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mention closed tile groups
(mention closed tile groups)
 
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In addition, any [[yakuman]] that can be scored open do not lose value if opened.
In addition, any [[yakuman]] that can be scored open do not lose value if opened.
==Closed/Open Tile Groups==
{{Main|Mentsu|Naki}}
A ''[[tile group]]'' is considered open if it was completed by [[chii]], [[pon]], open [[kan]], or [[ron]]. This is distinct from the ''hand'' being closed, as hands are not opened by ron (the hand only opens after chii/pon/open kan).
This distinction is important for two reasons:
* Two [[yaku]] (and only two yaku) care about closed tile groups: [[sanankou]] and [[suuankou]]. Every other yaku only checks if the hand is closed. For example, it is possible to score [[iipeikou]] with a hand won by ron, even if the iipeikou was completed by the ronned tile.
* Closed triplets and closed kans are worth more fu than their open counterparts. (Sequences are unaffected.)


==Strategy==
==Strategy==
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