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 pairChiitoitsu Form (Local)
Hand: EE SS WW NN WW GG RR
Complete: 7 honor pairsRelated Terms
- 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.
