Chankan: Difference between revisions

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.