Ryanpeikou: Difference between revisions

Ryanpeikou (view source)

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 |yakuSpeed   = Very slow
 |difficulty  = Very hard
-|yakuCombine = * [[Riichi]]
+|gameExample = * [http://tenhou.net/0/?log=2014042214gm-0009-7447-4c65a887&tw=2 Not ryanpeikou]
-* [[Ippatsu]]
+* [http://tenhou.net/0/?log=2014012213gm-0009-0000-883e14e9&tw=3&ts=4 Ryanpeikou]
-* [[Tsumo]]
+* [http://tenhou.net/0/?log=2015050816gm-0089-0000-cc9341d1&tw=3&ts=1 Ryanpeikou] with [[tanki]]
-* [[Pinfu]]
+* [http://tenhou.net/0/?log=2014021501gm-00c1-0000-xa219696aa69a&tw=0&ts=1 With] [[chinitsu]]
-* [[Tanyao]]
-* [[Honitsu]]
-* [[Chinitsu]]
-|gameExample =
 }}
-'''Ryanpeikou''' (二盃口) is a standard [[list of yaku|yaku]], consisting of two "[[iipeikou]]".  The prefix "ryan" is a Japanese counter for mahjong, signifying for "two".
+'''Ryanpeikou''' {{kana|二盃口}} is a standard [[list of yaku|yaku]], consisting of two "[[iipeikou]]".  The prefix "ryan" is a Japanese counter for mahjong, signifying for "two".
 ==Tile pattern==
-{{#mjt:223344p66778m11z}} Agari: {{#mjt:8m}}
+{{#mjt:223344p66778m11s}} Agari: {{#mjt:8m}}
-''Note:'' This hand may also win with {{#mjt:5m}}.  However, it'll only count for [[pinfu]] and [[iipeikou]].
+''Note:'' This hand may also win with {{#mjt:5m}}.  However, it'll only count for a [[yasume|lesser value]] of [[iipeikou]] (and [[pinfu]]).
-== Compatability ==
+==Formation==
+At the very least, the hand must initially qualify for the yaku, [[iipeikou]].  With [[tenpai]], the tile wait involves a [[tanki]], to complete the pair, or the need to complete the other "iipeikou".
-=== Chii toitsu===
+Like iipeikou, ryanpeikou requires the ''hand'' to be closed. Note that you are allowed to declare [[ron]], even if the ron'd tile completed the ryanpeikou, so long as the hand itself is closed.
-This yaku does not combine with [[chii toitsu]].  By definition, chii toitsu is formed by the collection of seven pairs.  Although, ryanpeikou may be interpreted as a collection of seven pairs also.  However, ryanpeikou is actually composed of [[mentsu#shuntsu|sequences]], rather than as independent pairs.  The pattern simply appears as a collection of pairs.
-==Formation==
+== Compatibility ==
-At the very least, the hand must initially qualify for the yaku, [[iipeikou]].  With [[tenpai]], the tile wait involves a [[tanki]], to complete the pair, or the need to complete the other "iipeikou".
+{{main|Yaku compatibility}}
+{{Yaku compatibility table|RPK}}
+Ryanpeikou is incompatible with other yaku that place conflicting requirements on the [[mentsu]] in the hand. [[Ittsu]], [[sanshoku]], [[sanshoku doukou]], [[toitoi]], [[sanankou]], [[sankantsu]], and [[shousangen]] are excluded as they are require either three different sequences or at least one triplet/quadruplet. [[Rinshan kaihou]] also requires a kan, so it is excluded. [[Chankan]] is incompatible because the winning tile must be unique in the winning hand---all four copies of it having been used in another player's kan. Finally, [[iipeikou]] is incompatible because it is superseded by ryanpeikou.
+=== Chiitoitsu ===
+This yaku cannot combine with [[chiitoitsu]].  By definition, chiitoitsu is formed by the collection of seven distinct pairs. In most instances of ryanpeikou, the hands look like chiitoitsu hands. However, ryanpeikou is actually composed of [[mentsu#shuntsu|sequences]], rather than as independent pairs. Because of this interpretation, the two yaku remain distinct and incompatible. It is doubtful that any [[rule variations|house rule]] allows the combination of the two yaku.
+Note that not all instances of ryanpeikou could have qualified for chiitoitsu. The following, for instance, is a valid ryanpeikou hand:
+:{{#mjt:22334444m78899p}} Agari: {{#mjt:7p}}
-===With chinitsu===
+=== With chinitsu ===
-Some forms of ryanpeikou mixed with [[chinitsu]] and [[tanyao]] may actually form some optional yakuman, named daisharin (pinzu), daichikurin (souzu), and daisuurin (manzu).
+Some forms of ryanpeikou mixed with [[chinitsu]] and [[tanyao]] may actually form some [[optional yaku|optional yakuman]], named daisharin (pinzu), daichikurin (souzu), and daisuurin (manzu).
 :{{#mjt:2233445566778s}} Agari: {{#mjt:2s}}, {{#mjt:5s}}, or {{#mjt:8s}}
 ==Value==
+[[Image:Coppro ryanpeikou.jpg|250px|thumb|right|Ryanpeikou with real tiles.]]
+{{main|Scoring}}
+Ryanpeikou can only be scored closed, and is always worth 3 han. So there is no need to be concerned about [[kuisagari|the hand losing value when open]]. The cheapest ryanpeikou hand uses either a [[kanchan]] / [[penchan]] / [[tanki]] [[machi|wait]], or a [[ryanmen]] wait with valued [[honor]] as the pair. In both cases, the hand produces a 3-han and 40-fu value by ron.  By tsumo, it is 4-han and 30-fu.
 ==External links==