Chuuren poutou

Chuuren poutou
Type	Yakuman
Kanji	九連宝燈; 純正九蓮宝燈
English	Nine gates; Pure nine gates
Value	Yakuman (closed only)
Speed	Very slow
Difficulty	Very hard

Chuuren poutou (九連宝燈) is a yakuman. 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 chuuren poutou tenpai with the specific pattern already in place has a 9-sided wait, the winning hand is then called junsei chuuren poutou (純正九蓮宝燈).

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 chii toitsu and kokushi musou.

Tile pattern

Regular

Agari:

Note: This hand can also win with

. However, that would downgrade the hand to a mere chinitsu.

Nine tile wait

Agari: Any pinzu 1 through 9.

Value

Chuuren is a yakuman hand. Some rules award a double yakuman instead when the hand goes out from the 9-sided wait.

Possible minimum/maximum point values
Han/Fu	Ron		Han/Fu	Tsumo
Han/Fu	Non-dealer	Dealer	Han/Fu	Non-dealer	Dealer
Single tile wait			Single tile wait
Yakuman	32000	48000	Yakuman	8000/16000	16000 all
If Pure Chuuren is double			If Pure Chuuren is double
Yakuman 2x	64000	96000	Yakuman 2x	16000/32000	32000 all

Formation

The key to this yakuman is the possession of ankou of both 1's and 9's of one suit. 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. 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 complicated waits.