Iipeikou
| Type | Yaku |
|---|---|
| Kanji | 一盃口 |
| English |
Identical sequences Double sequences |
| Value | 1 han (closed only) |
| Speed | Medium |
| Difficulty | Easy |
Iipeikou 「一盃口」 is a standard yaku involving two identical sequences. Identical means that both shuntsu must be of the same numbers and suit. This yaku also requires the hand to be closed. Any open call ruins the yaku, even if the pattern already existed within the hand. If this pattern is found twice in one hand, an alternative yaku, ryanpeikou, is scored.
Tile pattern
Rearrangement
Arrangement of tiles is irrelevant, as long as two groups of tiles form the identical sequences.
Formation
This yaku usually appears as three groups of consecutive pairs. However, the rule interpretation views them as a two sequences. Potential acquisition of this yaku is best recognizable when five out of the six tiles are present in the hand.
Note that iipeikou requires the hand to be closed. If you make any open call (chii/pon/open kan), iipeikou can never be scored, even if the call was unrelated to the identical sequences. However, the sequences do not have to be closed: if you declare ron with a closed hand, iipeikou can still be scored, even if the winning tile completed the 2nd identical sequence.
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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Iipeikou requires two sequences, and as a result is incompatible with sanshoku doukou, toitoi, honroutou, chiitoitsu, sanankou, and sankantsu, all of which require either at least three koutsu/kantsu or a seven pair structure. The final incompatibility is with ryanpeikou, as ryanpeikou implies iipeikou and so iipeikou is not counted.
Iipeikou is often combined with pinfu, which also requires sequences. Iipeikou can naturally be obtained with shapes like 4456 and 4556, which a pinfu hand may have due to tile efficiency reasons.
External links
- Iipeikou in Japanese Wikipedia
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