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* [http://tenhou.net/0/?log=2015032605gm-0089-0000-70f97ed2&tw=0 Chankan baiman]
* [http://tenhou.net/0/?log=2015032605gm-0089-0000-70f97ed2&tw=0 Chankan baiman]
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'''Chankan''' {{kana|搶槓}} is a standard yaku dependent on an opponent's [[kan]]. When an opponent calls to upgrade a [[koutsu|minkou]] (triple called via [[pon]]) to a [[Kan#Shominkan|shominkan]] (added kan), a player in tenpai for that tile may call ron, gaining the yaku of chankan.
'''Chankan''' {{kana|搶槓}} is a [[yaku]] scored when "robbing a kan". When an opponent upgrades an [[minkou|open triplet]] into an [[Kan#Shominkan|added kan]], you may call [[ron]] if the kan would be your winning tile, scoring chankan in the process.
 
 


==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 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 order for chankan to occur:
* You must be in [[tenpai]], waiting on a tile an opponent already called [[pon]] for. Any tenpai hand can win with chankan, even if the hand would be "yakuless" otherwise.
* The opponent must draw the 4th copy of the ponned tile, then declare a shouminkan (added kan) with it.
 
Only shouminkans are vulnerable to chankan, with one exception:
*In almost all cases, players cannot ron off an [[ankan]] (closed kan). The 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.
*It is impossible to ron off an [[Kan#Daiminkan|daiminkan]] (open kan). When a tile is discarded, it can either be used for ron, or it can be used to complete the kan. Ron takes precedence over kan, so the player wins before the kan is made. If the ron call is skipped, you cannot retroactively ron after the kan is made.
*It is impossible to ron off an [[Kan#Daiminkan|daiminkan]] (open kan). When a tile is discarded, it can either be used for ron, or it can be used to complete the kan. Ron takes precedence over kan, so the player wins before the kan is made. If the ron call is skipped, you cannot retroactively ron after the kan is made.


In other words, an opponent must call [[pon]] before your hand wins, then draw the fourth copy of that tile, then call the added kan. An opponent must have all four copies of a tile in their hand to call added kan. Therefore, chankan becomes impossible if you are holding any copy of that tile (because then the opponent cannot gain that tile for their kan).
Because the opponent must have had possession of all 4 copies of the winning tile, it is impossible for you to have another copy of that tile.


Chankan interrupts the call for kan before it starts. This means that [[kandora]] are not revealed after chankan, and chankan denies the opponent's [[rinshan]] draw.
Chankan interrupts the call for kan before it starts. This means that [[kandora]] are not revealed after chankan, and chankan denies the opponent's [[rinshan]] draw.
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