Iipeikou: Difference between revisions

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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]] 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.
'''Iipeikou''' {{kana|一盃口}} is a [[yaku]] scored when a hand has two identical [[sequence]]s (two sequences with the same number and suit). It also requires the hand to be [[closed]]. If a hand has "two iipeikou"s, it instead scores [[ryanpeikou]].


==Tile pattern==
==Tile pattern==
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==Formation==
==Formation==
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.
When the tiles are sorted, iipeikou may appear as three groups of consecutive pairs. However, since they must be interpreted as two sequences to score as iipeikou, a hand can never score both iipeikou and [[chiitoitsu]].


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 was the one to complete the iipeikou pattern.
Note that iipeikou requires the hand to be closed, so any [[naki|open call]] (chii/pon/open kan) will invalidate this yaku, even if the call was unrelated to this yaku. However, you ''are'' allowed to call [[ron]] and score this yaku, even if the winning tile was the one to complete the iipeikou pattern.


== Compatibility ==
== Compatibility ==
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