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Honroutou: Difference between revisions

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* [http://tenhou.net/0/?log=2014012816gm-0009-7447-3851d1db&tw=1&ts=5 With] [[sanshoku doukou]]
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'''Honroutou''' {{kana|混老頭}} is a standard yaku, focusing on just the [[jihai|honors]] and [[routouhai|terminals]].  Any other tile type cannot be used for this yaku.
'''Honroutou''' {{kana|混老頭}} is a [[yaku]] scored when every tile in the hand is either a [[terminal]] or an [[honor]] tile. The hand must contain at least one honor and one terminal to score honroutou; an all honor hand would be [[tsuuiisou]], while an all terminal hand would be [[chinroutou]].  


==Tile pattern==
==Tile pattern==
Line 21: Line 21:


==Formation==
==Formation==
This yaku requires [[routouhai|terminal]] and [[jihai|honor]] tiles only.  While terminals may be used for [[shuntsu|sequences]], this yaku cannot form those sequences. Otherwise, this yaku would no longer be honroutou but rather [[chanta]].
Because every tile must be a [[terminal]] or [[honor]], [[sequence]]s are not allowed, since a sequence always contains non-terminal tiles. Naturally, a large amount of honors/terminals are required to even consider this yaku. A majority of honroutou hands are open, using [[pon]] to complete a triplet-based hand.


=== Compatability ===
== Compatibility ==
{{main|Yaku compatability}}
{{main|Yaku compatibility}}


{{yakuheader}}
{{Yaku compatibility table|HRO}}
| HRO || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{no}} || {{no}} || {{no}} || {{no}} || {{yes}} || {{no}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{no}} || {{no}} || {{no}} || {{yes}} ||bgcolor="000000"|  || {{yes}} || {{no}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{no}}
 
|}
Honroutou is not compatible with any yaku which require a sequence, which accounts for most of the incompatibilities (including [[chankan]], which must always win on a sequence wait). [[Tanyao]] is incompatible because it requires no terminals or honours, and honroutou requires only those tiles. [[Chanta]] is incompatible because it is implied by honroutou. Finally, if [[honroutou]] is combined with [[junchan]], the entire hand must be terminals, which gives the [[chinroutou]] yakuman.


==Value==
==Value==
At minimum, it is impossible to score this yaku without at least either [[toitoi]] or [[chiitoitsu]]. So, this yaku is actually at minimum, the equivalent of 4 han. 
It is impossible to score this yaku without at least either [[toitoi]] or [[chiitoitsu]]. Therefore, every hand that scores honroutou is worth at least 4 han.
 
When factoring [[fu]], the combination of [[koutsu|ankou]] and [[koutsu|minkou]] (closed and open triplets) produces a fu count of higher than 10.  The lowest possible fu is generated with 4 minkou, leading to [[tanki|hadaka tanki]] (lone pair wait).  Adding the base 20 fu for any hand, this yaku is guaranteed greater than 30 fu; and with the rules of fu, that number is actually rounded up to at least 40 fu.  Therefore, a honroutou composed of ankou and minkou is at minimum a [[mangan]].
 
Example:
:{{#mjt:9s}} {{#mjt:1'11p999'm4'443'33z}}  Agari: {{#mjt:9s}}
 
This is the second lowest possible honroutou, if not played in the West round.  For each of the open calls, they are worth 4 fu.  In combination, they add up to 16 fu.  Then add the [[tanki]] (pair wait) for 2 fu.  In total, this hand has 18 fu, in addition to the base 20 fu; and that makes 38 fu.  Per the [[scoring|scoring rules]], the number is rounded up to 40 fu.  With a minimum of 4 han and 40 fu, this hand is guaranteed at least mangan when chiitoitsu is not involved.


The lowest scoring honroutou is a [[chiitoitsu]] won by ron without riichi or dora.  
In toitoi form, honroutou is always worth a [[mangan]] at minimum. The lowest scoring hand would have 36 [[fu]] (20 fu for winning; 4 open terminal triplets, worth 4 fu each), which is then rounded up to 40 fu. A 4 han 40 fu hand scores mangan. Such a hand is shown below:
:{{#mjt:11p99s}} {{#mjt:999'm4'443'33z}}  Ron: {{#mjt:1p9s}}


Example:
The lowest scoring honroutou is a [[chiitoitsu]] won by ron without riichi or dora:
:{{#mjt:99m11p1199s22334z}}  Ron: {{#mjt:4z}}
:{{#mjt:99m11p1199s22334z}}  Ron: {{#mjt:4z}}


This hand scores 4 han and 25 fu for 6400(9600) points.
This hand scores 4 han and 25 fu for 6400 (9600) points.


==External links==
==External links==

Latest revision as of 17:23, 22 August 2024

Honroutou 「混老頭」 is a yaku scored when every tile in the hand is either a terminal or an honor tile. The hand must contain at least one honor and one terminal to score honroutou; an all honor hand would be tsuuiisou, while an all terminal hand would be chinroutou.

Honroutou
Type Yaku
Kanji 混老頭
English Terminals and honors
Value 2 han (consider as 4 han)
Speed Slow
Difficulty Hard

Tile pattern

               Agari:   or  

Formation

Because every tile must be a terminal or honor, sequences are not allowed, since a sequence always contains non-terminal tiles. Naturally, a large amount of honors/terminals are required to even consider this yaku. A majority of honroutou hands are open, using pon to complete a triplet-based hand.

Compatibility

Main article: Yaku compatibility

^ Ippatsu requires riichi to be of any use.

RCH DRI IPP SMO TAN PFU IPK ITT YAK SDJ SDO TOI SNA SNK CHA JUN RPK SSG HRO HON CHN CHI RIN HAI HOU CHK
HRO                                                  

Honroutou is not compatible with any yaku which require a sequence, which accounts for most of the incompatibilities (including chankan, which must always win on a sequence wait). Tanyao is incompatible because it requires no terminals or honours, and honroutou requires only those tiles. Chanta is incompatible because it is implied by honroutou. Finally, if honroutou is combined with junchan, the entire hand must be terminals, which gives the chinroutou yakuman.

Value

It is impossible to score this yaku without at least either toitoi or chiitoitsu. Therefore, every hand that scores honroutou is worth at least 4 han.

In toitoi form, honroutou is always worth a mangan at minimum. The lowest scoring hand would have 36 fu (20 fu for winning; 4 open terminal triplets, worth 4 fu each), which is then rounded up to 40 fu. A 4 han 40 fu hand scores mangan. Such a hand is shown below:

               Ron:   

The lowest scoring honroutou is a chiitoitsu won by ron without riichi or dora:

              Ron:  

This hand scores 4 han and 25 fu for 6400 (9600) points.

External links

Honroutou in Japanese Wikipedia
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