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[[Image:Dead Wait.png|thumb|right|250px|Example of a karaten riichi, with all waiting tiles circled in red.]]
[[Image:Dead Wait.png|thumb|right|250px|Example of a karaten riichi, with all waiting tiles circled in red.]]
'''Karaten''' {{kana|カラテン}}, or '''empty tenpai''', is a state where a [[tenpai]] hand does not have the ability to win.  This is due to unavailability of all instances of winning tiles.  The "visible tiles" may either be discarded, used as a dora indicator, or already exist in one's hand. Furthermore, they may be held in other player's hands or even reside within the dead wall. However, the latter case is beyond a player's visibility.
[[Image:Keishiki ankan.png|right|thumb|250px|Karaten tenpai acquired [https://mahjongsoul.game.yo-star.com/?paipu=190508-4ebd32bc-71a5-4f4f-86a7-16066dfdc896_a925124703 after calling kan].]]
[[Image:Karatenpon.png|right|thumb|250px|Karaten situation, where the winning tiles to a [[hadaka tanki]] were called for pon earlier.]]
'''Karaten''' {{kana|カラテン}}, or '''empty tenpai''', is a [[tenpai]] hand that cannot win because all possible winning tiles are unavailable.  The "visible tiles" may either be discarded, used as a dora indicator, and/or already exist in one's hand. In addition the tiles may be held in other players' hands or in the dead wall, but these would be unknown to the player.
 
Karaten hands are generally considered tenpai for the purpose of [[ryuukyoku]], except if all four copies of the winning tile are in the player's own hand.
 
==The fifth tile case==
When a hand has all four copies of a tile, and is waiting on a fifth copy of a tile, it may not considered tenpai at all. Example:


==Ambiguity==
{{#mjt: 123456789m5555p}} Waiting for: {{#mjt: 5p}} (impossible)
[[Image:Keishiki ankan.png|right|thumb|250px|Karaten tenpai acquired [https://mahjongsoul.game.yo-star.com/?paipu=190508-4ebd32bc-71a5-4f4f-86a7-16066dfdc896_a925124703 after calling kan].]]
 
The term is often confused with the "fifth tile" case.  Here, a hand waiting for a fourth tile that is simply hidden, discarded, or used by someone else remains a valid tenpai in all circumstances. A hand may contain a 1-2 [[Penchan|penchan]] and a previously declared [[Kan|kan]] of 3-3-3-3 in the same suit.  This renders the threes unavailable as winning tiles. It would be announced what qualifies as tenpai or not. As a precaution, it is almost always mentioned.
If this hand could obtain a fifth 5-pin, it could win by completing a triplet and pair.


'''Example:'''<br>
{{#mjt:12m444p678s1180z33m0z}}  Waiting for: {{#mjt:3m}}
{{#mjt:12m444p678s1180z33m0z}}  Waiting for: {{#mjt:3m}}


===Quirks===
Similarly, this hand could complete a sequence if there was a fifth 3-pin, but all four are part of a [[kan]].
* On Ron2, there has been an instance of a person being able to call riichi with a gutshot wait shape for a 6-pin when they have made a closed kan of 6-pin already. The hand was considered noten, but did not trigger a chombo penalty (mainly due to programming assuming no one could do something that could be viewed as faulty). This conforms to the usual '''keishiki tenpai''' interpretation that the hand was not in a valid tenpai shape when it came to scoring a drawn hand, but not okay for determining if a player was legally allowed to declare [[riichi]].
 
* On Tenhou, there have been reports of a hand containing 12s44466688p with a kan of 3s, scored as in tenpai. This does not conform to the usual '''keishiki tenpai standard'''. All hands that conform to '''keishiki tenpai''' are valid, as well as a few (such as the current case) that may not be.
This is subject to rule variation. In some platforms, hands like these still count towards tenpai.
 
===Cases===
* On Ron2, there has been an instance of a person being able to call riichi with a gutshot wait shape for a 6-pin when they have made a closed kan of 6-pin already. The hand was considered noten, but did not trigger a chombo penalty (mainly due to programming assuming no one could do something that could be viewed as faulty). The hand was not in a valid tenpai shape when it came to scoring a drawn hand, but not okay for determining if a player was legally allowed to declare [[riichi]].
* On Tenhou, there have been reports of a hand containing 12s44466688p with a kan of 3s, scored as in tenpai.  
* Likewise, the same kind of case is allowable in [[Mahjong Soul]].


==External links==
==External links==
[[Category:Terminology]]
[[Category:Terminology]]

Latest revision as of 20:52, 22 March 2024

Example of a karaten riichi, with all waiting tiles circled in red.
Karaten tenpai acquired after calling kan.
Karaten situation, where the winning tiles to a hadaka tanki were called for pon earlier.

Karaten 「カラテン」, or empty tenpai, is a tenpai hand that cannot win because all possible winning tiles are unavailable. The "visible tiles" may either be discarded, used as a dora indicator, and/or already exist in one's hand. In addition the tiles may be held in other players' hands or in the dead wall, but these would be unknown to the player.

Karaten hands are generally considered tenpai for the purpose of ryuukyoku, except if all four copies of the winning tile are in the player's own hand.

The fifth tile case

When a hand has all four copies of a tile, and is waiting on a fifth copy of a tile, it may not considered tenpai at all. Example:

Waiting for: (impossible)

If this hand could obtain a fifth 5-pin, it could win by completing a triplet and pair.

Waiting for:

Similarly, this hand could complete a sequence if there was a fifth 3-pin, but all four are part of a kan.

This is subject to rule variation. In some platforms, hands like these still count towards tenpai.

Cases

  • On Ron2, there has been an instance of a person being able to call riichi with a gutshot wait shape for a 6-pin when they have made a closed kan of 6-pin already. The hand was considered noten, but did not trigger a chombo penalty (mainly due to programming assuming no one could do something that could be viewed as faulty). The hand was not in a valid tenpai shape when it came to scoring a drawn hand, but not okay for determining if a player was legally allowed to declare riichi.
  • On Tenhou, there have been reports of a hand containing 12s44466688p with a kan of 3s, scored as in tenpai.
  • Likewise, the same kind of case is allowable in Mahjong Soul.

External links