Iipeikou

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Iipeikou
Type Yaku
Kanji 一盃口
English Identical sequences
Double sequences
Pure Double Chow
Value 1 han (closed only)
Speed Medium
Difficulty Easy
Example(s)
More examples

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. A single open call invalidates the yaku, even if the pattern exists within the hand. If this pattern is found twice in one hand, an alternative yaku, ryanpeikou, is scored.

Tile pattern

Tile-3m.pngTile-3m.pngTile-4m.pngTile-4m.pngTile-5m.pngTile-5m.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.png

Rearrangement

Tile-3m.pngTile-4m.pngTile-5m.pngTile-3m.pngTile-4m.pngTile-5m.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.pngTile-unknown.png

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 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png 13 red x.png 13 red x.png 13 red x.png 13 red x.png 13 green check.png 13 green check.png 13 red x.png 13 green check.png 13 red x.png 13 green check.png 13 green check.png 13 red x.png 13 green check.png 13 green check.png 13 green check.png 13 green check.png

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.

Common combinations

External links

Iipeikou in Japanese Wikipedia