Japan's professional mahjong league opens: seat positions and luck at the table

Last night I watched the opening broadcast of Japan's professional mahjong league, M League, and the commentator mentioned that players take a look at their seat before sitting down. I heard the same sort of lines at the table as a child — "don't sit by the door", "keep your back to a wall" — and the people saying them mostly did not mean it, but nobody was willing to try a different seat either.

What this league actually is

The M League 2026-27 season opened on 14 September, broadcast on ABEMA; from 21 September the regular season will run two tables at once on each match day. It is positioned like a professional sports league: fixed teams, sponsors, a regular season and a final, and teams even carry corporate names. In other words, mahjong here is a serious profession with a schedule, statistics and commentary.

There is more than one account of when and where mahjong took shape; a fairly common one holds that it evolved from card games around Ningbo in the mid-nineteenth century. From cards to tiles, from teahouses to streaming platforms, its rules have been rewritten many times — only the word "luck" has stayed at the table.

Seat conventions at the table

Feng shui talks about orientation, and the mahjong table happens to be an occasion all about orientation. The folk sayings fall roughly into these kinds:

• Have something at your back: a wall behind you is more reassuring than a door behind you, and this is called "having backing".
• Don't sit by the door: air moves at the doorway, and that is taken as "wealth that will not stay".
• Don't change seats lightly: switching seats when your luck is bad belongs to the "shake it up a bit" psychology; people whose luck is good are naturally even less willing to move.
• Little habits in shuffling and drawing: some people always draw with the same hand, some never count the tiles; a set of moves practised until it becomes like ritual.

None of these conventions has anything to do with probability. Where they actually do something is in the emotional management of the table: four people sitting opposite each other for hours need a stable frame in which to place the wins and losses they cannot control.

The league has more rules than the game

Watch one broadcast and you see that professional mahjong has almost nothing to do with "calculating luck": seats are decided by drawing lots before play, a tile is called before it is drawn, one wrong move is penalised on the spot, and after a match every choice is reviewed. What makes a player valuable is not feel, but decisions that can be repeated.

This order actually grew out of folk tables. Chinese mahjong has a few unwritten rules: conduct matters more than the score — "don't gloat when you win, don't curse when you lose"; don't rush another player; keep family matters off the table. Their function is straightforward: four or five hours at one table is survived not by the tiles, but by getting along.

How "luck" gets calculated

Professionals do not talk about luck; they talk about tile efficiency, expected value and reading the situation. Repeat the same move tens of thousands of times and the chance of guessing right on instinct is squeezed very low; those who win win on decisions, not on feel.

But the word "luck" will not disappear. It compresses a run of random outcomes into something that can be talked about: brought out as a joke when you win, used as a step down when you lose. Many folk sayings survive in the same way — not because they are accurate, but because they are useful.

Treating it as a language

I later boiled the table conventions down to one line: they are not predictions, they are a language that lets luck be discussed. You can absolutely refuse to believe in them, but you will notice that people who know this language often sit down more relaxed.

If you too are currently turning over and over something whose outcome is not yours to decide, write down what you care about and read it again after a while; you will often see what you were really tense about at the time.

Information in this article is current as of 15 September 2026; the schedule and broadcast arrangements are subject to the league's official announcements.

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Sources

• PR TIMES, 〈Mリーグ2026-27シーズンの概要について〉 (opens 14 September, two tables running at once from 21 September): https://prtimes.jp/main/html/rd/p/000000218.000035640.html (accessed 15 September 2026)
• M League official site, 〈Mリーグ2026-27シーズン、ドラフト会議を「ABEMA」にて生放送決定〉 (broadcast platform is ABEMA): https://m-league.jp/news202606181200 (accessed 15 September 2026)
• KONAMI arcade game news, 〈「KONAMI麻雀格闘倶楽部」が「Mリーグ2026-27シーズン」に出場〉 (14 September 2026): https://www.konami.com/arcadegames/corporate/ja/news/release/2026/0914/ (accessed 15 September 2026)
• Japan Professional Mahjong League, 「規程」 (rules page of the Japanese professional mahjong industry organisation): https://www.npm2001.com/rule/ (accessed 15 September 2026)
• Wikipedia, "麻将" (the various accounts of its origin and development, further reading): https://zh.wikipedia.org/wiki/麻将 (accessed 15 September 2026)