Toitoi
Last updated: 2026-08-18Toitoi requires four melds that are all triplets or quads, plus one pair — fixed 2 han. Open or closed. See Riichi Mahjong Yaku Guide and Sanankou.
Requirements
- Four melds are triplets or quads (no sequences)
- One pair head
- 2 han; open or closed
On ron, the triplet completed by the winning tile is not concealed if it was open. Closed double-pon tenpai ron on the fourth triplet often yields toitoi + sanankou, not suuankou.
Valid example
Closed: ron on 8 pin completes the fourth triplet. Toitoi + sanankou (ron triplet is not concealed). Not suuankou tanki.
Invalid or confusing
East round, south seat ron on west triplet: toitoi + sanankou, but west is a guest wind — no Yakuhai. Useful for triplet and wind judgment.
Stacking and open hands
Often stacks with yakuhai, sanankou, honroutou, etc. Open play keeps 2 han toitoi but may reduce concealed triplets.
Scoring
Many triplets raise fu (open vs closed triplets). Toitoi hands often have much higher fu than sequence hands. See Fu Calculation Basics.