|English||Three colored triplets|
Tile pattern cases
Case where sanshoku doukou is guaranteed
Here, all three koutsu of number three are already on the hand, and sanshoku doukou is guaranteed for both tiles waited on.
Case where sanshoku doukou is not guaranteed
This yaku is actually a fairly difficult yaku to complete. For every number across the three different suits, there are only 12 tiles. A sanshoku douko hand has to have 9 of the 12 tiles of one number. The 3 tiles of that number not in the hand has to be one of each suit, which yields pretty bad odds.
Sanshoku doukou is incompatible with any yaku requiring more than one sequence, namely pinfu, iipeikou, ittsuu, sanshoku doujun, and ryanpeikou. It cannot be combined with honitsu and chinitsu, which require tiles of a single suit. chiitoitsu requires seven pars, which precludes the triplets for sanshoku doukou. Finally, shousangen's two dragon triplets do not leave enough room for the three triplets of suited tiles required.
Whether open or closed, this yaku remains at 2 han.
- Sanshoku doukou in Japanese Wikipedia