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'''Ippatsu''' {{kana|一発}} is a yaku completely dependent on [[riichi]]. | '''Ippatsu''' {{kana|一発}} is a yaku that is completely dependent on [[riichi]]. After declaring riichi, if the player wins before their next discard, and before anyone makes a [[naki|tile call]], then ippatsu is awarded. You must declare riichi to score ippatsu, so a hand can never have ippatsu by itself. | ||
While ippatsu is generally considered to be a standard yaku, certain [[rule variations|rulesets]] do not use it, in order to reduce variance and lower the value of a riichii. In general, when sitting down to play a game, ippatsu is counted unless otherwise specified or agreed on before the game. | |||
== Development == | |||
In order for ippatsu to be counted, the hand must win before the hand in riichi discards its next tile. The earliest possible chance to win with ippatsu comes from the shimocha's discard (player to the right). The latest possible chance to win with ippatsu is with the player's next drawn tile after the riichi declaration. | |||
Furthermore, no interruption to the turn must occur. This means that [[Naki|tile calls]] will immediately end the chance for ippatsu. This includes any calls for [[kan]] ''except'' for a robbed kan ([[chankan]]). In [[sanma]], the call for [[kita]] also denies ippatsu. If the riichi player declares kan or kita, ippatsu is still denied. | |||
To repeat: even if a hand is won before the next discard, if a call is made, ippatsu is denied. Thus, players can purposefully make tile calls in order to disrupt another player's chance for ippatsu. | |||
== Examples == | == Examples == | ||
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{{main|Yaku compatibility}} | {{main|Yaku compatibility}} | ||
{{Yaku compatibility table|IPP}} | {{Yaku compatibility table|IPP}} | ||
Ippatsu is unique | Ippatsu is unique as it requires riichi to even be applicable. Thus, it is impossible for a hand to score with ippatsu alone. At the very minimum, a hand could be riichi with ippatsu. | ||
At the very minimum, a hand could be riichi with ippatsu. | |||
Unlike riichi, ippatsu cannot be combined with two yaku: [[rinshan kaihou]] and [[houtei raoyui]]. Rinshan requires a [[kan]] call, which would invalidate ippatsu. As for houtei, a riichi declaration must be made with at least 4 tiles left in the live wall. That leaves the very last possible tile draw (and discard) belonging to the riichi declarer. | |||
Note that [[chankan]] ''is'' compatible with ippatsu. When winning off chankan, the kan call is interrupted, so ippatsu is retained. | |||
===With haitei=== | ===With haitei=== | ||
[[Image:Last chance riichi.png|thumb|250px|right|Last chance to call riichi, with possible [http://tenhou.net/0/?log=2013062617gm-0089-0000-xa37799b6321c&tw=3&ts=4 Ippatsu] and [[haitei]].]] | [[Image:Last chance riichi.png|thumb|250px|right|Last chance to call riichi, with possible [http://tenhou.net/0/?log=2013062617gm-0089-0000-xa37799b6321c&tw=3&ts=4 Ippatsu] and [[haitei]].]] | ||
The last possible chance for riichi comes | The last possible chance for riichi comes when there are eighteen tiles left in the walls, counting the fourteen tiles in the dead wall. That leaves four tiles left for regular player draws. After the last possible riichi, if no tiles are called, every player would have exactly one tile draw left. Therefore, the last tile would go to the riichi declarer, allowing both ippatsu and [[haitei]] to be scored. Naturally, players may make tile calls to disrupt both yaku. | ||
== External links == | == External links == |
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