Fu: Difference between revisions

If the hand's pair is of tiles that would score [[yakuhai]] in a koutsu, then this scores 2 fu. If the pair doubles up as both the round wind and the seat wind, it may score 2 fu, or 4 fu. That is dependent on which [[Scoring variations#Double Wind Fu|scoring rule]] is used for this case.

* Winning with a closed hand by ron, the hand is awarded 10 fu. These 10 fu are called ''menzen-kafu'' and do not count against the player for achieving [[pinfu]].

* A win by tsumo with an open or closed hand is worth 2 fu.

* An exception to the fu for tsumo is a closed hand that satisfies all other criteria for [[pinfu]]. Such a hand does not score 2 fu for tsumo and instead gains the han for pinfu.

* Depending on the [[Scoring variations#Rinshan Fu|scoring rules]] used, a hand won with a kan replacement tile may also be ineligible for the 2 fu for tsumo, instead scoring only the han for [[rinshan kaihou]].

* An open hand won by ron without any fu from koutsu or the waiting pattern (i.e. 20 fu) is forced to 30 fu. This is often described as being worth 2 fu for an open pinfu.

==Maximal Score==

When a hand can be interpreted to have won with multiple different types of basic wait, the interpretation that scores the most final points is always used. This is always the interpretation that scores the most han; it may not score the most fu. The most common reason for this is for [[pinfu]].

This is the same hand, except open. Pinfu cannot be scored when open. Therefore, the hand scores the +2 fu from kanchan, because that is worth more points. For this hand there is no functional difference (the hand ends up rounding to 30 fu either way), but it can matter for other hand compositions.

:{{#mjt:789m66678999p789s}} Agari: {{#mjt:5z}}

A hand with 1 han and 110 fu is an exceptionally rare hand.  Its requirements are particularly limited, because the hand must be composed of all, not just some, the conditions in the following example.

 

This is the greatest fu count for any hand worth 1 han, and is only attainable if double winds score 4 fu. If the hand is won by tsumo, then [[sanankou]] and [[mentsumo]] will be scored; if the triplet of [[ton|east]] is closed, then [[sanankou]] will still be scored. Finally, the last group must be a sequence, or [[toitoi]] would be scored. In these cases, this would add han to the hand.  

With the [[mangan]] limit applied, counting this many fu for anything 3 han or higher is no longer relevant, because any han with 70 fu or more is capped at mangan.  If the [[aotenjou]] scoring system is used however, high fu counts remain relevant towards point calculation.

Technically, [[pinfu]] cannot be a yaku while open. However, some open hands produce 0 fu based on composition alone.

{{#mjt:123m45p22s}} {{#mjt:2'34p6'57s}} Waiting on: {{#mjt:3p}} or {{#mjt:6p}}

This is an open "yakuless" hand.  When closed, it resembles that of pinfu. Counting the fu from this hand, it produces 0 fu other than the base 20 fu for every hand.  A hand like this can still gain yaku worth 1-han from either [[chankan]], [[haitei]], or [[houtei]]. As far as hands go, this pattern generates an exception to the rule behind counting fu; and as a special case, it is granted 2 fu in order to be rounded up to 30 fu.

Counting fu for [[toitoi]] is a bit trickier but only ''open'' [[toitoi]] hands need to be considered: if you win a closed [[toitoi]] hand by tsumo, it's a yakuman ([[suuankou]]) and if you win a closed [[toitoi]] hand by ron, it's a mangan or higher ([[toitoi]] + [[sanankou]]). Also, a [[toitoi]] hand with only terminals/honors is [[honroutou]], also worth at least a mangan. Thus, an open [[toitoi]] hand with no quads for which counting fu actually matters will almost always score 40 fu.