Riichi Mahjong · Yakuman

Tsuuiisou (All Honors) in Riichi Mahjong: Rules, Seven Pairs Form, Examples and Odds

In riichi mahjong, Tsuuiisou (all honors) is a yakuman: every one of the 14 winning tiles, called sets included, is an honor — East, South, West, North, white, green or red dragon — with no suited tiles at all. It stays a yakuman when called, and the chiitoitsu shape with seven different honor pairs counts too.

The rules for Tsuuiisou

• All 14 tiles are honors: winds (East, South, West, North) and dragons (white, green, red)
• Either four triplets or quads and a pair, or seven pairs of the seven honors
• A yakuman closed or open
• Honors can't be called by chi, so the regular shape is always four triplets (or quads) and a pair

One suited tile and it isn't tsuuiisou: a hand that falls just short usually ends up as honitsu with yakuhai and toitoi.

How Tsuuiisou is scored

The yaku and points below are computed live by the same scoring code the game uses.

With only seven kinds of honors, tsuuiisou often comes with another yakuman:

The seven-pairs tsuuiisou is a single yakuman here. Some rules call it "daichisei" and count it double; this game has no such yaku.

How it relates to other yaku

• Honitsu, Honroutou: honors plus one suit is honitsu; honors plus terminals is honroutou. Tsuuiisou is the extreme with no suited tiles left.
• Chiitoitsu: the seven honors make exactly seven pairs, so tsuuiisou can also be built as seven pairs.
• Daisangen, Shousuushii, Daisuushii: a tsuuiisou hand almost always contains most of one of these.

Tsuuiisou odds

How many honors you start with

There are 28 honor tiles, about a fifth of all 136. In a 13-tile starting hand, 6 or more honors come about 2.7% of the time, 7 or more 0.55%, and 9 or more only 0.0070%.

Source: 1,000,000 random 13-tile deals.

How often it happens in play

Four normal-level computers played 40,000 hands on this site's table with 33,226 wins. All yakuman together came up 15 times (13 of them kokushi musou); tsuuiisou didn't appear once. The computers discard honors with no value early, so tsuuiisou is very rare in their games.

When to think about Tsuuiisou

• Lots of honors at the start, with several pairs: honors can only be called by pon, so the more pairs, the more realistic it is.
• Honors not yet discarded: once two of an honor are gone, it can only be your pair.
• Secure a yaku first: ideally your first pon is a yakuhai, so if tsuuiisou falls short you can fall back to yakuhai, honitsu or toitoi.

To try it, open a table of online riichi mahjong — the computers play with you and score the yakuman for you.

Tsuuiisou in other mahjong styles

• Taiwanese mahjong: all honors, 16 tai (Taiwanese mahjong tai list)
• Hong Kong mahjong: all honors is a limit hand, scored at the cap (Hong Kong mahjong fan table)
• Chinese Official (Guobiao): all honors, 64 fan (Guobiao fan list)
• Sichuan mahjong has no honor tiles, so there's no all-honors hand
• American mahjong has a whole category of hands built mostly from winds and dragons (American mahjong Winds & Dragons)

FAQ

How many han is Tsuuiisou?

Tsuuiisou is a yakuman, so it isn't counted in han, and it stays a yakuman when called.

Can Tsuuiisou be seven pairs?

Yes. A pair of each of the seven honors is tsuuiisou in this game (a single yakuman).

What's the difference between Tsuuiisou and Honitsu?

Tsuuiisou has no suited tiles at all and is a yakuman; honitsu is one suit plus honors, 3 han closed and 2 open.

Related yaku

Daisangen Yakuman Triplets of all three dragons — a yakuman even when called. Examples, pao rules and starting-hand odds. Daisuushii Yakuman Triplets of all four winds — a yakuman even when called; double yakuman by default. Example, pao and odds. Chiitoitsu 2 han（closed only） Seven different pairs, closed only, 2 han 25 fu. Examples, picking your wait, combos, and how many pairs make it worth it.