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. Its feature composes of two identical sequences. By identical, both shuntsu must be of the same number and same suit. This pattern may also be produced twice in one hand, to form an alternative yaku, ryanpeikou. Finally, the hand must be closed only. A single open call invalidates the yaku, even if the pattern exists within the hand.
Tile pattern
Rearrangement
Arrangement of tiles is irrelevant, as long as two groups of tiles form the identical sequences.
Formation
This yaku is usually presented 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.
Compatability
^ 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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Common combinations
Value
| Han/Fu | Ron | Han/Fu | Tsumo | ||
|---|---|---|---|---|---|
| Non-dealer | Dealer | Non-dealer | Dealer | ||
| Minimum possible | With mentsumo | ||||
| 1 - 40 | 1300 | 2000 | 2 - 30 | 1000/500 | 500 |
| Maximum without other yaku | With mentsumo | ||||
| 1 - 100 | 3200 | 4800 | 2 - 100 | 3200/1600 | 3200 |
This yaku is required to be closed only. Even if the pattern exists within an open hand, the yaku will not be counted in this case.
- Minimum (Iipeikou only)
Agari: 
- Maximum (Iipeikou only, when not seated north)
Agari:
The lowest possible score for a iipeikou nomi (only) hand is 1 han and 40 fu. The 40 fu is derived from a closed ron (10 fu) plus possession of another fu generated form, either by certain wait patterns or triplet(s). In order for the hand to involve 30 fu, it would have to involve pinfu with the closed ron. Likewise, a win by tsumo may involve a similar form. Given the closed only aspect of this hand, it is unavoidable to score an "iipeikou only" hand without a combination with closed tsumo.
The highest possible score for an iipeikou nomi (only) hand is 1 and 100 fu. The 64 fu is derived from two groups of non-yakuhai honor tiles or terminals used for closed kans. With that, the wait pattern involves a single wait on the East round dealer win pair; the pairing brings in 6 fu (4 for the double wind and 2 for the single wait). Add the base fu and closed ron, and the total fu count is exactly 100. For tsumo, the difference again involves a closed tsumo and the lack of 10 fu derived from a closed ron. However, it surpasses 90 fu from the tsumo bonus and rounds up to 100 anyways. Naturally, when combined with other yaku, the score can be significantly higher.
External links
- Iipeikou in Japanese Wikipedia
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