Chankan: Difference between revisions

Chankan (view source)

2 bytes added , 15 March

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"a hand winning... must have no copies of that tile" doesn't make sense

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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.
-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.
+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 have needed to been in another player's hand. Therefore, a hand winning with chankan must not have any other copies of the winning tile. This forbids tile patterns involving [[shanpon]] and [[tanki]], as these waits require another copy of the 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.