Kanchan: Difference between revisions

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A ryankan is effectively the same as having 2 different kanchans; it waits for 8 tiles of two types (4 tiles per type).
A ryankan is effectively the same as having 2 different kanchans; 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.
However, a hand cannot enter tenpai with a ryankan. If it would reach tenpai without completing the ryankan, one of its three tiles would need to be discarded, turning it back into a weak kanchan wait.


Example hand with ryankan shape:
Example hand with ryankan shape:
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{{#mjt:12344m23789p246s}}
{{#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 significant 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.
With the example hand above, after drawing {{#mjt:1p}}, either {{#mjt:2s}} or {{#mjt:6s}} would to need to be discarded to enter tenpai. The hand ends up with a bad wait, but with one significant advantage - a ryankan always forms a [[Suji#Offense|suji trap]]. Here, if 6s was discarded, the hand waits 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.


===Inner vs Outer Kanchan===
===Inner vs Outer Kanchan===
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*A {{#mjt:24p}} kanchan can only be upgraded by drawing {{#mjt:5p}} (turning into {{#mjt:45p}}). It can be turned into a ryankan when drawing {{#mjt:6p}} only.
*A {{#mjt:24p}} kanchan can only be upgraded by drawing {{#mjt:5p}} (turning into {{#mjt:45p}}). It can be turned into a ryankan when drawing {{#mjt:6p}} only.


An inner kanchan can be upgraded by twice the amount of tiles, so inner kanchans are overall stronger. Note, though, that an inner kanchan waits on a middle tile. As middle tiles are harder to win with, an inner kanchan is worse to keep at [[tenpai]] than an outer one.
An inner kanchan can be upgraded with twice the amount of tiles, so inner kanchans are overall stronger. Note, though, that an inner kanchan waits on a middle tile. As middle tiles are harder to win with, an inner kanchan is worse to keep at [[tenpai]] than an outer one.


===Kanchan vs Penchan===
===Kanchan vs Penchan===
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*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 drawn tile to be upgraded to a ryanmen, but a penchan requires 2 drawn tiles, the kanchan is superior to keep before tenpai. In addition, only a kanchan can be turned into a [[#Ryankan|ryankan]] shape, adding another advantage. However, once you reach tenpai, both kanchan and penchan become effectively identical.
As a kanchan requires 1 drawn tile to be upgraded to a ryanmen, but a penchan requires 2 drawn tiles, the kanchan is superior to keep before tenpai. In addition, only a kanchan can be turned into a [[#Ryankan|ryankan]] shape, adding another advantage. However, once in tenpai, both kanchan and penchan become effectively identical.


==External links==
==External links==
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