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'''Atozuke''' {{kana|後付け}} describes a "yakuless" [[tenpai]] which gains [[yaku]] upon winning. In other words, the current state of the hand does not produce yaku while tenpai. This typically involves an open hand, but can also apply to closed hands without [[riichi]]. It is also called '''sakizuke''' {{kana|先付け}}.
'''Atozuke''' {{kana|後付け}} describes a "yakuless" [[tenpai]] which gains [[yaku]] upon winning. In other words, the current state of the hand does not produce yaku while tenpai. This typically involves an open hand, but can also apply to closed hands without [[riichi]]. It is also called '''sakizuke''' {{kana|先付け}}.


When a hand is subject to atozuke, it may still win if it draws the "[[takame|higher value]]" tile. However, it is normally unable to win off the "[[yasume|lesser]]" tile, since it would lack yaku. If the lesser tile is drawn, the hand may be subject to [[furiten]].
When a hand is subject to atozuke, it may win if it draws the "[[takame|higher value]]" tile. However, it is usually unable to win off the "[[yasume|lesser]]" tile, since it would lack yaku. Such hands may still win with the lesser tile if it gains a conditional yaku (like [[haitei]] or [[rinshan]]). Otherwise, it cannot win. Thus, if the lesser tile is drawn, the hand may be subject to [[furiten]].


Atozuke is subject to [[Rule variations#Atozuke|rule variations]]. When the atozuke rule is disabled ("atozuke nashi"), you must have a confirmed yaku before winning (and sometimes, before making any call). The more common rule, by far, is to allow atozuke. Rules disabling atozuke are rare, mostly found in specific [[jansou|mahjong parlor]]s.
Atozuke is subject to [[Rule variations#Atozuke|rule variations]]. When the atozuke rule is disabled ("atozuke nashi"), you must have a confirmed yaku before winning (and sometimes, before making any call). The more common rule, by far, is to allow atozuke. Rules disabling atozuke are rare, mostly found in specific [[jansou|mahjong parlor]]s.
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  {{#mjt:111m456s99p55z}} {{#mjt:7'89s}}  Agari: {{#mjt:9p}} or {{#mjt:5z}}
  {{#mjt:111m456s99p55z}} {{#mjt:7'89s}}  Agari: {{#mjt:9p}} or {{#mjt:5z}}


This time, the same tiles from the above hand has an [[chii|open call]]. At it stands, it needs the haku in order to win (or a conditional yaku like houtei).
This is the same hand but with an [[naki|open call]]. This hand can only win by haku, regardless of tsumo or ron.


=== Tanyao ===
=== Tanyao ===
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  {{#mjt:234567m22p78s}} {{#mjt:4'56p}}  Agari: {{#mjt:6s}} or {{#mjt:9s}}
  {{#mjt:234567m22p78s}} {{#mjt:4'56p}}  Agari: {{#mjt:6s}} or {{#mjt:9s}}


[[Tanyao]] can only be achieved when won with 6-sou.
[[Tanyao]] can only be achieved when won with the 6-sou.


=== Sanshoku ===
=== Sanshoku ===
  {{#mjt:1112s111678p}} {{#mjt:11'1m}}  Agari: {{#mjt:2s}} or {{#mjt:3s}}
  {{#mjt:1112s111678p}} {{#mjt:11'1m}}  Agari: {{#mjt:2s}} or {{#mjt:3s}}


This hand has an apparent yaku of [[sanshoku doukou]]. However, the latter wait of 3-sou would create a sequence of 1-2-3 sou, as it triggers the effect applied by [[yasume|the lesser valued tile]]. Thus, it only has a yaku when won with the 2-sou.
This hand has an apparent yaku of [[sanshoku doukou]]. However, if won with the 3-sou, the hand will contain a 11-sou pair and a 123-sou sequence, ruining the yaku. Thus, it only has a yaku when won with the 2-sou.


  {{#mjt:1234567s123p}} {{#mjt:2'13m}}  Agari: {{#mjt:1s}} or {{#mjt:4s}} or {{#mjt:7s}}
  {{#mjt:1234567s123p}} {{#mjt:2'13m}}  Agari: {{#mjt:1s}} or {{#mjt:4s}} or {{#mjt:7s}}
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The open call on the [[hatsu|green dragon]] instantly gives the hand a yaku via [[yakuhai]].  
The open call on the [[hatsu|green dragon]] instantly gives the hand a yaku via [[yakuhai]].  
{{#mjt:123s4567m123p}} {{#mjt:2'13m}}  Agari: {{#mjt:4m}} or {{#mjt:7m}}
[[Sanshoku]] is already embedded in the hand.


  {{#mjt:23444m33344z}} {{#mjt:11'1m}}  Agari: {{#mjt:1m}} or {{#mjt:4m}} or {{#mjt:4z}}
  {{#mjt:23444m33344z}} {{#mjt:11'1m}}  Agari: {{#mjt:1m}} or {{#mjt:4m}} or {{#mjt:4z}}
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When the atozuke rule is disabled, the hand must have a confirmed yaku before winning. There are two main variations to atozuke disabled:
When the atozuke rule is disabled, the hand must have a confirmed yaku before winning. There are two main variations to atozuke disabled:


# The hand must have a specific yaku confirmed before winning and before calling any tile. Therefore, a hand that could always win with atozuke enabled may not be allowed to win.
# The hand must have a specific yaku confirmed before winning. In addition, when calling, it must have a specific yaku confirmed without needing to make another call and without needing the winning tile. (In most cases, this is equivalent to "you must confirm a yaku when you make the first call".)
# The hand must have a yaku no matter which tile it wins on. Any hand that always has a yaku can win.
# The hand must have a yaku no matter which tile it wins on. Any hand that always has a yaku (any yaku) by the end can win.


To repeat, the atozuke rule is most often enabled. When atozuke is enabled, all of the following types of hand can win without issue.
=== Two different yaku===
  {{#mjt:789m789p67878s55z}} Agari: {{#mjt:6s}} or {{#mjt:9s}}
  {{#mjt:789m789p67878s55z}} Agari: {{#mjt:6s}} or {{#mjt:9s}}


If this hand wins from 6-sou, it gains [[iipeikou]]. If it wins from 9-sou, it gains [[sanshoku]]. '''When the atozuke rule is enabled, this hand can win no matter what.''' Both winning tiles give a yaku, so it always has a yaku, so it can win regardless of the tile. Similarly, when rule #2 is used, this hand can win.
If this hand wins from 6-sou, it gains [[iipeikou]]. If it wins from 9-sou, it gains [[sanshoku]]. When the atozuke rule is enabled, this hand can win no matter what. Both winning tiles give a yaku, so it always has a yaku, so it can win regardless of the tile. Likewise, when rule #2 is used, this hand is allowed to win.


But when rule #1 is used, this hand cannot win. Neither iipeikou nor sanshoku are confirmed. Because this hand does not ''guarantee'' "iipeikou", "sanshoku", or any other specific yaku in its current state, it cannot win. (Of course, since this is a closed hand, you can just call [[riichi]].)
But when rule #1 is used, this hand cannot win. Neither iipeikou nor sanshoku are confirmed. Because this hand does not ''guarantee'' "iipeikou", "sanshoku", or any other specific yaku in its current state, it cannot win. (Of course, since this is a closed hand, you can just call [[riichi]].)
Note: when a yaku is not guaranteed because it is implied by another yaku, e.g. when a hand can score [[sanankou]] or [[suuankou]], atozuke does not apply, even when using rule #1.


  {{#mjt:123m456p567s5577z}} Agari: {{#mjt:5z}} or {{#mjt:7z}}
  {{#mjt:123m456p567s5577z}} Agari: {{#mjt:5z}} or {{#mjt:7z}}
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This hand would gain a yakuhai triplet if it wins off the haku or chun. However, it does not have any yaku in the current state, and so it cannot win if rule #1 is in effect.
This hand would gain a yakuhai triplet if it wins off the haku or chun. However, it does not have any yaku in the current state, and so it cannot win if rule #1 is in effect.


  {{#mjt:123456m67p6'66z7'89s}} Agari: {{#mjt:5s}} or {{#mjt:8s}}
=== Yaku confirmed post-call ===
  {{#mjt:123456m67p6'66z7'89s}} Agari: {{#mjt:5p}} or {{#mjt:8p}}
 
This hand has a confirmed yaku through the triplet of hatsu. However, it did not have any yaku when calling the 789-sou, and 't needed another call to confirm the yaku. Therefore, this hand cannot win when rule #1 is in effect. With rule #2, this hand can win normally.


This hand has a confirmed yaku through the triplet of hatsu. However, ''it did not have any yaku when calling the 789-sou''. Therefore, this hand cannot win when rule #1 is in effect. Note: for whole hand yaku, like [[honitsu]], the yaku can be scored even if the yaku wasn't complete at the time of calling. Similarly, calling for [[chanta]]/[[junchan]] is allowed so long as your final wait guarantees the yaku.
{{#mjt:123456m13p66z1'23s}} Agari: {{#mjt:2p}}


{{#mjt:123456m67p666z7'89s}} Agari: {{#mjt:5s}} or {{#mjt:8s}}
Despite sanshoku being guaranteed with the winning tile, because the sanshoku was not complete ''before reaching tenpai'', this hand cannot win under rule #1.


When the hatsu triplet is closed, the hand can always win, even under rule #1. (Even if the hatsu triplet was not there when 789-sou was called, there would be practically no way to enforce it, so "drawing the hatsu triplet after calling" play is technically allowed.)
{{#mjt:123456m67p666z7'89s}} Agari: {{#mjt:5p}} or {{#mjt:8p}}


To repeat, the atozuke rule is most often enabled. When atozuke is enabled, all these types of hand can win without issue.
When the hand's ''closed section'' guarantees a specific yaku, and the winning tile is not related to completing said yaku, the hand is never subject to atozuke. Even under rule #1, it will always be eligible to win.
*In this case, the hand has a closed hatsu triplet, so it can always win. Even if the hatsu triplet was drawn after the 789-sou call, there would be no practical way to prove you didn't have the hatsu triplet before calling. Therefore, "drawing yaku after calling" is allowed so long as you "complete" the yaku before winning.
*For whole hand yaku, like [[honitsu]] and [[chanta]], the hand's closed section is considered to have "guaranteed the yaku". Therefore, even if the hand didn't qualify for honitsu at the time of the first call, you can win with an open honitsu-only hand. (For a yaku like chanta, your waits still need to guarantee chanta to not be atozuke.)


== Strategy ==
== Strategy ==
Hordes
695

edits

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