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Chankan: Difference between revisions
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As defined, chankan can only be achieved when a [[minkou]] (open triplet) is upgraded to a ''shouminkan''. In other words, a player had called pon earlier and then drew the 4th tile, for the kan. If another player is tenpai for that tile, then the player may declare ron. To some degree, the added kan may be viewed as a discard in this case. | As defined, chankan can only be achieved when a [[minkou]] (open triplet) is upgraded to a ''shouminkan''. In other words, a player had called pon earlier and then drew the 4th tile, for the kan. If another player is tenpai for that tile, then the player may declare ron. To some degree, the added kan may be viewed as a discard in this case. | ||
So, when it comes to [[machi]] (wait patterns), only three basic types can be used for chankan: [[penchan]], [[kanchan]], and [[ryanmen]]. To achieve chankan, all four copies of a tile would've needed to been in another player's hand. Therefore, a hand winning with chankan must not have any copies of that tile. This forbids tile patterns involving [[ | So, when it comes to [[machi]] (wait patterns), only three basic types can be used for chankan: [[penchan]], [[kanchan]], and [[ryanmen]]. To achieve chankan, all four copies of a tile would've needed to been in another player's hand. Therefore, a hand winning with chankan must not have any copies of that tile. This forbids tile patterns involving [[shanpon]] and [[tanki]], as both types of wait require at least one copy of that tile. | ||
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. An exception to kan calls involving [[ankan]] (closed kan) is made. | 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. An exception to kan calls involving [[ankan]] (closed kan) is made. | ||
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{{Yaku compatibility table|CHK}} | {{Yaku compatibility table|CHK}} | ||
Excluding kokushi musou, chankan requires at least one sequence in the hand, because waits to complete a pair (tanki) or triplet ( | Excluding kokushi musou, chankan requires at least one sequence in the hand, because waits to complete a pair (tanki) or triplet (shanpon) would be impossible. This excludes [[toitoi]], [[chiitoitsu]], and [[honroutou]]. [[Ryanpeikou]] is also not allowed, due to the tile requirement. A ryanpeikou tenpai requires at least one copy of the winning tile, and in order for an opponent to call kan in the first place, you must have no copies of said winning tile. | ||
As for [[rinshan]], [[haitei]], [[houtei]], and [[mentsumo]], it is physicially impossible to combine any of these four with chankan. In the case for rinshan, the possibility to combine with chankan is outright impossible, as rinshan is defined by winning from the dead wall tile draw. In the case of haitei and houtei, a player cannot call kan, when the dead wall cannot be maintained at 14-tiles. This case occurs, at the last allowable tile draw of the hand. | As for [[rinshan]], [[haitei]], [[houtei]], and [[mentsumo]], it is physicially impossible to combine any of these four with chankan. In the case for rinshan, the possibility to combine with chankan is outright impossible, as rinshan is defined by winning from the dead wall tile draw. In the case of haitei and houtei, a player cannot call kan, when the dead wall cannot be maintained at 14-tiles. This case occurs, at the last allowable tile draw of the hand. | ||