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==Kuisagari==
==Kuisagari==
{{main|List of yaku}}
{{main|Menzenchin#Yaku}}


'''Kuisagari''' {{kana|喰い下がり}} is a property of some yaku to lose value when [[naki|called open]]. When calling a discard and opening the hand, the player sacrifices 1-han per yaku affected by this rule. This is obviously a negative, though calling allows you to complete the hand faster.
'''Kuisagari''' {{kana|喰い下がり}} is a property of some yaku to lose value when [[naki|called open]]. When the hand is open, these yaku lose 1 han each:
 
The following yaku are affected directly by kuisagari:


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Similarly, some yaku can only be scored with a closed hand. Certain yaku, like [[chiitoitsu]] and [[mentsumo]], are closed based on their structure or nature. Other yaku, like [[iipeikou]], the requirement of a closed hand is entirely artificial. Unlike instances of kuisagari, you cannot use these yaku to fulfill the yaku requirement of an open hand: these are not considered 0 han yaku. For [[ryanpeikou]] in particular, if it were affected by kuisagari, it would score 2 han when opened. But in actuality, you cannot achieve ryanpeikou at all with an open hand.
Some yaku can only be scored in a closed hand (distinct from kuisagari). For example, [[ryanpeikou]] is impossible to score with an open hand, rather than just dropping from 3 -> 2 han. The other yaku can be scored open without penalty.


Finally, some yaku are not affected by kuisagari.  Even when open, they retain their original han value. These are [[yakuhai]], [[toitoi]], [[sanankou]], [[sanshoku doukou]], [[shousangen]], [[sankantsu]], as well as any [[yakuman]] that can be scored with an open hand.
==Atozuke==
{{main|Atozuke}}


===Atozuke===
'''Atozuke''' is when a hand has no guaranteed yaku, but can gain yaku if won with a certain tile. This means some times cannot be won off of due to a lack of yaku.
{{main|Atozuke}}
 
Example:
 
{{#mjt:111m456789s99p55z}}  Agari: {{#mjt:9p}} or {{#mjt:5z}}


A side effect to kuisagari involves '''atozuke'''.  Tile calls may put a hand into position where one of its waiting tiles do not produce valid yaku.  With this in mind, tile calls must be made with careful discretion.
If the hand obtains the [[haku]], it gains the yaku of [[yakuhai]]. If it obtains the 9-pin, it cannot win due to a lack of yaku.


== Closed tile calls ==
== Closed tile calls ==
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