Ryanpeikou
| Type | Yaku |
|---|---|
| Kanji | 二盃口 |
| English | Two sets of identical sequences |
| Value | 3 han (closed only) |
| Speed | Very slow |
| Difficulty | Very hard |
Ryanpeikou 「二盃口」 is a yaku scored when a hand has two "iipeikou". In Japanese, the prefix "ryan" is a mahjong-specific counter for "two".
Tile pattern
Agari:
Note: This hand may also win with 
. However, it will only count for a lesser value of iipeikou (and pinfu).
Formation
At the very least, the hand must initially qualify for iipeikou. A ryanpeikou tenpai will either wait to complete a pair (tanki wait), or wait to complete the other "iipeikou".
Like iipeikou, ryanpeikou requires the hand to be closed. Note that you are allowed to declare ron, even if the ronned tile completed the ryanpeikou, so long as the hand itself is closed.
Compatibility
^ Ippatsu requires riichi to be of any use.
| RCH | DRI | IPP | SMO | TAN | PFU | IPK | ITT | YAK | SDJ | SDO | TOI | SNA | SNK | CHA | JUN | RPK | SSG | HRO | HON | CHN | CHI | RIN | HAI | HOU | CHK | |
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Ryanpeikou is incompatible with other yaku that place conflicting requirements on the mentsu in the hand. Ittsu, sanshoku, sanshoku doukou, toitoi, sanankou, sankantsu, and shousangen are excluded as they are require either three different sequences or at least one triplet/quadruplet. Rinshan kaihou also requires a kan, so it is excluded. Chankan is incompatible because the winning tile must be unique in the winning hand---all four copies of it having been used in another player's kan. Finally, iipeikou is incompatible because it is superseded by ryanpeikou.
Chiitoitsu
This yaku cannot combine with chiitoitsu. By definition, chiitoitsu is formed by the collection of seven distinct pairs. Ryanpeikou may appear as seven pairs, but is actually interpreted as four sequences. As the hand cannot be interpreted as both pairs and sequences, chiitoitsu is not compatible. It is doubtful that any house rule allows the combination of the two yaku.
Note that not all instances of ryanpeikou would have qualified for chiitoitsu. The following, for instance, is a valid ryanpeikou hand:
Agari:
With chinitsu
Some forms of ryanpeikou mixed with chinitsu and tanyao may actually form some optional yakuman, named daisharin (pinzu), daichikurin (souzu), and daisuurin (manzu).
Agari: , , or
Value
Ryanpeikou can only be scored closed, and is always worth 3 han. So there is no need to be concerned about the hand losing value when open. The cheapest ryanpeikou hand uses either a kanchan / penchan / tanki wait, or a ryanmen wait with valued honor as the pair. In both cases, the hand produces a 3-han and 40-fu value by ron. By tsumo, it is 4-han and 30-fu.
External links
- Ryanpeikou in Japanese Wikipedia
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