Kanchan: Difference between revisions

From Japanese Mahjong Wiki
Jump to navigation Jump to search
No edit summary
(reorganize)
Line 19: Line 19:
Kanchan is awarded 2 fu upon winning.  A closed hand winning by ron automatically becomes [[mangan]], if it scores 4 han.
Kanchan is awarded 2 fu upon winning.  A closed hand winning by ron automatically becomes [[mangan]], if it scores 4 han.


==Ryankan==
==Strategy==
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:
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.


{| class="wikitable"
In general, ''inner'' kanchans > ''outer'' kanchans > [[penchan]]s when it comes to [[tile efficiency]]. See below for details.
!Examples
| 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 the three tiles, turning it back into a weak kanchan shape.
 
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 kanchan wait is always a [[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.
 
==Strategy==
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.


===Kanchan vs Penchan===
===Kanchan vs Penchan===
Line 50: Line 31:
*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.
*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, giving another advantage to kanchan. However, once you reach tenpai, both kanchan and penchan become effectively identical.
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===
===Inner vs Outer Kanchan===
Line 65: Line 46:
|}
|}


Inner kanchans are generally superior to outer kanchans because they are easier to upgrade. This is similar to how (all) kanchans are better than penchans, as kanchans are easier to upgrade.
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: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}}.
Line 72: Line 53:


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.
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==

Revision as of 01:06, 12 June 2024

Kanchan
Kanji 嵌張
English Closed wait, Middle wait
Fu 2 fu
Tile types waiting 1 sided wait
Tiles available 4 tiles
Pattern example
Tenhou.net example Kanchan

Kanchan 「嵌張」 is a wait pattern that completes with the middle number of a sequence.

Pattern

Fu

Kanchan is awarded 2 fu upon winning. A closed hand winning by ron automatically becomes mangan, if it scores 4 han.

Strategy

Kanchan is considered to be a "bad wait", because it can only wait for a maximum of 4 tiles. Thus, they are worse for hand development. Like the other bad waits, kanchan can be used to suji trap opponents.

In general, inner kanchans > outer kanchans > penchans 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 kanchan can be upgraded by drawing , turning it into a (two-sided) ryanmen.
  • A penchan cannot be upgraded to ryanmen on its own. It must first draw a , turning it into a kanchan, then draw the 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 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.

Type Tiles
Inner
Outer

Inner kanchans are generally superior to outer kanchans because they are easier to upgrade, similar to how (all) kanchans are better than penchans.

  • A kanchan can be upgraded by drawing (turning into ) OR (turning into ). It can also be turned into a ryankan when drawing either or .
  • A kanchan can only be upgraded by drawing . It can be turned into a ryankan when drawing 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:

Pattern
Tiles to complete

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:

With the example hand above, if you drew , you would have to discard either or to enter tenpai. You end up with a bad wait, but with one major advantage - a ryankan always forms a 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