Riichi Mahjong · 3 han（closed only）

Ryanpeikou (Twice Pure Double Sequence) in Riichi Mahjong: Rules and Examples

In riichi mahjong, Ryanpeikou is a closed-only yaku worth 3 han: two iipeikou in one hand — two different sequences, each doubled — plus a pair. It doesn't stack with iipeikou; it replaces it: iipeikou is 1 han, ryanpeikou 3 han.

The rules for Ryanpeikou

• Two different sequences, each appearing twice exactly: e.g. twice and twice
• The two sequences may be in the same suit ( and ) or different suits
• Closed only: any chi, pon or open kan removes it
• Any pair

Ryanpeikou vs Chiitoitsu

The 14 tiles of a ryanpeikou can always be split into seven pairs as well: is , and . Only one reading is used, and the scoring tries both and keeps the higher score.

• Chiitoitsu is 2 han 25 fu; ryanpeikou is 3 han with normal fu (at least 30 fu by ron)
• So a ryanpeikou shape is almost always scored as ryanpeikou, not seven pairs
• Exception: a hand using four of the same tile (e.g. ) can't be seven pairs at all, only ryanpeikou

How Ryanpeikou is scored

The yaku, han, fu and points below are computed live by the same scoring code the game uses.

Common combinations:

How it relates to other yaku

• Iipeikou: two iipeikou make ryanpeikou; the two never count together.
• Chiitoitsu: a ryanpeikou shape is always a seven-pairs shape, and the higher score is used.
• Pinfu, tanyao: all four sets are sequences, so a two-sided wait often brings pinfu, and 2–8 only brings tanyao.
• Chinitsu: when both doubled sequences are in one suit, the hand can grow into a full flush.

Ryanpeikou odds

Ryanpeikou is rare: two sequences have to double up exactly, and the hand must stay closed. In 40,000 hands of normal computer play on this site, with 33,226 wins, ryanpeikou appeared only 7 times — 0.021% of wins, roughly once every 5,714 hands.

Source: 40,000 computer hands on this site (all four at normal level), 33,226 wins. A win usually has several yaku, so the shares add up to more than 100%.

When Ryanpeikou is in reach

• You have iipeikou and the other side is a doubled shape like : one gives twice.
• Hands with many pairs: when you're thinking about seven pairs and the pairs are adjacent (, ), ryanpeikou may also be possible.
• Stay closed: ryanpeikou can't be called, so don't call when it's in sight.

To practice, open a table of free online riichi mahjong; the scoring automatically picks the higher of ryanpeikou and chiitoitsu.

FAQ

How many han is Ryanpeikou?

3 han, closed only, and it replaces iipeikou.

Is it scored as Ryanpeikou or Chiitoitsu?

Whichever scores higher. Ryanpeikou is 3 han and chiitoitsu 2 han, so it's almost always ryanpeikou; the two never count together.

Can you call for Ryanpeikou?

No. Like iipeikou, it's closed only and disappears once you call.

Related yaku

Iipeikou 1 han（closed only） Two identical sequences, closed only, 1 han. Examples, why a call kills it, and how it differs from ryanpeikou and chiitoitsu. Chiitoitsu 2 han（closed only） Seven different pairs, closed only, 2 han 25 fu. Examples, picking your wait, combos, and how many pairs make it worth it. Pinfu 1 han（closed only） Four sequences, a non-value pair and a two-sided wait — closed only, 1 han. Waits, 20 vs 30 fu, common combos.