Chankan: Difference between revisions

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→‎Development: "never" is wrong b/c kokushi ankan
m (→‎Development: "never" is wrong b/c kokushi ankan)
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==Development==
==Development==
[[image:Chankan.png|250px|thumb|[http://tenhou.net/0/?log=2012112813gm-0009-7447-af4e435f&tw=2&ts=8 Chankan example], where the player declared ron on 1-pin and all four are shown as a kan.]]
[[image:Chankan.png|250px|thumb|[http://tenhou.net/0/?log=2012112813gm-0009-7447-af4e435f&tw=2&ts=8 Chankan example], where the player declared ron on 1-pin and all four are shown as a kan.]]
Known in English as "robbing a kan", chankan occurs when a player is in [[tenpai]] for a tile used to upgrade a [[pon]] into an added [[kan]]. Any tenpai hand works for chankan, even if the hand is otherwise yakuless. The other two types of kan can never be used for this yaku.
Known in English as "robbing a kan", chankan occurs when a player is in [[tenpai]] for a tile used to upgrade a [[pon]] into an added [[kan]]. Any tenpai hand works for chankan, even if the hand is otherwise yakuless. The other two types of kan cannot normally be used for this yaku.


*In almost all cases, players cannot ron off an [[ankan]] (closed kan). The notable exception is with a [[kokushi]] [[tenpai]] hand. For kokushi, the last tile needed for the yakuman may be won from an opponent's ankan. However, in [[Rule_variations#Kokushi_and_chankan|some rules]], kokushi cannot win in this way.
*In almost all cases, players cannot ron off an [[ankan]] (closed kan). The notable exception is with a [[kokushi]] [[tenpai]] hand. For kokushi, the last tile needed for the yakuman may be won from an opponent's ankan. However, in [[Rule_variations#Kokushi_and_chankan|some rules]], kokushi cannot win in this way.
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