Pinfu: Difference between revisions

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Pinfu (view source)

Revision as of 09:17, 6 April 2024

146 bytes removed ,  6 April
put the definition of pinfu above "these hands have all sequences but are not pinfu"
VisualWikitext
(put the definition of pinfu above "these hands have all sequences but are not pinfu")
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The winning tile completes the last sequence, which is worth 0 fu, making the hand pinfu.
The winning tile completes the last sequence, which is worth 0 fu, making the hand pinfu.


==English reference==
==Definition==
{{main|Fu}}
{{main|Fu}}


In English, pinfu is sometimes referred to as "all sequences". However, the yaku is not as simple as that. Other than having an open hand, it is possible for a hand to be composed of all sequences and still not be classed as a pinfu.  
In English, pinfu is sometimes referred to as "all sequences". However, the yaku is not as simple as that. There are hands that have all sequences and are not valid for pinfu.
 
The exact definition of pinfu is a hand that has no [[fu]], other than the fu from winning. To score pinfu:
*The hand must be closed.
*The hand cannot have any triplets or quads - it must be all sequences.
*The pair cannot be composed off [[yakuhai]] - the pair cannot be the round wind, seat wind, or a dragon.
*The hand must have a [[ryanmen]] wait. A ryanmen wait is two consecutive tiles waiting to complete either side of sequence, such as {23} or {45}.
**The pair must be complete before reaching tenpai. This means that the "two-sided" [[nobetan]] does not count.
**[[Complex wait]]s can score pinfu if they are composed off of ryanmen waits. Therefore, a [[sanmenchan]] wait always counts. [[Ryantan]] counts if you win by completing the sequence (e.g. a wait of {4555} only scores pinfu if you win with 3 or 6).
 
If you know what fu is, the requirements for pinfu make sense. Triplets and quads score at least 2 fu each. A yakuhai pair scores 2 fu. A non-ryanmen wait scores 2 fu. By avoiding these sources of fu, you gain pinfu. Pinfu ''is'' allowed to score the 10 fu from winning from a closed [[ron]].
 
As an exception, pinfu does not score fu from [[tsumo]] (win from self draw). Normally, a win by self draw is worth 2 fu. When a hand wins with pinfu, these 2 fu are waived. Thus, a pinfu tsumo is worth 20 fu, but gains +1 han from [[menzen tsumo]].


===Counter examples===
===Counter examples===
The following examples are all "all sequence hands"; but they are not pinfu.
The following examples are all "all sequence hands", but they are not pinfu.


{| class="wikitable"
{| class="wikitable"
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|width=50%| This hand qualifies for pinfu using either 6-pin or 9-pin.  However, the first tile, 3-pin, functions as tanki.  Coupled with the 6-pin, it is on a 3-6 [[nobetan]].  Nevertheless, 6-pin still qualifies for pinfu, because the han increase takes precedence over fu.
|width=50%| This hand qualifies for pinfu using either 6-pin or 9-pin.  However, the first tile, 3-pin, functions as tanki.  Coupled with the 6-pin, it is on a 3-6 [[nobetan]].  Nevertheless, 6-pin still qualifies for pinfu, because the han increase takes precedence over fu.
|}
|}
==Fu==
{{main|Fu}}
To understand pinfu, players must understand the nature of '''fu''', or mini-points.  Fu are a set of points associated with hand composition.  In the case of pinfu, the relevant sources of fu comes from the tile groups and the wait patterns.  The only wait pinfu gains fu involves the 10 fu gained from winning with a closed ron.
Therefore, pinfu must avoid these patterns:
* Any koutsu or kantsu is worth at least 2 fu. A pinfu hand must have four shuntsu.
* Winning from a [[tanki]], [[kanchan]], or [[penchan]] wait is worth 2 fu.
* A pair of [[yakuhai]], i.e., dragons, the round wind, or the seat wind, is worth 2 fu. A pinfu hand must have a valueless pair.
* An open hand worth 20 fu is counted as 30 fu. Pinfu may only be awarded to a closed hand.
In the end, a pinfu hand must win from a [[ryanmen]] wait, or a complex wait that includes ryanmen (such as [[ryanmenten]] or [[ryantan]]). In other words, the winning tile must complete an open [[shuntsu]] (sequence).
As an exception, pinfu with [[mentsumo]] gains 0 fu from tsumo, or winning by self-draw.  Normally, a winning tile drawn from the wall is worth 2 fu. In turn, the hand qualifies as pinfu, and these 2 fu are waived. The hand is then scored at 20 fu; and at least 2 han for [[Menzen tsumo|menzen tsumo]] and pinfu. Some rule variations may not allow waiving these fu, and score such a hand as 30 fu, tsumo, without pinfu. Such variations are rare.


==Compatibility==
==Compatibility==
Hordes
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