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Daburu riichi: Difference between revisions
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* [http://tenhou.net/0/?log=2016072423gm-00a9-0000-b0aed9e0&ts=8&tw=2 Double riichi denied] | * [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}}, 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 | '''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 [[tile call]], then riichi will automatically be converted into double riichi. Double riichi is worth 2 han, 1 more than the usual 1 han for 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 inherently 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. | ||
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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. | 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 | == Tenhou and Chiihou == | ||
{{main|Tenhou and chiihou}} | {{main|Tenhou and chiihou}} | ||
If a hand qualifies for [[Tenhou and chiihou|tenhou]]/[[chiihou]], it is still possible to declare double riichi. However, this would be a blunder, as it means giving up the yakuman (and entering [[furiten]]). For this reason, it is unwise to call double riichi before checking if the starting hand qualifies for a win. | |||
== Compatibility == | == Compatibility == | ||
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== Defending against double riichi == | == 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]].]] | [[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, other than its speed, is that it is difficult to defend against. When double riichi is declared, there will be almost no information in the [[discard pile]] to work with, leaving little/no safe tiles for [[defense]]. | |||
* If you have nothing better, [[honor]] tiles are the safest to discard. Since honors cannot form [[sequence]]s, it is less likely for an opponent to wait on one. The honor tile with the most visible copies is the safest; a [[yakuhai]] you can see two of is safer than a [[jikaze|guest wind]] you can see one of. If you can see an equal number of a yakuhai tile and a guest wind tile, choose the guest wind. | |||
* [[Suji]] is less effective. A player declaring double riichi is unable to choose to have a [[ryanmen]] wait. Suji relies on the opponent having a ryanmen, so it is not as effective. | |||
After a few discards | After a few turns, the player's discards will reveal some safe tiles. Due to the rules of riichi [[furiten]], any tile any player had discarded after a riichi is 100% safe against the riichi declarer. Therefore, safe tiles will rack up quickly. Eventually, players may reach tenpai and win for themselves. | ||
The threat of double riichi can also be ended via | 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 == | == External links == | ||