American Mahjong vs Chinese Mahjong Rules

Mahjong reached the United States in the 1920s, and the people who took it up did not simply learn the Chinese game. They rebuilt it. By the time the National Mah Jongg League was founded in 1937, American Mahjong had its own tiles, its own winning hands, and its own vocabulary.

The result is two games that share a box of pieces and almost nothing else about how those pieces are used. If you are equipping a table — or buying stock for a shelf — that gap is the whole ballgame. The wrong set for the wrong player is a return waiting to happen.

Here is what actually changes.

The short answer

	Chinese Mahjong	American Mahjong
Tiles needed to play	144	152
Jokers	none	8, used as wild tiles
Flowers and seasons	8 bonus tiles, set aside	8, still bonus tiles
Chows (runs)	yes	none at all
Winning hands	fixed patterns, stable for decades	an annual card that changes every year
Tile passing	none	the Charleston, every hand
Typical tile size	compact and thin	30–33 mm, thick enough to stand in a rack
Racks	rarely used	four racks, one per player

The one-line version: American Mahjong is the 144-tile game plus eight Jokers — and then a set of rule changes that make it play like a different game entirely.

The tiles: 144 versus 152

Both games are built on the same core, which is why people assume they are the same game.

The shared 136

• 108 suited tiles — three suits (Bams, Dots, Craks), each running 1 to 9, four copies of every rank
• 28 honour tiles — four winds (East, South, West, North) and three dragons (Red, Green, White), four copies of each

That is 136 tiles, and it is identical in both games.

Where Chinese adds 8

Chinese Mahjong adds the flower and season tiles: four flowers, four seasons. They are not part of any hand’s structure. Draw one and you set it aside as a bonus and draw a replacement.

136 + 8 = 144, which is the standard Chinese set. (Japanese riichi drops the flowers again and plays the 136.)

Where American adds 8 more

American Mahjong keeps the flowers — and then adds eight Jokers.

Jokers are wild. They substitute for most tiles in most hands, which is why a set that arrives with seven of them is not a set you can play the card with properly.

136 + 8 flowers + 8 Jokers = 152.

The professional term: the 152 is the playing set. Sets sold in the US usually ship as 166, because makers include 14 spare tiles so a single loss does not retire the whole set. We break that down separately in how many tiles an American Mahjong set has.

The physical difference nobody mentions

The games do not just use different counts. They use different tiles.

Chinese tiles are compact and thin — built to be shuffled face-down into a wall and held in the hand. American tiles are chunky by comparison: 30 × 23 × 13 mm as standard, running up to 33 × 25 × 15 mm, because an American tile has to stand upright on its edge in a rack for an entire evening.

That thickness is not decoration. It is what the rack is milled to hold, and it is the single most common way a wholesale order goes wrong — covered in the tile size guide.

The rules: five things that actually change

1. There are no chows

Chinese Mahjong: a chow is a run of three consecutive tiles in one suit — 4-5-6 of Bamboo. It is usually claimable only from the player seated to your left.

American Mahjong: chows do not exist. You build pungs (three of a kind), kongs (four of a kind) and pairs.

This one change rewrites the game. A Chinese hand is often assembled from runs; an American hand is matched, tile for tile, against a list. Players who move between the two games consistently describe the American version as feeling more like collecting than building.

2. Jokers are wild — and sometimes banned

Chinese Mahjong has no Jokers at all. In American Mahjong they are wild in most hands, but a handful of hands on the card forbid them outright.

The practical consequence for a buyer is simple: the Joker count is the number to verify on delivery. Eight is correct, and Jokers are the tiles that go missing most often.

3. The Charleston

American Mahjong opens with a mandatory tile-passing phase: every player passes three tiles, three times, in alternating directions, before a single tile is drawn from the wall.

Chinese Mahjong has nothing like it. The Charleston exists to break up the luck of the deal and get four players moving toward the card immediately — and it is, for many American players, the most social part of the game.

4. Winning hands come from an annual card

Chinese Mahjong is learned once. The winning shapes have been stable for a century — typically four groups plus a pair, on top of a minimum fan or point requirement.

American Mahjong is learned annually. The National Mah Jongg League publishes a new card every spring listing that year’s winning hands, and everyone at the table plays from the same list. If you are new to it, how to read the NMJL card walks through the structure.

In plain terms: Chinese Mahjong is a rulebook you memorise. American Mahjong is a season you keep up with.

5. Scoring works on a different basis

Chinese mahjong scores by pattern — flushes, all-triplet hands, seat winds and so on — and the major rulesets impose minimums (Hong Kong by fan value, Chinese Competition Rules at eight points).

American Mahjong scores straight off the card. Every hand listed carries its own value, so the card is simultaneously the rulebook and the scoreboard.

Why the two games diverged

The split is not a misunderstanding. It is a deliberate adaptation.

Mahjong was exported to the United States in the 1920s as a commercial craze, and the American version was shaped by the people playing it: clubs and social groups who wanted a faster game with more interaction and less calculation. Jokers, racks, the Charleston and the annual card all came out of that pressure.

The National Mah Jongg League standardised the result in 1937, and it has stayed distinctly American ever since. Chinese Mahjong went the other way — toward competition, with the Chinese Official rules codified for tournament play.

Two games, one ancestor, opposite instincts.

What this means when you are buying

This is where the difference stops being trivia and starts costing money.

Never assume one set serves both markets. It is the most common wholesale error in this category, and it fails quietly — the carton looks right, the tile count on the box looks plausible, and the problem only surfaces when a player sits down and cannot find eight Jokers.

Buying for	Order
US retail, clubs, senior communities	152-tile playing set, shipping as 166, 30 mm and up, colour-filled engraving, racks matched to tile thickness
Chinese, Hong Kong or general play	144 tiles, compact size, racks usually unnecessary

For US stock, the things that actually decide whether an order succeeds are the tile count, the tile size, and whether the rack matches the tile thickness. How to choose between the five colorways covers what we keep in production, and if you are ordering by the carton rather than the set, buying mahjong sets in bulk covers mixed cartons and what to verify on delivery. If your customers are gift buyers rather than players, choosing a set as a gift is the one to send them.

Which one should you learn?

If you are in the United States, learn American Mahjong. It is what the people around you are playing, and the card is the only thing standing between you and a table.

Learn Chinese Mahjong or riichi if you travel to Asia, play online, or want a game you can learn once and keep for life.

And if you already play one: the tiles transfer, the reflexes do not. The chow you reach for does not exist in the American game, and the card you memorised last year has already changed.

Start with the tiles, then the rules

The confusion people feel between these two games is almost always a tile confusion wearing a rule costume. Get the counts straight — 136 shared, 144 for Chinese, 152 for American — and most of the rest falls into place.

If you are starting from zero rather than comparing, mahjong rules and tiles covers the vocabulary and the shared framework both games are built on.