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| |gameExample = * [http://tenhou.net/0/?log=2014011309gm-0009-7447-f766aece&tw=0&ts=4 Iipeikou] with [[damaten]] | | |gameExample = * [http://tenhou.net/0/?log=2014011309gm-0009-7447-f766aece&tw=0&ts=4 Iipeikou] with [[damaten]] |
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| '''Iipeikou''' {{kana|一盃口}} is a standard [[yaku]]. Its feature composes of two identical [[mentsu#shuntsu|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 [[naki|open call]] invalidates the yaku, even if the pattern exists within the hand. | | '''Iipeikou''' {{kana|一盃口}} is a standard [[yaku]] involving two identical [[mentsu#Shuntsu|sequences]]. Identical means that both [[shuntsu]] must be of the same numbers and suit. This yaku also requires the hand to be closed. Any [[naki|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. |
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| ==Tile pattern== | | ==Tile pattern== |
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| ==Formation== | | ==Formation== |
| This yaku is usually presented as three groups of consecutive pairs. However, the rule interpretation views them as a two [[shuntsu|sequences]]. Potential acquisition of this yaku is best recognizable when five out of the six tiles are present in the hand. | | This yaku usually appears as three groups of consecutive pairs. However, the rule interpretation views them as a two [[shuntsu|sequences]]. Potential acquisition of this yaku is best recognizable when five out of the six tiles are present in the hand. |
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| === Compatability ===
| | 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. |
| {{main|Yaku compatability}}
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| {{yakuheader}}
| | === Compatibility === |
| | IPK || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} ||bgcolor="000000"| || {{yes}} || {{yes}} || {{yes}} || {{no}} || {{no}} || {{no}} || {{no}} || {{yes}} || {{yes}} || {{no}} || {{yes}} || {{no}} || {{yes}} || {{yes}} || {{no}} || {{yes}} || {{yes}} || {{yes}} || {{yes}}
| | {{main|Yaku compatibility}} |
| |}
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| | {{Yaku compatibility table|IPK}} |
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| === Common combinations ===
| | 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. |
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| ==Value==
| | 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. |
| {{yaku value|width = 40% |align = right
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| <!--Minimum for ron-->
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| | comment1 = Minimum possible
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| | ronhanfumin = 1 - 40
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| | ronnondealermin = 1300
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| | rondealermin = 2000
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| <!--Minimum for tsumo-->
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| | comment2 = With mentsumo
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| | tsumohanfumin = 2 - 30
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| | tsumonondealermin = 1000/500
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| | tsumodealermin = 500
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| <!--Maximum for ron-->
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| | comment3 = Maximum without other yaku
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| | ronhanfumax = 1 - 100
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| | ronnondealermax = 3200
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| | rondealermax = 4800
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| <!--Maximum for ron-->
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| | comment4 = With mentsumo
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| | tsumohanfumax = 2 - 100
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| | tsumonondealermax = 3200/1600
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| | tsumodealermax = 3200
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| }}
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| {{main|Scoring}}
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| 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.
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| * '''Minimum''' ''(Iipeikou only)''
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| : {{#mjt: 556677p13m44466s}} Agari: {{#mjt: 2m}}
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| * '''Maximum''' ''(Iipeikou only, when not seated north)''
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| : {{#mjt: 556677s1z}} {{#mjt:0z11s00440z}} Agari: {{#mjt: 1z}}
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| 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 [[machi|wait patterns]] or [[koutsu|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 [[mentsumo|closed tsumo]].
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| 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 [[jihai|honor tiles]] or [[terminal|terminals]] used for [[kan|closed kans]]. With that, the wait pattern involves a [[tanki|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.
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| ==External links== | | ==External links== |