Tsuuiisou (All Honors) - The Pure Honor Tile Yakuman

What is Tsuuiisou?

Tsuuiisou (All Honors) is a yakuman where your entire hand consists of honor tiles only (winds and dragons). Using no number tiles, this striking yakuman creates a “world of honors only.”

Can be completed with calls (pon), and naturally becomes toitoi form. Occurrence rate is approximately 0.0095%.

Requirements

Condition	Detail	Notes
All honors	Winds + dragons only	No number tiles
4 melds + pair	Standard form	Chiitoitsu (local)
Calls allowed	Pon OK	Menzen not required

Available Tiles

Type	Tiles	Count
Winds	E, S, W, N	4 types
Dragons	W, G, R	3 types
Total	7 types, 28 tiles	All honors

Common Usage

Example 1: Building

"All honors, going for tsuuiisou"
"Cutting all numbers for tsuuiisou"

Example 2: Completion

"Tsuuiisou complete!"
"All-black tsuuiisou"

Example 3: Alertness

"Only cutting numbers, tsuuiisou?"
"Pair-heavy, watch for tsuuiisou"

Example Hands

Basic Form (Toitoi)

Hand: EEE SSS WWW GGG RR
Complete: 4 honor triplets + honor pair

Chiitoitsu Form (Local)

Hand: EE SS WW NN WW GG RR
Complete: 7 honor pairs

Jihai: Honor tiles
Toitoi: Inevitable combination
Honroutou: Similar but different
Daisangen: Can combine
Shousuushii: Can combine

Common Mistakes

Number tile presence
- Even 1 number tile = invalid
- Must be pure honors
Honroutou confusion
- Tsuuiisou: honors only
- Honroutou: honors + terminals
Tile count difficulty
- Need minimum 14 tiles
- Building from 7 types is hard
Chiitoitsu form
- Local rule
- Confirm beforehand

Strategy

From the Deal

Honor Count	Decision	Reason
10+ tiles	Go for it	High chance
8-9 tiles	See pairs	Possible growth
7 or less	Usually skip	Try other hands

Early Game Approach

Cut numbers
- From the edges
- Don’t hesitate
Keep all honors
- Save everything
- Even isolates
Call early
- Pon to accelerate
- Build shape

Tsuuiisou Combinations

Main Combinations

Combination	Condition	Value
Daisangen	All 3 dragon triplets	Double yakuman
Shousuushii	3 wind triplets + pair	Double yakuman
Daisuushii	All 4 wind triplets	Triple yakuman
Suuankou	All concealed	Double yakuman

Ultimate Form

Ex: EEE SSS WWW NNN WW
→ Tsuuiisou + Daisuushii (Triple yakuman)

Probability and Value

Occurrence Rate

Tsuuiisou: ~0.0095%
Medium difficulty among yakuman
Harder than chinitsu

Constraints

Limited tile types
- Only 7 types of honors
- Number tiles: 27 types
Tile count limit
- 4 of each maximum
- Total 28 tiles
Shape constraint
- Basically toitoi
- No sequences

Aesthetics

Visual Impact

Unity
- All honors
- Row of black tiles
Intimidation
- Honor tile power
- Pressure on opponents
Completion beauty
- Ultimate unity
- Artistic value

Symbolic Value

Transcends numbers
Pure form
Pinnacle of mahjong

Defense Against Tsuuiisou

Reading Signs

Discards
- Numbers only
- From edges first
Calls
- Honor pons
- Multiple times
Pair-heavy field
- Many pairs out
- Few honors visible

Countermeasures

Hold honors
- Don’t release
- Especially pairs
Quick win
- Before completion
- Speed battle
Ignore efficiency
- Prioritize honors
- Safety first

Local Rules

Chiitoitsu Form

Rule	7-pair form	Reason
Common	Not allowed	Toitoi is base
Some areas	Allowed	Special form
Tournament	Varies	Check rules

Summary

Tsuuiisou is a visually striking yakuman made entirely of wind and dragon tiles. With the constraint of using only 7 honor types, it’s challenging but achievable with calls when dealt 10+ honor tiles. Beginners should learn “honors only” and attempt it with heavy honor deals. The completed row of black tiles embodies mahjong’s beauty.