Chuuren poutou: Difference between revisions

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

VisualWikitext

Revision as of 03:50, 20 March 2024

Chuuren poutou 「九連宝燈」 is a 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. In addition, the hand must be closed. Calling a kan on the 1 or 9 invalidates the yakuman.

A special pattern of chuuren tenpai, junsei chuuren poutou 「純正九蓮宝燈」 ("pure churren poutou"), results in a 9-sided wait. It occurs when you complete the 1-1-1-2-3-4-5-6-7-8-9-9-9 pattern without any duplicate tiles. Unlike the 13-sided kokushi musou, this 9-sided wait is formed naturally with four sets and a pair. Some rule variations consider this a double yakuman.

Tile pattern

Regular

Waiting for:

Yasume:

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

Nine tile wait

Waiting for:

In the above animation, the different winning tiles show the shifting tile group configurations as they count up 1 through 9. The groupings change with each winning tile. Sequential groups are marked in green, while the indicated pairs are marked blue. Then in red, the 1 or 9 indicated as triplets.

Value

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.

Development

Main article: List of chuuren configurations

Since this hand is made up of one suit, it overlaps with chinitsu during development. In fact, many tenpai formations may result in chinitsu instead of the yakuman.

The key to this yakuman is the possession of ankou of both 1's and 9's of one suit. If two copies of either 1 or 9 are unavailable, then the yakuman becomes impossible. Similarly, if all four of any other numbered tile is unavailable, then it also becomes impossible. Of course, gathering a string of 2-8 is also difficult.

External links

九連宝燈

Chuuren poutou in Japanese Wikipedia

Mathematical study
Chuuren (YouTube)

Kojima Takeo

@@ Line 13: / Line 13: @@
 * [http://tenhou.net/0/?log=2013102709gm-0009-7447-dce693b1&tw=0&ts=11 Missed chuuren]
 }}
-'''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]].
+'''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. In addition, the hand must be closed. Calling a [[kan]] on the 1 or 9 invalidates the yakuman.
+A special pattern of chuuren [[tenpai]], '''junsei chuuren poutou''' {{kana|純正九蓮宝燈}} ("pure churren poutou"), results in a 9-sided wait. It occurs when you complete the 1-1-1-2-3-4-5-6-7-8-9-9-9 pattern without any duplicate tiles. Unlike the 13-sided [[kokushi musou]], this 9-sided wait is formed naturally with four sets and a pair. Some [[yaku variations|rule variations]] consider this a [[double yakuman]].
 ==Tile pattern==
@@ Line 25: / Line 27: @@
 }}
-If this hand wins with either of the yasume tiles, the hand will score only [[Chinitsu|chinitsu]] rather than the yakuman.
+If this hand wins with either of the yasume tiles, the hand will score only [[chinitsu]] rather than the yakuman.
 ===Nine tile wait===
@@ Line 38: / Line 40: @@
 ==Value==
+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.
-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.
 ==Development==
 {{main|List of chuuren configurations}}
-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.
+Since this hand is made up of one suit, it overlaps with [[chinitsu]] during development. In fact, many tenpai formations may result in chinitsu instead of the yakuman.
+The key to this yakuman is the possession of ankou of both 1's and 9's of one suit. If two copies of either 1 or 9 are unavailable, then the yakuman becomes impossible. Similarly, if all four of any other numbered tile is unavailable, then it also becomes impossible. Of course, gathering a string of 2-8 is also difficult.
 ==External links==