Fu: Difference between revisions

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 ==Counting Fu==
 ===Tile groups===
-For shuntsu (sequences), the fu count is 0.  For koutsu (triplet) and kantsu (four-of-a-kind), the fu value depends on whether they are [[tanyaohai]] (simples) or [[jihai]]/[[routouhai]] (honor/terminals).
+For shuntsu (sequences), the fu count is 0. For koutsu (triplet) and kantsu (four-of-a-kind), the fu value depends on whether they are [[tanyaohai]] (simples) or [[jihai]]/[[routouhai]] (honor/terminals).
 {| class="wikitable"
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 ===Waits===
-The different [[machi|basic wait patterns]] count for fu as well.  [[Complex machi|Combination wait patterns]] are not listed, such as [[nobetan]], [[sanmentan]], and [[ryanmenten]].  Both nobetan and sanmentan counts for [[tanki]]; and ryanmenten counts for [[ryanmen]].  Other combination patterns factor fu the same as the basic patterns listed here.  However, the fu counts only one time.  For example, a combination of tanki and [[kanchan]] only generates 2 fu from one pattern but not for both.
+The different [[machi|basic wait patterns]] count for fu as well.
-As for [[shanpon]], the fu generated with this pattern rests on the [[koutsu|tile groupings]] themselves as indicated in the above table.
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 |-
 | Open wait || [[Ryanmen]] ||align=center| 0 fu
+|-
+| Dual pair wait || [[Shanpon]] ||align=center| 0 fu*
 |-
 | Closed wait || [[Kanchan]] ||align=center| 2 fu
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 | Pair wait || [[Tanki]] ||align=center| 2 fu
 |}
+<nowiki>*</nowiki> Gains fu by completing a triplet.
+[[Complex waits]] can always be split into multiple types of basic wait. For example, a 23456 [[sanmentan]] can be considered as either as {23} wait or a {56} wait. Both these are ryanmen, so a sanmentan is considered a type of ryanmen wait. Other examples:
+*A [[nobetan]] can be counted as two individual tanki waits, so it always scores 2 fu from tanki.
+*A [[ryantan]] counts as ryanmen if it wins by completing the sequence, and a tanki if it wins by completing the pair.
+*A [[pentan]] counts as penchan if it wins by completing the sequence, and a tanki if it wins by completing the pair. Since penchan and tanki are worth the same fu, there isn't a practical difference between the two.
+*An [[ayranmen]], like 6788-pin, is always counted as a ryanmen if it wins off a 5-pin. If it wins off the 8-pin, however, it may be counted as a ryanmen or as a tanki. The interpretation with the highest score is used (see below for details).
 ===Yakuhai pair===