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→Restrictions
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== Restrictions == | == Restrictions == | ||
Some restrictions apply to kan calls | Some restrictions apply to kan calls. The restrictions are based on tile counts and rules pertaining to riichi itself. | ||
===Haiteihai=== | |||
Kan cannot be called after drawing the [[Haiteihai|last tile]], as the live wall is empty and so a tile cannot be moved to the dead wall. Part of the kan process requires live tiles from the end of the wall to be transferred to the dead wall. If this is not possible, then kan is not possible. | |||
===Kan during riichi=== | |||
{{main|Riichi}} | |||
Kan calls after riichi is possible and may be allowed or disallowed depending on the hand's composition. Under all of these cases, the call for a closed kan is used. The other two types of kan calls cannot occur, as riichi requires closed hand. | |||
When a riichi declarer holds three identical tiles and draws the fourth after the riichi announcement, the player may form an [[Kan|ankan]] from these tiles instead of discarding the fourth. The hand composition and the possible winning tiles may not change: it is not allowed to declare kan if, for some possible winning tile, any of the three identical tiles may be interpreted as part of a [[shuntsu|sequence]] or part of the pair. | |||
If a player does declare a kan illegally during riichi, and they call [[ron]] or the game goes to an [[ryuukyoku|exhaustive draw]], then they will be penalized with a [[chombo]] penalty for breaking the rule. If a player is not required to reveal their hand, or if another player wins, they will normally not be penalized. | |||
Of course, a player may outright decline the call for kan and discard the drawn tile. After all, the play invokes a risk pertaining to the kandora. During a riichi call, the player is defenseless against the benefactors of the new dora. | |||
'''Example 1:''' | |||
:{{#mjt:3444m778899s333z}} Illegal kan: {{#mjt:4m}} Legal kan: {{#mjt:3z}}. | |||
It is not allowed to kan the fours. The manzu tiles may either be interpreted as a 3-4 [[Ryanmen|ryanmen]] wait and a 4-4 pair, or as a 4-man ankou with a 3-man [[tanki]] wait. A kan call would alter the wait just for a 3-man tanki. For a legal kan declaration, the three identical tiles would have to be an ankou in any interpretation. Had the player drawn a west wind, he would have been allowed to kan it. | |||
'''Example 2:''' | |||
:{{#mjt:111m222333p5678s}} Legal kan: {{#mjt:1m}} {{#mjt:2p}} or {{#mjt:3p}}. | |||
In this example, none of the waits are affected by any of the kan possibilities. The waiting tiles are completely unrelated to any of the existing triplets in this hand. Therefore, it is acceptable to call kan during riichi here. | |||
'''Example 3:''' | |||
:{{#mjt:3335666p111456s}} Illegal kan: {{#mjt:36p}} | |||
Here, the waits are 457p. A kan on 6p would remove the 7p wait, so it is obviously not permitted. A kan on the 3p would not change the waits, however, if the hand was won with 4p, the hand could be interpreted as: | |||
:{{#mjt:33p}} {{#mjt:345p}} {{#mjt:666p}} {{#mjt:111s}} {{#mjt:456s}} | |||
In this case, the 3p does not form a [[koutsu|triplet]], but rather a pair and a part of a sequence. A kan on the 3p would remove this potential interpretation of the hand, and is therefore forbidden. | |||
===Naki=== | |||
After [[naki|taking a discarded tile]], a player cannot call kan, even if a player has the tile(s) available in hand to do so. The next opportunity to call kan comes after the next tile draw. This does not apply when a daiminkan is called, as the kan causes a tile to be drawn immediately. | |||
===Suukaikan=== | |||
When [[tochuu ryuukyoku|abortive draws]] are used, [[suukaikan|four kan calls]] causes an abortive draw, unless they were all made by the same player. When the same player makes [[Suukantsu|all four calls]], then no more calls for kan can be made until the next hand. | |||
==Suukaikan== | ==Suukaikan== | ||