From Japanese mahjong wiki
(Redirected from Kantankan)
|Fu||2 fu or Triplet dependent|
|Tile types waiting||2 sided wait|
|Tiles available||7 tiles|
|Tenhou.net example||Baiman tsumo|
At minimum, the pattern produces 2 fu either by the kanchan or the tanki wait. If it wins with the tanki wait, then additional fu is generated from the triplet.