Riichi Mahjong Yaku
Pure Double Sequence
Also known as: Iipeikou · Iipeiko · 一盃口
Two identical sequences in the same suit, completed in a closed hand.
Yaku value
Closed hand
1 Han
Open hand
Closed only
Requirements
The hand must contain two sequences with the same numbers and suit, such as two 3-4-5 Pin sequences, and remain closed.
Common scoring mistake
Matching sequences in different suits do not count. Calling any tile opens the hand and removes this Yaku.
Values follow common modern Riichi rules. Local and tournament rules may differ, especially for double Yakuman.