Daburu riichi: Difference between revisions

Daburu riichi
Type	Yaku
Kanji	両立直 or ダブルリーチ
English	Double ready
Value	2 han
Speed	Immediate
Difficulty	At discretion

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Revision as of 01:53, 20 March 2024

Daburu riichi 「両立直」 or 「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 tile call, then riichi will automatically be converted into double riichi. Double riichi is worth 2 han instead of the usual 1 han.

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.

Cancellation

Double riichi is not possible when anyone makes a tile call before the riichi call, even if you reach tenpai on your first turn. Therefore, a player's own kan will deny this yaku. In sanma, kita calls will also deny this yaku.

Tenhou and Chihou

Main article: Tenhou and chiihou

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 or 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.

Defending against double riichi

Double riichi's greatest advantage, aside from its speed, is the lack of information regarding safe tiles. Initially, every tile is considered to be dangerous, as no to few discarded tiles show any indication of safe tiles.

If you have nothing better, then honor tiles are the best to discard. Honor tiles cannot form sequences, so they are the least likely to be waited for. Guest winds are better than yakuhai as they do not give an extra han.

After a few discards, you can benefit from the furiten rule. When a player is in riichi, any discarded tile not claimed for a win is safe against that riichi. Therefore, safe tiles will rack up quickly.

The threat of double riichi can also be ended via abortive draw. Kyuushu kyuuhai can immediately end the hand before the declarer can claim tsumo, as can suufon renta.

External links

ダブル立直

Daburu riichi in Japanese Wikipedia

@@ Line 24: / Line 24: @@
 == Defending against double riichi ==
 [[Image:Double riichi denied.png|thumb|right|250px|[http://tenhou.net/0/?log=2016032809gm-0089-0000-19c59dbd&tw=1&ts=7 Double riichi] stopped by [[kyuushu kyuuhai]].]]
-Double riichi's greatest advantage, aside from its speed, is the lack of information regarding [[safe tiles]] at the beginning of the hand.  Initially, every tile is considered to be dangerous, as no to few discarded tiles show any indication of safe tiles.
+Double riichi's greatest advantage, aside from its speed, is the lack of information regarding [[safe tiles]].  Initially, every tile is considered to be dangerous, as no to few discarded tiles show any indication of safe tiles.
-However, this advantage can be worn away through the [[furiten]] rule. While a player in riichi, every tile not claimed for a win is considered safe against the riichi caller. If a winning tile does not come soon enough, the other players may themselves reach tenpai. If affordable, a player may employ [[sashikomi]], in the hope of dealing into a cheaper hand.
+If you have nothing better, then [[honor tile]]s are the best to discard. Honor tiles cannot form sequences, so they are the least likely to be waited for. Guest winds are better than yakuhai as they do not give an extra han.
-For more unusual situations, the threat of a double riichi can be averted by ending the hand via [[Tochuu ryuukyoku|abortive draw]].  [[Kyuushu kyuuhai]] can immediately end the hand before the declarer can claim tsumo.  An even more unusual possibility can end with suufon renta.  Eventual means can be provided by [[sanchahou]], [[suu kaikan]], or even a risky [[suucha riichi]].
+After a few discards, you can benefit from the [[furiten]] rule. When a player is in riichi, any discarded tile not claimed for a win is safe against that riichi. Therefore, safe tiles will rack up quickly.
+The threat of double riichi can also be ended via  [[Tochuu ryuukyoku|abortive draw]]. [[Kyuushu kyuuhai]] can immediately end the hand before the declarer can claim tsumo, as can suufon renta.
 == External links ==