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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Latest revision as of 14:33, 21 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 (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.

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, kan, even the player's own closed 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. Since honor tiles cannot form sequences, they are the least likely to be a winning tile. 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. Eventually, players may reach tenpai and win for themselve.s

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. The other types of draw (suukaikan, suucha riichi, sanchahou) are usually too dangerous to rely on, but they can get you out of the hand.

External links

ダブル立直

Daburu riichi in Japanese Wikipedia

@@ Line 1: / Line 1: @@
 {{Infobox yaku
 |type        = Yaku
-|kanji       = ダブル立直 or ダブルリーチ
+|kanji       = 両立直 or ダブルリーチ
 |english     = Double ready
 |value       = 2 han
@@ Line 8: / Line 8: @@
 |gameExample = * [http://tenhou.net/0/?log=2012120515gm-0009-7447-637daef9&tw=3&ts=3 Double riichi]
 * [http://tenhou.net/0/?log=2012071323gm-0009-7833-xa0d19f28f26e&tw=0&ts=6 Double riichi] with [[furiten]]
-* [http://tenhou.net/0/?log=2014082913gm-00a9-0000-3e87e321&tw=03&ts=11 Double riichi] with [[ippatsu]]
+* [http://tenhou.net/0/?log=2016072423gm-00a9-0000-b0aed9e0&ts=8&tw=2 Double riichi denied]
 }}
-'''Daburu riichi''' {{kana|ダブル立直}} or {{kana|ダブルリーチ}}, or '''double riichi''', is a special case for [[riichi]].  In this case, the player's [[haipai|start hand]] is already at tenpai from the dealt tiles, or the initial draw produces a tenpai hand.  Naturally, a player has the option to declare riichi at this time.  No tile call may have interrupted 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}}, 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).
-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.
+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, [[kan]], even the player's own closed kan, will deny this yaku. In [[sanma]], [[kita]] calls will also deny this yaku.
 == Tenhou and Chihou ==
 {{main|Tenhou and chiihou}}
-It is very much possible to call a double riichi and be in [[furiten]] from the beginning.  However, this is a dubious play by which either the yakuman [[tenhou]] or [[chihou]] has been passed up, either intentionally or unintentionally.  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.
 == 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 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.
+[[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]]. 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. Since honor tiles cannot form [[Shuntsu|sequences]], they are the least likely to be a winning tile. 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. Eventually, players may reach tenpai and win for themselve.s
+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. The other types of draw (suukaikan, suucha riichi, sanchahou) are usually too dangerous to rely on, but they can get you out of the hand.
 == External links ==
+[[Image:Double riichi real.jpg|thumb|right|Double riichi with real tiles.]]
 {{jpwiki|ダブル立直}}