Iipeikou

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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
IPK

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 - 80 2300 3400 2 - 70 1300/2600 2600

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 80 fu. The 80 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 tile. For tsumo, the difference again involves a closed tsumo and the lack of 10 fu derived from a closed ron. Naturally, when combined with other yaku, the score can be significantly higher.

External links

Iipeikou in Japanese Wikipedia