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Chankan: Difference between revisions
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[[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.]] | ||
With one exception, 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. | * 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. | * 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 | Only shouminkans are vulnerable to chankan (again with one exception). | ||
* | *[[Ankan]] (closed kan) cannot be ronned, ''except'' if a hand has [[kokushi]]. A kokushi hand in tenpai may call ron on an ankan. Not all rulesets enable this "kokushi chankan on a closed kan" rule, though. | ||
*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. | ||