British Mahjong (BMJA) Rules

The rules most tables get wrong

British mahjong, codified by the British Mah-Jong Association, is a points game built on the same 136 tiles as riichi. It looks familiar to anyone who has played Hong Kong mahjong, and that familiarity is the problem: three of its rules differ from the Chinese game in ways that change how you build a hand, and one term — limit — is routinely confused with something else.

The one-chow rule

In British play you may chow a discard only once per hand. After that, no more chows for you this hand; pung and kong stay available.

The effect is strategic, not cosmetic. Chowing early commits you to a hand built mostly from concealed tiles, since the remaining sets must come from draws and pungs. Experienced players hold the chow in reserve and spend it on the set that is hardest to complete, not the first one offered.

It also changes defence. A chow tells the table that a player has spent their single allowance, so any further open set must be a pung or kong. Read that signal and you know which discards are dangerous.

The kong box

British play reserves tiles at the end of the wall as a kong box, and kong replacements are drawn from there rather than from the live wall. The convention is 14 tiles at the end of the wall, with the last few stacks left untouched so the box never empties mid-hand.

This matters because declaring a kong does not shorten the live wall the way it does in other styles. The hand simply continues, and the player who konged takes a replacement from the box, not the front of the wall. If you score by hand, note each kong on the sheet as it happens; reconstructing it later invites errors.

Scoring: hand points plus 20

British scoring totals the points for the patterns in your hand, then adds a base of 20 for the hand itself. Small patterns are worth little; the base is what makes even a modest win worth recording.

Component	What it covers	Notes
Pattern points	Pungs, kongs, dragons, winds, special hands	Added together, one score per completed pattern
Base	The hand itself	Always 20, regardless of shape
Ready bonus	Pre-declared wait	Doubles the total
Limit cap	Maximum payable in one hand	Agreed by the table before play

Because the base is fixed, the gap between a modest hand and a good one comes entirely from pattern points. That is the opposite of riichi, where the base fu and the doubling structure dominate the total.

Ready: the pre-declaration

British play allows a player to declare "ready" while waiting for the final tile. Once declared, the hand is frozen: you may not change tiles, and you must win on the tile you are waiting for. In exchange, the score doubles.

Ready is a commitment, not a hint. Declaring it tells the table you are one tile away, which in turn tells them exactly which discards to avoid. The doubling is real, but so is the information you hand over, and a ready declaration made too early is one of the most reliable ways to lose a hand you would otherwise have won quietly.

What "limit" means — and what it does not

British mahjong uses the word limit for a per-hand score cap agreed by the table. When a hand reaches that cap, it pays the cap and no more, and play continues.

This is not the same thing as the rating figure used in European tournament play, which is a ranking score with its own scale and its own name. The two numbers are unrelated, and mixing them up causes scoring disputes nobody can settle. If someone at the table says "limit 1000", ask which of the two they mean before the first hand, not after the last.

How British play differs from riichi

Feature	British (BMJA)	Riichi
Chow	Once per hand	Unlimited
Kong replacement	From a reserved kong box	From the dead wall
Dora	None	Indicator tile plus ura dora
Declared wait	Ready, doubles the score	Riichi, adds a yaku and a stick
Minimum hand	None; partial hands score	At least one yaku required
Scoring unit	Points, base 20	Fu and fan, doubling formula

The row that surprises riichi players most is the minimum hand: British play has no yaku requirement, so a hand with no special pattern at all can still be declared and still scores its base. There is nothing to check before calling mahjong, which makes the game easier to teach and less dramatic to watch.

Before your first hand

1. Agree the limit. Confirm the cap is a per-hand score and what value it has.
2. Confirm the kong box. Most tables use 14 tiles, but the number should be stated.
3. Decide on ready. Some clubs play it, some ignore it. Find out before the deal.
4. Check the score sheet. British scoring is manual, so the sheet is the record.

Quick answers

How many times can you chow in British mahjong?

Once per hand. Pung and kong are unlimited, but chow is a single-use allowance that most players save for a difficult set.

Where do kong replacements come from?

From a kong box reserved at the end of the wall, usually 14 tiles, so the live wall does not shorten when a kong is declared.

Is British limit the same as the tournament ranking score?

No. In British club play, limit is a per-hand score cap agreed by the table. Tournament rating scores are a separate system with a separate scale.

Do you need a minimum hand to win?

No. British play has no yaku requirement, so a hand with no pattern still scores its base of 20 points.