Riichi
| Type | Yaku |
|---|---|
| Kanji | 立直 or リーチ |
| Français | {{{français}}} |
| Valeur | 1 han (closed only) |
| Rapidité | Varies |
| Difficulté | At discretion |
| Exemple(s) | |
| Plus d'exemples | |
Riichi 「立直」 ou 「リーチ」 est le yaku le plus souvent utilisé dans le jeu. Ce yaku peut s'appliquer à n'importe quelle main fermée, et être déclaré lorsqu'un joueur est tenpai. À cause de son utilisation fréquente, divers scénarios de jeu doivent être envisagés en déclarant riichi, ou contre les adversaires qui ont déclaré riichi.
Contrairement aux autres yakus, la déclaration de riichi se fait à la discrétion du joueur, et n'est jamais obligatoire. Un joueur peut simplement décider de ne pas déclarer riichi, et garder secret le statut de tenpai (???) de sa main, une technique appelée damaten. La décision de faire riichi repose sur plusieurs facteurs, principalement le besoin de le faire. Le compte des scores appelle souvent au riichi, surtout lorsque le joueur a moins de points que ses adversaires. D'un autre côté, les joueurs avantagés peuvent avoir tendance à jouer prudemment, pour réduire les chances des autres joueurs de marquer une main directement.
Sommaire
Règles
Quand un joueur a une main fermée tenpai, il peut déclarer riichi, ce qui offre 1 han à sa main. Pour déclarer riichi, le joueur annonce riichi et défausse une tuile, en la tournant de côté dans la pile de défausse, ceci afin d'indiquer le tour où le riichi a été déclaré. Si cette tuile est récupérée par un autre joueur pour une figure ouverte ?? (open meld), la prochaine tuile défaussée sera tournée de côté à la place.
À moins que la première tuile tournée de côté soit récupérée immédiatement, et que cela donne la victoire à l'adversaire, le joueur qui annonce riichi pose une mise de 1 000 points sur la table. Cette mise est remportée par le prochain joueur qui gagne un tour. Bien sûr, le joueur doit avoir 1 000 points pour déclarer riichi, si le jeu se termine sur des scores négatifs. Certaines variantes définissent de manière différentes ce qu'ils se passe en cas de victoires multiples.
Après une déclaration de riichi, la main est bloquée, et ne plus pas être modifiée. À ce moment, le joueur est en atteinte d'une tuile gagnante, soit en la tirant lui-même, soit défaussée par un autre joueur. Cependant, il y a une exception pour le cas des déclarations de kans.
Un joueur ne peut pas déclarer riichi s'il reste moins de quatre tuiles dans le mur. Il doit pouvoir tirer une autre tuile à un autre tour. Dans tous les cas, le joueur ne peut déclarer riichi que s'il lui est encore possible de gagner avec riichi, ippatsu et mentsumo.
Noten riichi
A player may actually declare riichi with a noten hand. This is a noten riichi 「ノテン立直」. This type of play is highly not advisable. If and when the hand results in ryuukyoku, then it is required of the player to reveal the hand to show tenpai. The noten riichi would naturally show noten; and it is subject to chombo. Likewise, chombo is applied if a win is called, as the hand's winning status would be verified only to reveal an invalid hand. Playeer may escape this dubious position, when another player wins the hand or has committed a chombo penalty. Of course, computer based play is usually programmed to prevent players from making such a riichi declaration.
Kan during riichi
When a riichi declarer holds three identical tiles and draws the fourth after the riichi announcement, he may form an ankan from these tiles instead of discarding the fourth. The hand composition and the possible winning tiles may not change: it is not allowed to declare kan if, for some possible winning tile, any of the three identical tiles may be interpreted as part of a sequence or part of the pair.
If a player does declare a kan illegally during riichi, and they call ron or the game goes to an exhaustive draw, then they will be penalized with a chombo penalty for breaking the rule. If a player is not required to reveal their hand, or if another player wins, they will normally not be penalized.
Example 1:
Illegal kan: Legal kan: .
It is not allowed to kan the fours. The manzu tiles may either be interpreted as a 3-4 ryanmen wait and a 4-4 pair, or as a 4-man ankou with a 3-man tanki wait. A kan call would alter the wait just for a 3-man tanki. For a legal kan declaration, the three identical tiles would have to be an ankou in any interpretation. Had the player drawn a west wind, he would have been allowed to kan it.
Example 2:
Legal kan: or .
In this example, none of the waits are affected by any of the kan possibilities. The waiting tiles are completely unrelated to any of the existing triplets in this hand. Therefore, it is acceptable to call kan during riichi here.
Example 3:
Illegal kan:
Here, the waits are 457p. A kan on 6p would remove the 7p wait, so it is obviously not permitted. A kan on the 3p would not change the waits, however, if the hand was won with 4p, the hand could be interpreted as:
In this case, the 3p does not form a triplet, but rather a pair and a part of a sequence. A kan on the 3p would remove this potential interpretation of the hand, and is therefore forbidden.
Furiten
During riichi, a player may be furiten. In this case, the riichi is considered to be a furiten riichi. Likewise, after calling riichi, a player may decline the option to call on a winning tile, whether it be by self-draw or by discard. However, if a win is declined, then the riichi declared hand is subject to furiten for the remainder of the hand. Thus, all tiles discarded after the riichi declaration, as indicated by the discarded sideways tile, are considered to be guaranteed safe tiles. While it is advised to declare a win on the first opportunity, some plays may require a player not to do so under very specific circumstances. Of course, such play requires caution.
Uradora
When a riichi declarer wins, he may flip the tiles underneath the dora and kan dora indicators. These flipped ura dora indicators may increase the value of his hand.
Tochuu ryuukyoku
Tochuu ryuukyoku, or abortive draw, is in effect when suucha riichi occurs. In this case, three riichis have been called; and a fourth one is called in place. If the discarded tile is not claimed for a win, then the hand ends.
Open riichi
Open riichi 「オープン立直」 is an optional yaku, which is a modified version to riichi itself. The principle works exactly in the same way as the original riichi. However, there is an added bonus of 1-han attached, which is earned by revealing either the hand or the tile waits. This naturally eases everyone else's ability to defend against the riichi. As a further optional rule, yakuman may be awarded if any player actually plays into the open riichi. This is more or less a harsh penalty for playing into a revealed hand. Many official organizations and tournaments do not implement open riichi. It is more or less reserved for casual game or gambling setting.
Riichi based yaku
Two yaku are specifically associated with riichi: ippatsu and double riichi.
Ippatsu
Ippatsu 「一発」 is a separate yaku but is very dependent on riichi. Riichi is required to score ippatsu, as the yaku is defined as a riichi winning before the declarer's next discard. Tile calls, including kan, are able to nullify ippatsu by denying it.
Double riichi
Double riichi 「ダブルリーチ」 is a special case for riichi. Here, the player declares riichi on the first turn before one's own discard. No tile call may have interrupted the turn order before the declaration, where applicable. For the dealer, double riichi can never be interrupted. As the name implies, this yaku is worth 2 han instead of 1 han, 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 and value compared to conventional riichi calls.
Compatibility
^ Ippatsu a besoin de riichi.
| RCH | DRI | IPP | SMO | TAN | PFU | IPK | ITT | YAK | SDJ | SDO | TOI | SNA | SNK | CHA | JUN | RPK | SSG | HRO | HON | CHN | CHI | RIN | HAI | HOU | CHK | |
| RCH |  |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
| DRI | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Given the rules, riichi is compatible with all other yaku. Likewise, riichi and double riichi cannot be combined as they are essentially the same yaku. It just happens that double riichi is a specific instance of riichi. Per rule and definition, it is impossible to attain ippatsu without riichi.
Once again, the prospect for rinshan kaihou to work with riichi is dependent on the legality of the 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
Calling riichi is an optional play. Therefore, players often have to make various considerations, when it comes to using riichi. Often, this depends on the discarded tiles, how early or late in the hand, the hand value, and/or the player's hand composition. If possible, a player may opt not to use riichi at all and instead employ the strategy of damaten.
External links
- Riichi sur la Wikipédia japonaise
| |||||||||||||||||||||||||||||||
