Daburu riichi: Difference between revisions
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'''Daburu riichi''' {{kana|両立直}} or {{kana|ダブルリーチ}}, or simply '''double riichi''', is a special case for [[riichi]] on the first turn. Specifically, if the player reaches [[tenpai]] before their first discard (i.e., within the first 14 tiles), and before anyone has made a [[Naki|tile call]], then riichi will automatically be converted into double riichi. Double riichi is worth 2 han instead of the usual 1 han (i.e., +1 han compared to riichi). | '''Daburu riichi''' {{kana|両立直}} or {{kana|ダブルリーチ}}, or simply '''double riichi''', is a special case for [[riichi]] on the first turn. Specifically, if the player reaches [[tenpai]] before their first discard (i.e., within the first 14 tiles), and before anyone has made a [[Naki|tile call]], then riichi will automatically be converted into double riichi. Double riichi is worth 2 han instead of the usual 1 han (i.e., +1 han compared to riichi). | ||
As with regular riichi, double riichi is not mandatory, but rarely do players decline an opportunity for it. In addition to the added han, a double riichi hand is much faster than the average hand. | As with regular riichi, double riichi is not mandatory, but rarely do players decline an opportunity for it. In addition to the added han, a double riichi hand is inherently much faster than the average hand. | ||
== Cancellation == | == Cancellation == | ||
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It is very much possible to call a double riichi and be in [[furiten]] from the beginning. This can only be done with a hand qualifying for either [[Tenhou and chiihou|tenhou]] or [[Tenhou and chiihou|chiihou]]. However, this is a dubious play, either intentionally or unintentionally passing up [[yakuman]]. For this reason, it is unwise to be hasty about the prospect of a double riichi. | It is very much possible to call a double riichi and be in [[furiten]] from the beginning. This can only be done with a hand qualifying for either [[Tenhou and chiihou|tenhou]] or [[Tenhou and chiihou|chiihou]]. However, this is a dubious play, either intentionally or unintentionally passing up [[yakuman]]. For this reason, it is unwise to be hasty about the prospect of a double riichi. | ||
== Compatibility == | |||
{{main|Yaku compatibility}} | |||
{{Yaku compatibility table|RCH,DRI}} | |||
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 [[Kokushi_musou#Chankan_rule_variation|rule variation]], kokushi may be won off a [[ankan|closed kan]], which does not require a previous pon call. Therefore, in order to win with double riichi + chankan, it must also have kokushi. Since this would be a yakuman hand, the yaku of "chankan" is never actually scored. | |||
== Defending against double riichi == | == Defending against double riichi == | ||