The short answer: a mahjong card is the yearly list of winning hands published by the National Mahjong League. In American mahjong you can only go out on a hand that appears on the card, which is why the card is the most important thing on the table.
Ask any American mahjong player what makes the game different, and they will point at the card. Chinese players learn their winning hands once and keep them forever. Americans get a fresh printed list every year. That folded paper is the heart of the game.
What exactly is on the mahjong card?
The card is a compact rulebook for winning, written in shorthand:
- A list of hands arranged in columns, with each line showing one winning hand in letters and numbers.
- Suit abbreviations you learn in five minutes: D for dots, B for bamboos, C for characters, plus the wind and flower symbols.
- Sections that rotate every year, so the same card never appears two seasons in a row.
- A special hand unique to that year, which players love to chase for its big score.
Why do I need the card to win?
- The National Mahjong League designs a new card every spring.
- Your club adopts it, usually around April 1st.
- From that day, every winning hand at the table must match a line on the card.
- No card, no win — that is the biggest difference between American mahjong and the Chinese version, and it keeps the game fair for everyone.
The card is not hard to read once you know the code. New to the game? Our what is American mahjong overview explains how the card shapes the whole game, and our how to play American mahjong guide covers the rules. Then practice in our free American mahjong game.
Related Questions
Do Chinese mahjong players use a card too?
No. That is the key difference. Chinese rules use a fixed set of hands that every player learns once. The annual card is an American invention.
Is the card the same everywhere in America?
The NMJL card is the standard, and most clubs follow it. Some tournaments use alternative rule sets or cards, so check what your club plays before you practice.
How long is a card valid?
One season, roughly from April 1st to the following March 31st. When the new card appears, the old one becomes a collector’s item.
Can I win with a hand that is not on the card?
In standard American mahjong, no. The card defines every legal winning hand, so building toward a hand that is not listed is the quickest way to lose.