Toitoihou

Toitoihou

Type	Yaku
Kanji	対々
English	All triplets
Value	2 han
Speed	Medium
Difficulty	Easy

Toitoihou 「対々」, often called toitoi is a standard yaku. In English, it is referred as "all triplets"; and it also acquired the nickname of "pon palace". That's due in part with every tile group to be composed of triplets. With this in mind, this hand is immune to any requirement involving the numbered suits or honor tiles. Simply, any group of triplets would suffice. This yaku is not affected by kuisagari, where the hand is devalued in terms of han while open.

Tile pattern

Agari: or

Closed toi toi

Agari: or

If this hand wins by tsumo, then it counts for the suuankou yakuman. Otherwise, it's a toi toi mixed with sanankou.

Formation

As the name implies, this yaku requires koutsu. Usually, this yaku is called open due to the ability for pon to claim discarded tiles from any player.

Compatability

Main article: Yaku compatability

^ Ippatsu requires riichi to be of any use.

RCH

DRI

IPP^

SMO

TAN

PFU

IPK

ITT

YAK

SDJ

SDO

TOI

SNA

SNK

CHA

JUN

RPK

SSG

HRO

HON

CHN

CHI

RIN

HAI

HOU

CHK

TOI

Toitoi with mentsumo and junchan actually form yakuman, as suuankou and chinroutou respectively. Toitoi with chanta forms honroutou.

Viability

Naturally, this yaku can be developed when the start hand, or later subsequent tile draws, produces a number of pairs or even triplets. As the yaku requires, every tile group must be a triplet, which may be acquired via the tile draws or player discards (pon). However, if the hand happens to develop with a concentration of pairs (normally 4 or 5 pairs), then a player may actually opt to develop chiitoitsu instead. A hand with 6 pairs is already tenpai for chiitoitsu, which renders a chase for toitoi to be rather pointless.

External links

• 対々

Toitoihou in Japanese Wikipedia