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{{Infobox yaku | |||
|type = Yaku | |||
|kanji = 七対子 | |||
|english = Seven pairs | |||
|value = 2 han (Closed only) | |||
|yakuSpeed = Medium | |||
|difficulty = Medium | |||
|yakuCombine = * [[Tanyao]] | |||
* [[Honroutou]] | |||
* [[Honitsu]] | |||
* [[Chinitsu]] | |||
|gameExample = * [http://tenhou.net/0/?log=2013010402gm-0009-7447-x1ba0b4910bee&tw=3&ts=2 Chiitoitsu] | |||
* [http://tenhou.net/0/?log=2012121311gm-0009-7447-x1c540c2ae0eb&tw=2&ts=4 Chiitoitsu] as [[kazoe]] | |||
}} | |||
'''Chiitoitsu''' {{kana|七対子}}, also known as '''chiitoi''' or '''niconico''', is one of the standard yaku hands. This hand consists of seven pairs. Under most rulesets, no two pairs may be identical. However, certain [[Yaku_variations#Chiitoitsu|house rules]] may allow duplicate pairs. This hand is one of the two exceptions of the "four melds and one pair" rule of forming a hand, where the other exception is the [[kokushi musou]]. This hand is closed only. | |||
==Tile diagram== | ==Tile diagram== | ||
{{#mjt: | {{#mjt: 11334m55p22s3355z}} Winning tile: {{#mjt: 4m}} | ||
== | ==Development== | ||
Tenpai for chiitoitsu always uses the wait of [[tanki]] (pair wait) in order to complete the seventh and last pair for the hand. | |||
Given the number of pairs in this hand, it is often tempting to call pon to turn pairs into triplets. However, [[toitoi]] is generally slower if you do not have any [[ankou]] (triplets) yet. This is especially true if the hand sits at [[iishanten]] for chiitoitsu. | |||
This hand | |||
== | Nevertheless, transitioning to other yaku may be favorable if the hand develops at least one [[ankou]]. In this case, players may find themselves looking to develop a toitoi hand, [[sanankou]], or even [[suuankou]]. Whatever the case may be, this consideration takes some discretion, particularly when taking into account the number of tiles available, current point standing, and/or number of tile draws remaining. | ||
Also, note that the pairs must be distinct; having four of the same tile does not count as two pairs under standard rulesets. Even in rules that do allow four-of-a-kind to count as two pairs, a call for "[[kan]]" would not count, as a kan is treated as a triplet. | |||
===Hand interpretation=== | |||
Unlike most mahjong hands, chiitoitsu is an exception to the "four [[Mentsu|groups]] and a pair" pattern. Instead, tiles are groups into pairs or toitsu. As such, the tile groupings cannot be interpreted other ways. For this reason, chiitoitsu is also granted a unique fu count of 25, which remains static. | |||
===Shanten=== | |||
The shanten count for chiitoitsu is simpler to count, which can be marked by the number of pairs in the hand. | |||
{| class="wikitable" | |||
|- | |||
! Shanten !! Pair count !!width=40%| Hand !! Comment | |||
|- | |||
| Tenpai || 6 || {{#mjt:11m4477p8899s116z}} ||rowspan=2|Obvious choice for chiitoitsu while in tenpai or 1-shanten. The choice of [[riichi]] will depend on the waiting tile, [[Kyoku|current hand]], and [[Situational analysis|current score]]. | |||
A 1-shanten hand waits to pair one of three tile types for tenpai. Upon attaining tenpai, one of the three must be discarded. | |||
|- | |||
| 1 || 5 || {{#mjt:11m4477p8899s136z}} | |||
|- | |||
| 2 || 4 || {{#mjt:11m2447p8899s136z}} || A hand with four pairs may consider for chiitoitsu. Only one more pair is needed to get to 1-shanten. | |||
|- | |||
| 3 || 3 || {{#mjt:11m2447p6899s136z}} || A hand with three pairs is very inefficient. | |||
|- | |||
| 4 || 2 || {{#mjt:16m2447p6899s136z}} ||rowspan=2|Attempting chiitoitsu with this start is very unreasonable. If anything a hand of this composition is better off utilizing other yaku. | |||
|- | |||
| 5 || 1 || {{#mjt:16m2457p6899s136z}} | |||
|} | |||
== Compatibility == | |||
{{main|Yaku compatibility}} | |||
{{Yaku compatibility table|CHI}} | |||
The composition of this yaku makes it very restrictive regarding its combination with other yaku. Chiitoitsu cannot be combined with any yaku dependent on [[mentsu|tile groups of three]], as this yaku consists of only pairs. Chiitoitsu combined with [[chanta]] gives [[honroutou]], and it cannot be combined with [[junchan]] as there are only six different terminals, but chiitoitsu requires seven distinct pairs. | |||
This yaku forbids kan, so [[rinshan]] is incompatible. [[Chankan]] is also incompatible. A hand in tenpai for chiitoisu always has a copy of the winning tile, thus making it impossible for other players to make the added kan call required for chankan. | |||
=== With iipeikou or ryanpeikou === | |||
A chiitoitsu hand may collect sequential series of paired tiles, which may look like [[iipeikou]] or even [[ryanpeikou]]. Both yaku are incompatible with chiitoisu, as once again, all tiles are considered to be in pairs, not [[mentsu|sequences]]. | |||
==Value== | |||
{{main|Scoring table}} | |||
As a special exception to scoring, this hand is always given 25 [[fu]]. No other fu are awarded: not for yakuhai pairs, [[tanki]] waits, or closed ron. It is not rounded up to 30 fu. This produces a distinct set of scoring values: | |||
{| class="wikitable" width=70% | |||
|- | |||
!width=25%| Position !! 2 han !! 3 han !! 4 han !! 5 han or more | |||
|- | |||
| {{Score cell|tsumo=Non-dealer tsumo|ron=Non-dealer ron}}||align=center|{{Score cell|tsumo=''Not possible''|ron=1600}}||align=center| {{Score cell|tsumo=800/1600|ron=3200}}||align=center|{{Score cell|tsumo=1600/3200|ron=6400}} || rowspan=2 align=center| Mangan, Haneman, etc. | |||
|- | |||
| {{Score cell|tsumo=Dealer tsumo|ron=Dealer ron}}||align=center|{{Score cell|tsumo=''Not possible''|ron=2400}}||align=center|{{Score cell|tsumo=1600|ron=4800}}||align=center|{{Score cell|tsumo=3200|ron=9600}} | |||
|} | |||
A 2 han chiitoitsu tsumo is not possible, as chiitoitsu is always closed, so it also scores [[mentsumo]]. Like all hands, once you reach 5 han or more, fu is no longer relevant for scoring. | |||
Note that, if the hand is below [[mangan]], chiitoitsu can be thought of as a 1 han 50 fu hand. | |||
*2 han 25 fu = 1 han 50 fu | |||
*3 han 25 fu = 2 han 50 fu | |||
*4 han 25 fu = 3 han 50 fu | |||
High scoring chiitoitsu hands are possible even without dora. The highest possible hand is [[riichi]], [[ippatsu]], [[menzenchin tsumohou|tsumo]], [[haitei raoyue and houtei raoyui|haitei]] and [[chinitsu]]. With the 2 han for chiitoitsu, the combination brings the hand to a whopping 12 han. Note that [[tanyao]] cannot be added, as the hand 22334455667788 can be scored as [[ryanpeikou]] for an additional 1 han. In some [[rule variations#Daisharin|rule variations]], this hand is an [[optional yaku|optional yakuman]], known as "daisharin", "daichikurin", or "daisuurin", depending on the suit. | |||
=== With dora === | |||
{{main|Dora}} | |||
All tiles in this yaku must be in pairs. Therefore the dora tiles also tend to occur in pairs. The [[Akadora|red dora]], if used, are exceptions, since they can be paired with non-red versions of the tile. | |||
==External links== | |||
{{jpwiki|七対子}} | |||
[[Category: Yaku]] | |||
{{Navbox yaku}} | |||