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 06:13, 17 March 2024

Daburu riichi 「両立直」 or 「ダブルリーチ」, is simply double riichi. It 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 turns into double riichi. Double riichi is worth 2 han instead of the usual 1 han.

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 you, even if you have tenpai on the first turn. 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 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.

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.

For more unusual situations, the threat of a double riichi can be averted by ending the hand via 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.

External links

ダブル立直

Daburu riichi in Japanese Wikipedia

@@ Line 10: / Line 10: @@
 * [http://tenhou.net/0/?log=2016072423gm-00a9-0000-b0aed9e0&ts=8&tw=2 Double riichi denied]
 }}
-'''Daburu riichi''' {{kana|両立直}} or {{kana|ダブルリーチ}}, is simply '''double riichi'''.  This is a special case for [[riichi]].  In this case, the player's [[haipai|start hand]] is already at tenpai from the [[Haipai|dealt tiles]], or the initial draw produces a tenpai hand.  Effectively, this is the fastest possible tenpai hand.  Naturally, a player has the option to declare riichi at this time.  Rarely does a player decline such a call, but it does happen.  No tile call may interrupt the turn order before the declaration, where applicable.  For the dealer, the only possible interruption would be a call for a closed [[kan]].
+'''Daburu riichi''' {{kana|両立直}} or {{kana|ダブルリーチ}}, is simply '''double riichi'''.  It 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 turns into double riichi. Double riichi is worth 2 han instead of the usual 1 han.
-Double riichi is worth 2 han instead of 1 han for a normal riichi, 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 of the hand.  Of course, that advantage withers away with each unsuccessful draw, especially when the number of safe discards increases as the collective draws and discards progresses.
+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 you, even if you have tenpai on the first turn. A player's own [[kan]] will deny this yaku. In [[sanma]], [[kita]] calls will also deny this yaku.
 == Tenhou and Chihou ==
@@ Line 21: / 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.  However, this advantage can be worn away as every non-winning tile becomes a safe tile upon discard.  Per the [[Furiten|furiten rule]], every tile not claimed for a win after the riichi call is considered to be a safe tile - against the riichi caller.  If a winning tile does not come soon enough, then other players may actually attain tenpai in their own right and may leave the initial riichi declarer to be vulnerable.  If affordable, a player may employ [[sashikomi]], in the hope of dealing into a cheaper hand.
+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.
+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.
 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]].