Riichi Mahjong Yaku
Three Concealed Triplets
Also known as: Sanankou · Sananko · 三暗刻
A hand containing three triplets or quads completed without calling another player’s tile.
Yaku value
Closed hand
2 Han
Open hand
2 Han
Requirements
Three groups must be concealed triplets or concealed quads. Other parts of the hand may be open.
Common scoring mistake
Completing a triplet by Ron usually makes that triplet open for this Yaku. The other three groups must still be concealed.
Values follow common modern Riichi rules. Local and tournament rules may differ, especially for double Yakuman.