Ittsuu vs sanshoku: Difference between revisions

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Ittsuu vs sanshoku (view source)

Revision as of 06:48, 23 September 2024

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[[Image:Ittsusanshoku1.png|right|thumb|250px|Hand state, where viability of [http://tenhou.net/0/?log=2018102617gm-0029-0000-682f0833&tw=2&ts=5 either yaku is available].]]
[[Image:Ittsusanshoku1.png|right|thumb|250px|Hand state, where viability of [http://tenhou.net/0/?log=2018102617gm-0029-0000-682f0833&tw=2&ts=5 either yaku is available].]]
[[Image:Ittsusanshoku2.png|right|thumb|250px|A [https://mahjongsoul.game.yo-star.com/?paipu=190610-88da9112-5408-42a0-9e91-981865cbf401_a925632600 choice given] between two forms of sanshoku (123 or 234) and ittsuu.]]
[[Image:Ittsusanshoku2.png|right|thumb|250px|A [https://mahjongsoul.game.yo-star.com/?paipu=190610-88da9112-5408-42a0-9e91-981865cbf401_a925632600 choice given] between two forms of sanshoku (123 or 234) and ittsuu.]]
The two yaku [[ittsuu]] and [[sanshoku]] are not compatible, because the hand does not have enough [[Mentsu|tile groupings]] to accommodate both yaku.  In turn, this forces players to choose one over the other in the event both are viable during the course of a hand.


== Value ==
[[Ittsuu]] and [[sanshoku doujun]] are similar but incompatible [[yaku]], because hand does not have enough [[mentsu|space]] for both yaku. When a hand has the potential to score one or the other, a player must choose which to aim for.
When closed or open, both produce the same amount of han: one while open, or two while closed.  Therefore, the value question is somewhat irrelevant.  The balance then stems on the other [[Yaku compatibility|yaku combinations]].  In the case of [[tanyao]], then sanshoku may be favored as ittsuu utilizes [[routouhai|terminals]].


== Frequency difference ==
==Formation==
According to monthly data in [[Tenhou.net]], sanshoku occurs a little more than double than ittsuu. This is due to the wider number range across the three suits rather than depending on an entire 1-9 sequence of one suit.
Ittsuu and sanshoku require 3 specific sequences. They are both worth 2 han closed, and 1 han open.
 
However, according to monthly data in [[Tenhou.net]], sanshoku is around twice as frequent as ittsu. This is due to a few reasons:
*It is easier to make a 345 sequence than a 123 sequence. To make 345, a player can have {34, 35, 45} in hand. To make 123, a player can only have {12, 23} in hand.
*Players prefer middle tiles over terminals for [[tile efficiency]] reasons. This means they are more likely to have a 34 or 45 [[ryanmen]] than a 12 [[penchan]] or 23 ryanmen. Thus, it is easier to "incedentially" form sanshoku than it is
 
Also, sanshoku is compatible with [[tanyao]] and [[chanta]]/[[junchan]], while ittsu is compatible with [[honitsu]]/[[chinitsu]].


== External links ==
== External links ==
[[Category:Yaku]]
[[Category:Yaku]]
[[Category:Strategy]]
[[Category:Strategy]]
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