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Pinfu: Difference between revisions
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*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 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 a "two-sided" [[nobetan]] wait does not count, it has to be a wait to complete a sequence. | **The pair must be complete before reaching tenpai. This means that a "two-sided" [[nobetan]] wait does not count, it has to be a wait to complete a sequence. | ||
**[[Complex waits]] can score pinfu if they are composed off of ryanmen waits. | **[[Complex waits]] can also score pinfu if they are composed off of ryanmen waits. A [[sanmenchan]] wait, such as {34567}, always counts as a ryanmen wait, because it can be interpreted as {34 + 567} (a ryanmen wait) or {345 + 67} (also a ryanmen wait). [[Ryantan]] counts only 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 how fu is scored, 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. Therefore, by having a closed hand that avoids all extra sources of fu, you gain pinfu. Pinfu ''is'' allowed to score the 10 fu from winning from a closed [[ron]]. | If you know how fu is scored, 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. Therefore, by having a closed hand that avoids all extra 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, | 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, and is the only hand that can be worth 20 fu. (Open hands with 0 fu gain +2 fu for being open.) | ||
===Counter examples=== | ===Counter examples=== | ||
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==Value== | ==Value== | ||
By definition, pinfu has | By definition, pinfu has the minimum possible fu: a pinfu ron has 30 fu, while a pinfu tsumo has 20 fu. Therefore, for hands below [[mangan]], a hand with pinfu will result is less points than other hands with the same han value. To demonstrate: | ||
*Riichi + Pinfu ron (2 han 30 fu) = 2000 points | *Riichi + Pinfu ron (2 han 30 fu) = 2000 points | ||
*Riichi + Tanyao ron (2 han 40 fu) = 2600 points | *Riichi + Tanyao ron (2 han 40 fu) = 2600 points | ||
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*Riichi + Mentsumo + Tanyao (3 han 30 fu) = 4000 points | *Riichi + Mentsumo + Tanyao (3 han 30 fu) = 4000 points | ||
Of course, pinfu still increases your score (riichi + tanyao + pinfu | Of course, pinfu still increases your score due to the +1 han (riichi + tanyao + pinfu > riichi + tanyao). Also, once the hand reaches [[mangan]] or higher, fu no longer matter, so pinfu is worth the same as any other 1-han yaku. | ||
==Compatibility== | ==Compatibility== | ||
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{{Yaku compatibility table|PFU}} | {{Yaku compatibility table|PFU}} | ||
Pinfu is incompatible with any yaku that requires a [[ankou|triplet]], including [[rinshan]]. It is similarly incompatible with [[chiitoitsu]], which does not use [[mentsu]] at all. On the other hand, pinfu works any sequential based yaku. As long as the hand is closed, the pair does not produce "[[Scoring#Fu|fu]]", and the wait is [[ryanmen|open]], then pinfu may be applied. | |||
==Usage== | ==Usage== | ||
Pinfu is one of the most common yaku. | Pinfu is one of the most common yaku. While complex, the requirements are not difficult to meet. | ||
*When playing with a closed hand, sequences are much easier to complete than triplets, so having "all sequences" is reasonably common. | |||
*[[Ryanmen]] waits have better [[tile efficiency]] than other waits, so players will normally gather and keep ryanmen in their hand. | |||
*Pairs are even easier to complete than sequences. | |||
Therefore, by aiming to complete a closed hand quickly, players will often end up scoring this yaku as a byproduct. While pinfu won't be as fast as [[tanyao]] or [[yakuhai]], because it cannot be scored open, this yaku is still seen often. | |||
It naturally combines with other sequence based yaku, namely [[iipeikou]], [[sanshoku doujun]], and [[ittsuu]]. | It naturally combines with other sequence based yaku, namely [[iipeikou]], [[sanshoku doujun]], and [[ittsuu]]. | ||