is 3 on a and 2 han after a call. Every set and the pair hold a 1 or a 9, at least one set is a run, and the hand has no honors.
Players shorten the Japanese name, 純全帯么九, to junchan. This site's glossary also lists it as Pure Outside Hand. The EMA 2016 rules call it terminals in all sets.
A 1 or a 9 in every set
The runs that count are 123 and 789. A triplet counts when it's 1s or 9s. The pair has to be 1s or 9s too. An honor anywhere turns the hand into chanta, which is worth a han less.
The hand waits on 
or 
. It's closed, all runs, with a plain pair and a , so either tile is also pinfu.
makes 123 sou. That's junchan plus : 4 han 30 fu on a . A collects 7,700. The dealer collects 11,600.
makes 234 sou. The hand is pinfu alone: 1 han 30 fu. A non-dealer ron collects 1,000. The dealer collects 1,500.
Same hand, same wait. The 1 sou pays 6,700 more on a non-dealer ron. Those payments have no , no , and no sticks.
The glossary entry is the short form: every set and the pair includes a terminal and no honors, 3 han closed and 2 han open. The scoring guide shows where 30 fu and the payment table come from.
Closed or open
Tenhou's rules list junchan at 3 han and mark it as losing a han after a call. The EMA 2016 rules file it with the 2 fan yaku, add a fan when the hand is concealed, and ask for at least one run. That's the row on this site: 3 closed, 2 open.
Junchan replaces . You score 3 han, not 3 plus 2. The World Riichi Championship rules say so in their junchan entry.
With sanshoku, before riichi
You hold 123 man, 123 pin, 12 sou, 789 sou, and a pair of 9 man. The hand waits on only, an .
makes 123 sou, the third 123. That's junchan and sanshoku: 3 han plus 2 han. At 5 han the hand is a with no riichi and no dora. A non-dealer ron collects 8,000. The dealer collects 12,000.
An open junchan
You called on 789 pin: . These ten tiles are still in your hand.
The hand waits on or , a wait on two pairs. Either tile makes a terminal triplet and leaves the other pair. Open junchan is 2 han.
The fu are the base 20, plus 4 for the new triplet. A triplet finished on a discard counts as open, and an open triplet of terminals is worth 4. 24 rounds up to 30. At 2 han 30 fu, a non-dealer ron collects 2,000. The dealer collects 2,900.
Common mistakes
- Letting an honor in. A dragon pair turns junchan into chanta, and the hand loses a han.
- Scoring chanta and junchan together. Junchan replaces chanta.
- Counting 3 han after a call. An open junchan is 2 han.
- Forgetting the run. Four triplets of 1s and 9s plus a pair of them is chinroutou, a yakuman, and junchan never comes into it.
What sits with it
Sanshoku fits with 123 or 789 in all three suits, as in the second hand. Pinfu fits with a plain pair and a two-sided wait, as in the first. Iipeikou fits with two matching 123s or 789s. Chinitsu fits when every tile is one suit. Tanyao never fits, because junchan is built on 1s and 9s.
Price a junchan hand
The score calculator turns 4 han 30 fu, junchan with pinfu, into 7,700 or 11,600. An open junchan starts at 2 han.
Open the score calculator