The short answer: 13 Orphans (Kokushi Musou in Japanese, 十三幺 in Chinese) is a Riichi Mahjong yakuman — the top scoring hand class. It holds one of each of the 13 terminal and honor tiles plus any duplicate, for 14 tiles total. It’s rare and pays the maximum points.
Somebody at your table wins with 13 Orphans and everyone goes quiet. It’s the most famous hand in Riichi Mahjong — a mess of odd singles that beats every set-based hand. Here’s what it is and why it scores so high.
What tiles make up 13 Orphans?
The name is the recipe: 13 different orphan tiles — the terminals and honors nobody wants — plus one extra tile to reach 14.
- All three 1 tiles: characters, bamboo, dots
- All three 9 tiles, one from each suit
- The four winds: East, South, West, North
- The three dragons: White, Green, Red
- One duplicate of any tile above, making 14
Why is 13 Orphans worth so much?
Because it’s a yakuman — the highest-scoring hand class in Riichi Mahjong. A yakuman pays the table’s maximum limit, often tens of thousands of points in one win. Only four copies of each tile exist, so collecting 13 different ones is hard.
- Keep every 1, 9, wind, and dragon you draw
- Stay closed — calling tiles blocks riichi
- Discard middle numbers until you commit
See the other big hands in our Riichi Mahjong rules guide, or start at zero with our what is mahjong explainer. No patience for rules? Play turtle mahjong instead.
Related Questions
What does yakuman mean?
Yakuman is Japanese for “full limit” — the top scoring class of hand in Riichi Mahjong. Hitting one wins the maximum points the table allows, often tens of thousands in a single win. 13 Orphans is one of these.
Is 13 Orphans played in American Mahjong?
No. American Mahjong, the NMJL card game, plays from a yearly card of named hands, and 13 Orphans isn’t on it. It’s a Riichi Mahjong rule all the way through.
What’s the Chinese name for 13 Orphans?
十三幺 (shísān yāo), which means “thirteen terminals.” Chinese Mahjong also counts it among the biggest wins in the game, and yāo covers every terminal and honor tile. It’s the same idea as the Japanese yakuman.