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Kanchan: Difference between revisions
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==Strategy== | ==Strategy== | ||
Kanchan is | Kanchan is considered to be a "bad wait", because it can only wait for a maximum of 4 tiles. Thus, they are worse for [[tile efficiency|hand development]]. Like the other bad waits, kanchan can be used to [[Suji#Offense|suji trap]] opponents. | ||
In general, ''inner'' kanchans > ''outer'' kanchans > [[penchan]]s when it comes to [[tile efficiency]]. See below for details. | |||
===Kanchan vs Penchan=== | |||
While kanchan and [[penchan]] wait on the same number of tiles, a kanchan is considered better to keep. This is because kanchans are easier to upgrade. | |||
*A {{#mjt:24p}} kanchan can be upgraded by drawing {{#mjt:5p}}, turning it into a {{#mjt:45p}} (two-sided) [[ryanmen]]. | |||
*A {{#mjt:12p}} penchan cannot be upgraded to ryanmen on its own. It must first draw a {{#mjt:4p}}, turning it into a {{#mjt:24p}} kanchan, then draw the {{#mjt:5p}} to get a ryanmen. | |||
As a kanchan requires 1 tile to be upgraded to a ryanmen, but a penchan requires 2 tiles, the kanchan is superior to keep before tenpai. In addition, only a kanchan can be turned into a [[#Ryankan|ryankan]] shape (see below section), giving another advantage to kanchan. However, once you reach tenpai, both kanchan and penchan become effectively identical. | |||
===Inner vs Outer Kanchan=== | |||
There are two different types of kanchan: inner and outer. | |||
{| class=wikitable | |||
! Type !! colspan=4| Tiles | |||
|- | |||
!Inner | |||
|{{#mjt:35p}} || {{#mjt:46p}} || {{#mjt:57p}} || | |||
|- | |||
!Outer | |||
|{{#mjt:13p}} || {{#mjt:24p}} || {{#mjt:68p}} || {{#mjt:79p}} | |||
|} | |||
Inner kanchans are generally superior to outer kanchans because they are easier to upgrade, similar to how (all) kanchans are better than penchans. | |||
*A {{#mjt:35p}} kanchan can be upgraded by drawing {{#mjt:2p}} (turning into {{#mjt:23p}}) OR {{#mjt:6p}} (turning into {{#mjt:56p}}). It can also be turned into a [[#Ryankan|ryankan]] when drawing either {{#mjt:1p}} or {{#mjt:7p}}. | |||
*A {{#mjt:24p}} kanchan can only be upgraded by drawing {{#mjt:5p}}. It can be turned into a ryankan when drawing {{#mjt:6p}} only. | |||
Note that an inner kanchan waits on a middle tile. Middle tiles are harder to win with, so there's some downside to using them. | |||
==Ryankan== | |||
A '''ryankan''' is an extended form of a kanchan, only available before reaching tenpai. A ryankan shape is composed of three tiles that are each 2 apart, such as: | |||
{| class="wikitable" | |||
!Pattern | |||
| align=center| {{#mjt:246p}} || align=center| {{#mjt:357p}} || align=center| {{#mjt:468p}} | |||
|- | |||
!Tiles to complete | |||
|align=center| {{#mjt:35p}} || align=center| {{#mjt:46p}} || align=center| {{#mjt:57p}} | |||
|} | |||
A ryankan is effectively the same as having 2 different kanchan waits; it waits for 8 tiles of two types (4 tiles per type). | |||
However, you cannot enter tenpai with a ryankan. If you would reach tenpai without completing the ryankan, you'd have to discard one of its three tiles, turning it back into a weak kanchan wait. | |||
Example hand with ryankan shape: | |||
{{#mjt:12344m23789p246s}} | |||
With the example hand above, if you drew {{#mjt:1p}}, you would have to discard either {{#mjt:2s}} or {{#mjt:6s}} to enter tenpai. You end up with a bad wait, but with one major advantage - a ryankan always forms a [[Suji#Offense|suji trap]]. Here, if you discarded the 6s, you would wait on the suji 3s, thus making it more likely for others to deal in. This is why a suji of the [[riichi]] declaration tile is considered more dangerous. | |||
==External links== | ==External links== | ||