Chiitoitsu
2 han (concealed only)#Seven different pairs: one of the few winning shapes that is not four sets plus a pair.
Example
1 Characters1 Characters2 Characters2 Characters3 Dots3 Dots4 Dots4 Dots5 Bamboo5 Bamboo6 Bamboo6 BambooWhite Dragon
WinWhite Dragon
Counted by the scoring program:
- Chiitoitsu2 han · Japanese mahjong yaku
- Total2 han, 25 fu · Japanese mahjong yaku
Counterexample
1 Characters1 Characters2 Characters2 Characters3 Dots3 Dots4 Dots4 Dots5 Bamboo5 Bamboo6 BambooWhite DragonWhite Dragon
WinWhite Dragon
Only six pairs: not a winning hand.