Toitoihou: Difference between revisions

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

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Latest revision as of 16:57, 22 September 2024

Toitoihou 「対々和」, often shortened to toitoi 「対々」, is a yaku scored when all four tile groups are triplets (and/or kans), giving it the English name of "All Triplets".

Tile pattern

Agari:

or

Agari:

or

Closed toitoi

Ron:

or

If this hand wins by tsumo, then it counts for the suuankou yakuman. Otherwise, it's a toitoi 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, giving this yaku the nickname of "pon palace". This yaku does not reduce in value once opened.

Viability

Naturally, this yaku is reasonable to go for with many triplets and/or pairs. However, toitoi often looks easier than it actually is. There are only 2 tiles that can convert a pair into a triplet;^[1] there are 8 tiles that can convert a ryanmen into a sequence. While pon can turn pairs into triplets, the tiles needed to pon may not be discarded. The 2 tiles could be in the dead wall, or used in an opponent's hand.

Pairs made out of middle tiles (tiles from 3-7) are particularly hard to pon, because middle tiles are generally more likely to be kept in an opponent's hand. When there are multiple pairs made out of middle tiles, this yaku becomes slower to complete. In addition, a hand with many pairs can also form chiitoitsu.

Some (rough) rules of thumb between toitoi and chitoitsu are:

With 4 pairs and one turns into a sequence or triplet, it is often best to go for the regular hand structure. This may or may not be toitoi. Exception: if the hand is entirely disconnected except for the single sequence/group, then go chiitoitsu.
With 5 pairs, chiitoitsu is preferred. Keeping the option for toitoi is fine (e.g. 4 pairs, 1 triplet, 2 lone tiles. The hand can turn into chiitoi if you discard the triplet, can toitoi if you pon) so long as the pairs are reasonable to pon.
With 4-5 pairs, and one of the pairs cannot be turned into a triplet, because both remaining tiles of the pair are visible, then favor chiitoitsu over toitoi.

Compatibility

Main article: Yaku compatibility

^ 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 is incompatible with any yaku requiring a sequence, meaning pinfu, iipeikou, ittsu, sanshoku doujun, ryanpeikou, and chankan (since it can only win on a sequence wait). It also cannot be combined with chiitoitsu, since it doesn't use mentsu.

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

Notes

↑ 4 copies of each tile, -2 in hand, leaving 2 left in the wall to pon

External links

対々

Toitoihou in Japanese Wikipedia

[1] 4 copies of each tile, -2 in hand, leaving 2 left in the wall to pon

[1]

@@ Line 8: / Line 8: @@
 |gameExample = * [http://tenhou.net/0/?log=2014080608gm-0089-0000-c7c0bd29&tw=0&ts=8 Toitoi] with [[sanshoku doukou]]
 }}
-'''Toitoihou''' {{kana|対々和}}, often shortened to '''toitoi''' {{kana|対々}} is a standard yaku.  In English, it is referred as "all triplets".  That's due in part with every [[mentsu|tile group]] to be composed of [[Mentsu#Koutsu|triplets]].  This hand is immune to any requirement involving the numbered suits or [[Jihai|honor tiles]].  Simply, any group of triplets would suffice.  In terms of [[han]], this yaku is [[kuisagari|not devalued while open]].  Players, whose hands containing multiple pairs, may be encouraged to call on tiles to complete triplets.  With in mind, this yaku also acquired the nickname of "pon palace".
+'''Toitoihou''' {{kana|対々和}}, often shortened to '''toitoi''' {{kana|対々}}, is a [[yaku]] scored when all four [[tile group]]s are triplets (and/or [[kan]]s), giving it the English name of "All Triplets".
 ==Tile pattern==
 :{{#mjt:111444p88s77z}} {{#mjt:33'3z}} Agari: {{#mjt:8s}} or {{#mjt:7z}}
+:{{#mjt:222m99p55z}} {{#mjt:0z44p0z}} {{#mjt:33'3z}} Agari: {{#mjt:9p}} or {{#mjt:55z}}
 ===Closed toitoi===
-:{{#mjt:444z333p666s77m66z}} Agari: {{#mjt:7m}} or {{#mjt:6z}}
+:{{#mjt:444z333p666s77m66z}} Ron: {{#mjt:7m}} or {{#mjt:6z}}
-If this hand wins by [[Menzenchin tsumohou|tsumo]], then it counts for the [[suuankou]] yakuman.  Otherwise, it's a toitoi mixed with [[sanankou]].
+If this hand wins by [[Menzenchin tsumohou|tsumo]], then it counts for the [[suuankou]] yakuman. Otherwise, it's a toitoi mixed with [[sanankou]].
 ==Formation==
-As the name implies, this yaku requires [[Mentsu#Koutsu|koutsu]].  Usually, this yaku is called open due to the ability for [[pon]] to claim discarded tiles from any player.
+As the name implies, this yaku requires [[Mentsu#Koutsu|koutsu]]. Usually, this yaku is called open due to the ability for [[pon]] to claim discarded tiles from any player, giving this yaku the nickname of "[[pon]] palace". This yaku does not reduce in value once opened.
+=== Viability ===
+Naturally, this yaku is reasonable to go for with many triplets and/or pairs. However, toitoi often looks easier than it actually is. There are only 2 tiles that can convert a pair into a triplet;<ref>4 copies of each tile, -2 in hand, leaving 2 left in the wall to pon</ref> there are 8 tiles that can convert a [[ryanmen]] into a sequence. While pon can turn pairs into triplets, the tiles needed to pon may not be discarded. The 2 tiles could be in the [[dead wall]], or used in an opponent's hand.
+Pairs made out of middle tiles (tiles from 3-7) are particularly hard to pon, because middle tiles are generally more likely to be kept in an opponent's hand. When there are multiple pairs made out of middle tiles, this yaku becomes slower to complete. In addition, a hand with many pairs can also form [[chiitoitsu]].
-=== Compatability ===
+Some (rough) rules of thumb between toitoi and chitoitsu are:
-{{main|Yaku compatability}}
+*With 4 pairs and one turns into a sequence or triplet, it is often best to go for the regular hand structure. This may or may not be toitoi. Exception: if the hand is entirely disconnected except for the single sequence/group, then go chiitoitsu.
+*With 5 pairs, chiitoitsu is preferred. Keeping the option for toitoi is fine (e.g. 4 pairs, 1 triplet, 2 lone tiles. The hand can turn into chiitoi if you discard the triplet, can toitoi if you pon) so long as the pairs are reasonable to pon.
+*With 4-5 pairs, and one of the pairs cannot be turned into a triplet, because both remaining tiles of the pair are [[Kabe#Visible TIles|visible]], then favor chiitoitsu over toitoi.
+== Compatibility ==
+{{main|Yaku compatibility}}
 {{Yaku compatibility table|TOI}}
-Toitoi with [[mentsumo]] and [[junchan]] actually form yakuman, as [[suuankou]] and [[chinroutou]] respectively.  Toitoi with [[chanta]] forms [[honroutou]] instead.
+Toitoi is incompatible with any yaku requiring a sequence, meaning [[pinfu]], [[iipeikou]], [[ittsu]], [[sanshoku doujun]], [[ryanpeikou]], and [[chankan]] (since it can only win on a sequence wait). It also cannot be combined with [[chiitoitsu]], since it doesn't use [[mentsu]].
-Toitoit is incompatible with any yaku requiring a sequence, meaning [[pinfu]], [[iipeikou]], [[ittsu]], [[sanshoku doujun]], [[ryanpeikou]], and [[chankan]] (since it can only win on a sequence wait). It also cannot be combined with [[chiitoitsu]], since it doesn't use [[mentsu]].
+Toitoi with [[mentsumo]] and [[junchan]] actually form yakuman, as [[suuankou]] and [[chinroutou]] respectively. Toitoi with [[chanta]] forms [[honroutou]] instead.
-=== Viability ===
+==Notes==
-Naturally, this yaku can be developed when the [[haipai|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.
+{{reflist}}
 ==External links==