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Riichi: Difference between revisions
No tile call can be made before double riichi (barring house rules). Therefore, double riichi + chankan is not possible, unless it is also kokushi.
JustKidding (talk | contribs) (→Kan) |
(No tile call can be made before double riichi (barring house rules). Therefore, double riichi + chankan is not possible, unless it is also kokushi.) |
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{{main|Double riichi}} | {{main|Double riichi}} | ||
'''Double riichi''' {{kana|ダブルリーチ}} is a special case for riichi. Here, the player declares riichi on the first turn before one's own discard. No tile call may have | '''Double riichi''' {{kana|ダブルリーチ}} is a special case for riichi. Here, the player declares riichi on the first turn before one's own discard. No tile call may have been made before the riichi declaration (including the player's own [[kan]] calls). As the name implies, this yaku is worth 2 han instead of 1 han, as a bonus for the initial timing. With the added han value, a call for double riichi has a huge advantage over the other players in conjunction with the immediate speed and value compared to conventional riichi calls. | ||
== Compatibility == | == Compatibility == | ||
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Once again, the prospect for [[rinshan kaihou]] to work with riichi is dependent on the legality of the [[Riichi#Kan_during_riichi|kan call during riichi]]. With computer interfaces, this rule may be enforced by disabling a player's ability to call the kan during this situation. However, with actual tiles, a player must be aware of this legality. Otherwise, chombo may be enforced instead. | Once again, the prospect for [[rinshan kaihou]] to work with riichi is dependent on the legality of the [[Riichi#Kan_during_riichi|kan call during riichi]]. With computer interfaces, this rule may be enforced by disabling a player's ability to call the kan during this situation. However, with actual tiles, a player must be aware of this legality. Otherwise, chombo may be enforced instead. | ||
=== Double riichi + chankan === | |||
Double riichi has the same compatibility as riichi except for [[chankan]]. This is because, for a regular hand, chankan may only be formed from an [[Kan#Shouminkan|added kan]], which itself requires a call for [[pon]] to happen first. | |||
* If the pon call happens before the riichi call, then double riichi is negated. | |||
* If the pon call happens after the riichi call, then the double riichi player must have declined their winning tile, invoking [[furiten]]. Chankan can only be won from [[ron]], so furiten prevents chankan entirely. | |||
An exception is the yakuman [[kokushi musou]]. Depending on [[rule variations|rule variation]], kokushi may be won off an [[ankan]], which does not require a previous pon call. Therefore, in order to win with double riichi + chankan, it must be also have kokushi. Since it is a yakuman hand, the yaku of "chankan" is never actually scored. | |||
== Strategy == | == Strategy == | ||
{{main|Riichi strategy}} | {{main|Riichi strategy}} | ||
Calling riichi is an optional play. Therefore, players often have to make various considerations | Calling riichi is an optional play. Therefore, players often have to make various considerations when it comes to using riichi. Often, this will depend on the discarded tiles, how early or late in the hand, the hand value, and/or the player's hand composition. If possible, a player may opt not to use riichi at all and instead employ the strategy of [[damaten]]. | ||
==External links== | ==External links== | ||