is a , and the hand has to be closed. You hold four triplets built from your own draws, plus a pair. Win it by tsumo, or by on the pair.
The name players use is suuankou (四暗刻). This site's glossary also lists it as Four Concealed Triplets. The EMA 2016 rules call it four concealed pungs.
What counts as concealed
A triplet is concealed when every tile in it came from your own draws. A closed still counts: the EMA entry reads four concealed pungs or kongs. A is open, so one call ends the yakuman.
The last tile decides the rest. Tenhou's rules count a triplet completed by ron as an open triplet. A ron that finishes the fourth triplet leaves three concealed ones. That's sanankou, not suuankou. The EMA 2016 rules make the same call in their fifth scoring example: four triplets, the last one won on a discard, scored as three concealed pungs.
The glossary entry is the short form: four triplets formed without calls, won by tsumo unless the wait is on the pair.
Tsumo or ron on two pairs
are done: 2 man, 4 pin, and 6 sou. The hand waits on or , a wait on two pairs.
Draw either tile yourself and the fourth triplet is concealed too. That's suuankou. A collects 8,000 from each other non-dealer and 16,000 from the dealer, 32,000 in all. The dealer collects 16,000 from each player.
Win either tile by ron and the finished triplet counts as open. The hand is toitoi and sanankou: 4 . The fu are the base 20, plus 10 for a closed ron, plus 4 for each closed simple triplet. The triplet the ron finishes adds 2 on the 8 sou or 4 on the 9 pin. 44 or 46 rounds up to 50, and 4 han 50 fu is paid as a . A non-dealer collects 8,000. The dealer collects 12,000.
The tsumo pays four times the ron. Those payments have no , no , and no sticks. The scoring guide lists every triplet's fu.
Ron on the pair
Four concealed triplets are done: 2 man, 4 pin, 6 sou, and 8 sou. The hand waits on alone, a for the pair.
Here a ron keeps the yakuman. The discard completes the pair, not a triplet, so all four triplets stay concealed. This is suuankou tanki (四暗刻単騎), the one suuankou you can win off a discard. What it pays depends on where you play.
- Tenhou: one yakuman. Its rules name suuankou tanki and pay it as a single. A non-dealer ron collects 32,000, and the dealer collects 48,000.
- Mahjong Soul: a double yakuman. A non-dealer ron collects 64,000, and the dealer collects 96,000.
- EMA 2016: one yakuman. The entry allows a win on a discard only on the single wait, and yakuman don't stack there.
Open or closed
Closed only. Every triplet has to be concealed, so a pon ends it. The EMA 2016 entry starts with "Concealed hand", and Mahjong Soul's in-game yaku list marks it "Menzenchin Only". A closed kan keeps the hand closed. That's the row on this site: yakuman, closed only.
What sits with it
A yakuman ignores ordinary yaku and dora. On Tenhou and Mahjong Soul, a second yakuman stacks on . Daisangen fits when three of the triplets are dragons. Tsuuiisou fits when every tile is an honor. Chinroutou fits when every tile is a 1 or a 9. Ryuuiisou fits when every tile is green. The yakuman page covers how the limit stacks.
Common mistakes
- Calling suuankou on a ron with two pairs. The triplet the discard finishes is open, so the hand is and sanankou.
- Calling pon on the way. One called triplet opens the hand.
- Giving up after a closed kan. A concealed quad keeps the yakuman.
- Paying the single wait as a double on Tenhou. Mahjong Soul doubles it. Tenhou and the EMA 2016 rules pay one yakuman.
Price a suuankou
The score calculator pays one yakuman at 32,000 or 48,000 on a ron, and two at 64,000 or 96,000. The ron on two pairs is 4 han 50 fu: 8,000.
Open the score calculator