Ippatsu: Difference between revisions

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== Development ==
== 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.  
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.
Furthermore, no interruption to the turn must occur. This means that [[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.  
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.  
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* [http://tenhou.net/0/?log=2013061615gm-0089-0000-x380955c19e8f&tw=0&ts=3 Ippatsu] after [[kan]].
* [http://tenhou.net/0/?log=2013061615gm-0089-0000-x380955c19e8f&tw=0&ts=3 Ippatsu] after [[kan]].


:Kan is called prior to the riichi call; and the hand wins on the next draw without interruption.  Therefore, ippatsu is valid.
:Kan is called prior to the riichi call, and the hand wins on the next draw without interruption, so ippatsu is scored.


* [http://tenhou.net/0/?log=2014081719gm-0009-7447-73936980&tw=1 Ippatsu on discard]
* [http://tenhou.net/0/?log=2014081719gm-0009-7447-73936980&tw=1 Ippatsu on discard]
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* [http://tenhou.net/0/?log=2012110819gm-0009-7447-b68a0585&tw=2&ts=4 Ippatsu blocked] by [[Naki|tile calls]]
* [http://tenhou.net/0/?log=2012110819gm-0009-7447-b68a0585&tw=2&ts=4 Ippatsu blocked] by [[Naki|tile calls]]


In this example, the hand wins from an opponent discard before the next tile draw. However, two tile calls were made prior to the win.  So, ippatsu is invalid here.
In this example, the hand wins from an opponent discard before the next tile draw. However, two tile calls were made prior to the win, so ippatsu is not scored.


== Compatibility ==
== Compatibility ==
1,758

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