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Riichi: Difference between revisions
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m (→Open riichi: clarify: the yakuman rule is unrelated to "most professional games don't allow open riichi") |
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* The hand is closed - no [[chii]], [[pon]], or open [[kan]] has been made. | * The hand is closed - no [[chii]], [[pon]], or open [[kan]] has been made. | ||
* The hand is [[tenpai]] - it is one tile away from winning. | * The hand is [[tenpai]] - it is one tile away from winning. | ||
* | * The player must have at least 1,000 points (assuming the player is [[Rule_variations#Scoring|not allowed to go into negative points]]). | ||
* There must be at least 4 tiles left in the live wall. In other words, the player must be able to draw at least one more tile in an uninterrupted set of turns. | * There must be at least 4 tiles left in the live wall. In other words, the player must be able to draw at least one more tile in an uninterrupted set of turns. | ||
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{{main|Kan#Kan during riichi}} | {{main|Kan#Kan during riichi}} | ||
Kan during riichi | You are able to declare a closed [[kan]] after a riichi. When this is legal will depend on the ruleset; improper calls may be subject to [[chombo]]. See [[Kan#Kan during riichi|Kan during riichi]] for more details. Even if the kan is legal, you may or may not want to declare one. | ||
=== Furiten === | === Furiten === | ||
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===Noten riichi=== | ===Noten riichi=== | ||
In real life play, a player may declare riichi without tenpai - this would be a '''noten riichi''' {{kana| | In real life play, a player may declare riichi without tenpai - this would be a '''noten riichi''' {{kana|ノーテンリーチ}}, which is highly ill-advised. If the hand results in [[ryuukyoku]], then it is required to reveal the hand. The hand would naturally show noten, which is illegal, and thus subject to a [[chombo]] penalty. Likewise, an incorrectly called win would also be subject to chombo. This dubious situation can be escaped if another player wins, another player commits a chombo, or if an [[abortive draw]] occurs. Of course, most computer based play will prevent players from declaring a riichi without tenpai. | ||
== Scoring == | == Scoring == | ||
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=== Open riichi === | === Open riichi === | ||
'''Open riichi''' {{kana|オープン立直}} is an [[optional yaku]] which is a modified version of riichi. The mechanics are identical to a normal riichi, except that you must reveal either your entire hand or its tile [[wait]]s. In exchange, an open riichi is worth 1 extra han. Open riichi makes it trivial for other players to defend against your hand, so in general, the intent is to win by self-draw. | '''Open riichi''' {{kana|オープン立直}} is an [[optional yaku]] which is a modified version of riichi. The mechanics are identical to a normal riichi, except that you must reveal either your entire hand or its tile [[wait]]s (depending on ruleset). In exchange, an open riichi is worth 1 extra han. Open riichi makes it trivial for other players to defend against your hand, so in general, the intent is to win by self-draw. | ||
As a further optional rule, yakuman may be awarded if any player intentionally [[ron|plays into]] the open riichi. If a player unintentionally deals in, i.e. if a riichi player deals into an open riichi, the yakuman is not scored. | As a further optional rule, yakuman may be awarded if any player intentionally [[ron|plays into]] the open riichi. If a player unintentionally deals in, i.e. if a riichi player deals into an open riichi, the yakuman is not scored. | ||
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Once again, the prospect for [[rinshan kaihou]] to work with riichi is dependent on the legality of the [[Riichi#Kan_during_riichi|kan call during riichi]]. With computer interfaces, this rule may be enforced by disabling a player's ability to call the kan during this situation. However, with actual tiles, a player must be aware of this legality. Otherwise, chombo may be enforced instead. | Once again, the prospect for [[rinshan kaihou]] to work with riichi is dependent on the legality of the [[Riichi#Kan_during_riichi|kan call during riichi]]. With computer interfaces, this rule may be enforced by disabling a player's ability to call the kan during this situation. However, with actual tiles, a player must be aware of this legality. Otherwise, chombo may be enforced instead. | ||
== Strategy == | == Strategy == | ||