Iipeikou
1 han (concealed only)#Two identical chows in the same suit, such as two 2-3-4 of characters.
Example
2 Characters2 Characters3 Characters3 Characters4 Characters5 Dots6 Dots7 Dots6 Bamboo7 Bamboo8 Bamboo9 Bamboo9 Bamboo
Win4 Characters
Counted by the scoring program:
- Pinfu1 han · Japanese mahjong yaku
- Iipeikou1 han · Japanese mahjong yaku
- Total2 han, 30 fu · Japanese mahjong yaku
Counterexample
2 Characters3 Characters5 Dots6 Dots7 Dots6 Bamboo7 Bamboo8 Bamboo9 Bamboo9 Bamboo
Win4 Characters
2 Characters3 Characters4 Characters
One of them was called with chow; after calling it is no longer iipeikou (and this hand has no yaku).