American mah jongg and Japanese riichi look like relatives and play like strangers. Different tile sets, different scoring, different tempo. One has jokers and an annual card; the other has dora, yaku and a profession built around it.
But Japan has spent decades turning mahjong into a studied discipline, and there is a great deal in it that an American player can use. The trick is knowing what transfers and what does not.
What does not transfer
Start here, because importing the wrong idea is worse than importing nothing.
Yaku do not exist in your game. Riichi scoring is built on hand patterns you must construct before you can win. American scoring is a fixed value printed on a card. Everything the Japanese literature says about building toward a yaku is noise in your game.
Dora do not exist either. There are no bonus tiles adding value to your hand. Your hand is worth what the card says.
Riichi itself — the open declaration of a ready hand — has no counterpart. You cannot buy a doubling stake by announcing readiness. Do not try to invent one at your table.
What does transfer is everything that does not depend on the scoring system: how to judge when to fight and when to fold, how to count your outs, how to read what the table has given up, and how to think about a hand as a set of probabilities rather than a wish.
The central idea: push and fold
If you take one thing from the Japanese game, take 押し引き (oshi-hiki) — the push/fold judgment.
In riichi, a great deal of professional literature is devoted to a single question: at this moment, is my hand worth continuing with, given what I now know about the other three players? Everything else — tile efficiency, reading, safe-tile selection — serves that question.
The American game has the same question and almost no vocabulary for it. Players commit to a hand in the Charleston and then ride it to the end, whether or not the table has moved underneath them. The Japanese would call that a failure to fold, and it is the most expensive habit in both games.
Here is the translation. Ask yourself, at roughly the midpoint of every hand:
- How many tiles do I still need?
- How many of those are plausibly still live?
- Is anyone else visibly close?
If the answer to the third question is yes and the first answer is three or more, you are not playing to win any more. You are playing to not lose. That is not a failure — it is the correct read, and the players who work it out are the players who stop paying.
Tile efficiency, without the Japanese names
The Japanese call it 牌効率 (hai kōritsu), and the underlying question is simple: which discard leaves me able to use the most tiles?
Take a rack holding 3-4-5 of dots plus a lone 8 of dots. A run hand wants the 3-4-5; the 8 is dead weight. But if your card line needs a pung, the 8 is one of four copies and the 3-4-5 is three unrelated tiles. Same tiles, completely different answer, and the answer comes from the card — not from the tiles.
This is where the American game is genuinely harder than riichi. In riichi, tile efficiency has a stable answer that does not change with the season. In your game the right discard depends entirely on which line on the card you are playing, which is why picking your line early is not pedantry. It is the thing that makes every subsequent discard computable.
What the professionals actually emphasise
Three quotations, each of which survives checking, and each of which says something an American player can use.
On superstition. Go Kobayashi (小林剛), one of the most published strategy writers in the Japanese game, built his reputation on what he calls "digital" mahjong — probability-based, explicitly rejecting what he calls occult theories of the game. His position in the preface to Super Digital Mahjong is that he will not discuss unscientific reasoning, and that the outcome of one hand does not predict the next.
"I will not talk about unscientific, occult theories… the events of the next hand of mahjong cannot be predicted by the events of the previous hand."Go Kobayashi (小林剛), preface to Super Digital Mahjong. English translation via natsuai.com/mahjong/digital/chapter-0.
This is worth internalising, because the American table is full of inherited superstition: lucky seats, unlucky tiles, the belief that a table "owes" you after a bad run. It does not. Each deal is fresh.
On balance. Takaharu Ooi (多井隆晴) is the only holder of RMU's highest licence rank, a five-time RMU titleholder, and captain of the Shibuya Abemas in M.League. Asked to describe his own style:
"I consider myself to be a well-balanced player with slightly more emphasis on defense."Takaharu Ooi (多井隆晴), interviewed by Jenn Barr, ReachMahjong.com.
Note the phrasing: slightly. Even a player famous for aggression describes himself as balanced with a defensive lean. The stereotype of the attacking professional is mostly a television product.
On overthinking. Akina Mizuhara (瑞原明奈), the 2021-22 M.League MVP and a two-time team champion, was asked about "gorilla mahjong" — a blunt, unsubtle style:
"There are quite a few situations in mahjong where insensitivity is crucial. Overthinking things can sometimes cause hesitation."Akina Mizuhara (瑞原明奈), FRIDAY DIGITAL, 2024 (English edition: en.friday.news).
That is a genuinely useful corrective for the American game. The card offers several hundred lines and the temptation is to keep re-evaluating all of them. Most of the time the correct play is to pick the line, commit, and stop second-guessing.
A note on quotation, and why we are fussy
Mahjong attracts misattribution more than most games. Search for professional mahjong quotations and you will find thousands of lines with no source at all, a great many drawn from manga and anime — Akagi, Saki — whose characters are fictional, and a long list of sayings attached to real players who never said them.
We have deliberately left out several well-known quotations for exactly this reason, including a widely repeated line attributed to Ooi ("if you want to win in mahjong, then you should not want to win in mahjong") that we could not trace to any recording. It may well be real. Until someone can point at the clip, we are not printing it as his.
If you take one habit from this article, let it be that one: ask where a quotation came from. It is the same discipline as asking where a rule came from, and it is what separates a game you understand from a game you have been told about.
Where to read next
For English-language riichi material, Riichi Book I by Daina Chiba is free and is the standard reference; riichi.wiki is the best terminology and strategy resource in English. Both are useful to an American player precisely because they explain the reasoning rather than the scoring — and the reasoning travels.