Chuuren poutou: Difference between revisions

'''Chuuren poutou''' {{kana|九連宝燈}} is a [[List of yaku#Yakuman|yakuman]] and a specific instance of [[chinitsu]]. It contains the 13-tile pattern 1-1-1-2-3-4-5-6-7-8-9-9-9 of the same suit, plus any one more tile from the suit. A special pattern of chuuren poutou [[Tenpai|tenpai]] produces one with a unique 9-sided wait.  In this case, the winning hand is then called '''junsei chuuren poutou''' {{kana|純正九蓮宝燈}}, or pure chuuren poutou. The 13-tile pattern generates a 9-sided wait even as a normal hand with four sets and a pair. Chuuren poutou is therefore no hand shape exception, unlike [[Chiitoitsu|chiitoitsu]] and [[Kokushi musou|kokushi musou]].

If this hand wins with either of the yasume tiles, the hand will score only [[Chinitsu|chinitsu]] rather than the yakuman.

 

Chuuren is a yakuman hand. However, while tenpai, some tile waits may actually award the hand for a considerably less value of haneman, as a closed chinitsu.  Some rules award a [[double yakuman]] instead when the hand goes out from the 9-sided wait.

The key to this yakuman is the possession of ankou of both 1's and 9's of one suit.  Since this hand uses a single suit, it overlaps [[chinitsu]] during development.   In fact, many tenpai formations may result in chinitsu, rather than the yakuman. This is due to the ability of chinitsu to form some [[Machi|complicated waits]]. If two of either group of tiles are not available, then any attempt at this yakuman is no longer possible. Of course, that is in addition to the collection of a string consisting of 2-8 tiles of the same suit.  Likewise, if all four copies of any one of these numbered tiles are rendered unavailable, then the yakuman is no longer possible.