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Chankan: Difference between revisions
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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 | 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. | ||
*It is impossible to ron off an [[Kan#Daiminkan| | *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). | 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). | ||
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So, when it comes to [[machi]] (wait patterns), only three basic types can be used: [[penchan]], [[kanchan]], and [[ryanmen]]. These are all waits to complete a [[shuntsu|sequence]]. | So, when it comes to [[machi]] (wait patterns), only three basic types can be used: [[penchan]], [[kanchan]], and [[ryanmen]]. These are all waits to complete a [[shuntsu|sequence]]. | ||
In the case for [[kokushi musou]], the hand is tenpai for kokushi with one of the 13-tile types already paired, and it is waiting for the last tile type for completion. Depending on the rules, | In the case for [[kokushi musou]], the hand is tenpai for kokushi with one of the 13-tile types already paired, and it is waiting for the last tile type for completion. Depending on the rules, kokushi may or may not be allowed to win from a closed kan. | ||
===Furiten=== | ===Furiten=== | ||