.

The card is published annually and lists the only hands that are legal that year. A hand entry tells you the groups and how many points the hand is worth. If you have a beautiful 14-tile arrangement that is not on the card, it scores nothing.

This is why American players plan before the first discard. During the Charleston you are not just improving your rack — you are steering it toward one specific line on the card, and then abandoning it if the pass brings something better.

Our online version ships the same idea with a compact 12-hand card (hands worth 25 to 40 points, from Four Winds to a quint-based hand), so you can learn the mechanic without memorising the full annual list. Open The Card panel in American Mah Jongg to see which hands are live in your game.

4. The Charleston comes first

Before a single tile is drawn, everyone passes tiles.

• Mandatory Charleston: pass 3 tiles to the right, then 3 to the player across, then 3 to the left. Everyone passes simultaneously, so you receive three tiles after each pass.
• Optional second Charleston: after the first round you may take a second one, which runs in reverse — 3 to the left, 3 across, 3 to the right. If nobody wants it, play begins.

The Charleston exists because the card demands specific tiles. Nine tiles of forced exchange is what makes an unplayable rack into a playable one often enough to be worth the ritual.

One house-rule note: in tournament and most club play jokers may not be passed during the Charleston. Our online game does not enforce that, so you can pass a joker if you want to — but do not expect it to be legal at a real table.

How a round actually runs

• Four players, 13 tiles each. The dealer takes a 14th tile and discards first.
• On your turn: draw, then discard. If another player discards a tile that completes a group on your card, you may claim it — that is how pungs, kongs and quints get exposed.
• You win by completing a complete hand from the card. The game does not run to the end of the wall; the first valid hand ends it.
• If the wall empties before anyone completes a hand, the round is drawn.

There is no "riichi" declaration, no yaku requirement and no fan counting. Either your 14 tiles match a line on the card, or they do not.

American vs Chinese vs Japanese at a glance

• Chinese (MCR / traditional): 144 tiles, no jokers, chows allowed, no card, scored by fan patterns.
• Japanese (riichi): 136 tiles (flowers and seasons removed), no jokers, chows allowed, requires a yaku, scored with han and fu, has riichi and dora.
• American: 152 tiles with 8 jokers, no chows, hands defined by an annual card, preceded by the Charleston.