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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 patter may also be produced twice in one hand, to form an alternative yaku, [[ryanpeikou]]. | | '''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. A single [[naki|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. |
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| ==Tile pattern== | | ==Tile pattern== |
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| 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 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. |
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| === Compatability === | | === Compatibility === |
| {{main|Yaku compatability}} | | {{main|Yaku compatibility}} |
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| {{yakuheader}} | | {{Yaku compatibility table|IPK}} |
| | 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}} | |
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| ==Value==
| | 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. |
| {| class="wikitable" width=40% align=right
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| !rowspan=2 width=10%| Han/Fu !!colspan=2 width=40%|Ron !!rowspan=2 width=10%| Han/Fu !!colspan=2 width=40%| Tsumo
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| !width=20%| Non-dealer !!width=20%| Dealer !!width=20%| Non-dealer !!width=20%| Dealer
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| |colspan=3| ''Minimum possible'' ||colspan=3| ''With mentsumo''
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| |align=center| '''1 - 40''' ||align=center| 1300 ||align=center| 2000 ||align=center| '''2 - 30''' ||align=center| 1000/500 ||align=center| 500
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| |colspan=3| ''Maximum without other yaku'' ||colspan=3| ''With mentsumo''
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| |align=center| '''1 - 80''' ||align=center| 2300 ||align=center| 3400 ||align=center| '''2 - 70''' ||align=center| 1300/2600 ||align=center| 2600
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| |}
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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.
| | 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. |
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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: 556677s2m}} {{#mjt:0z11s00440z}} Agari: {{#mjt: 2m}}
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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 80 fu. The 80 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 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.
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| ==External links== | | ==External links== |