Sanankou: Difference between revisions

Sanankou
Type	Yaku
Kanji	三暗刻
English	Three concealed triplets
Value	2 han
Speed	Medium
Difficulty	Medium

Revision as of 18:15, 4 January 2025

Sanankou 「三暗刻」 is a yaku obtained when the hand has three concealed triplets (ankou). A concealed kan counts as a concealed triplet. It can be completed with an open or closed hand.

The third triplet may not be completed off another player's discard (ron), as the triplet would not be "concealed". However, the third triplet may be completed by tsumo. Note that sanankou and the related suuankou are the only two yaku that care whether the tile group is closed; all other yaku only check if the hand itself is closed.

Tile pattern cases

1. Case where the yaku is guaranteed:

Agari:

2. Case where the hand must be won by tsumo:

Tsumo:

or

3. Case where the hand is won by discard.

Ron:

or

Note: A tsumo results in the suuankou yakuman.

Formation

This yaku requires three closed triplets, leaving room for one tile group of any type.

Suuankou tenpai

A closed tenpai hand with both sanankou and toitoi is tenpai for suuankou.

If the hand has a shanpon wait and wins by discard, the hand is not counted as suuankou, and instead scores sanankou + toitoi. This is because a triplet by ron is considered opened and thus disqualifying suuankou.

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
SNA

Sanankou is incompatible with any yaku requiring more than one sequence, those being pinfu, iipeikou, ittsu, sanshoku doujun, and ryanpeikou. It is also incompatible with chiitoitsu, which requires no mentsu at all.

A natural combination involves toitoi:

An "all triplet" hand with 1 open group scores sanankou + toitoi if a triplet is completed by tsumo, or if all triplets are complete at tenpai. If a triplet is completed by ron it scores only toitoi.
A closed "all triplet" hand scores suuankou if a triplet is completed by tsumo, or if all triplets are complete at tenpai. If a triplet is completed by ron it scores sanankou + toitoi.

External links

三暗刻

Sanankou in Japanese Wikipedia

@@ Line 36: / Line 36: @@
 === Suuankou tenpai ===
-A closed tenpai hand with both sanankou and [[toitoi]] is tenpai for [[suuankou]]. When this hand wins by discard, then the hand is not counted as suuankou.  Instead, it is the combination of sanankou and toitoi.  The fourth triplet completed by the discarded tile counts as an "open triplet", rather than a fourth closed one.
+A closed tenpai hand with both sanankou and [[toitoi]] is tenpai for [[suuankou]].
+If the hand has a [[shanpon]] wait and wins by discard, the hand is not counted as suuankou, and instead scores sanankou + toitoi. This is because a triplet by ron is considered opened and thus disqualifying suuankou.
 == Compatibility ==
@@ Line 45: / Line 47: @@
 Sanankou is incompatible with any yaku requiring more than one sequence, those being [[pinfu]], [[iipeikou]], [[ittsu]], [[sanshoku doujun]], and [[ryanpeikou]]. It is also incompatible with [[chiitoitsu]], which requires no [[mentsu]] at all.
-A natural combination involves [[toitoi]].
+A natural combination involves [[toitoi]]:
 * An "all triplet" hand with 1 open group scores sanankou + toitoi if a triplet is completed by tsumo, or if all triplets are complete at tenpai. If a triplet is completed by ron it scores only toitoi.
-* A closed "all triplet" hand scores [[suuankou]] if a triplet is completed by tsumo, or if all triplets are complete at tenpai. If a triplet is completed by ron it scores sananoku + toitoi.
+* A closed "all triplet" hand scores [[suuankou]] if a triplet is completed by tsumo, or if all triplets are complete at tenpai. If a triplet is completed by ron it scores sanankou + toitoi.
 ==External links==