Suji: Difference between revisions

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adjust nakasuji section, and the intervals section a bit
(remove the sanmenchan wait patterns, since they aren't *really* relevant for suji. also remove the JP names (more confusing than anything))
(adjust nakasuji section, and the intervals section a bit)
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**If an opponent discards a 1, it is not impossible for an opponent to have an open wait on 4. There are two different intervals for 4: 1-4 and 4-7. After discarding a 1, an opponent could still have an open wait on 4-7 interval. In order for the 4 to be a "full" suji, both 1 and 7 have to be discarded. The same logic applies to tiles numbered 5 and 6.
**If an opponent discards a 1, it is not impossible for an opponent to have an open wait on 4. There are two different intervals for 4: 1-4 and 4-7. After discarding a 1, an opponent could still have an open wait on 4-7 interval. In order for the 4 to be a "full" suji, both 1 and 7 have to be discarded. The same logic applies to tiles numbered 5 and 6.


Note: suji applies to any form of furiten, not just discard furiten. So long as a tile is [[genbutsu]] (an opponent would be furiten if they were waiting on that tile), then the suji of that tile are safe. Most importantly: after an opponent declares [[riichi]], then any non-winning tile discarded by anyone becomes safe through furiten. Therefore, suji can also be applied to those discarded tiles. So if an opponent declares riichi, and the next opponent discards a 4, then 1 and 7 are considered suji against the riichi-declarer.
Note: suji applies to the other forms of furiten, not just discard furiten. So long as a tile is [[genbutsu]] (an opponent would be furiten if they were waiting on that tile), then the suji of that tile are safe. Most importantly: after an opponent declares [[riichi]], then any non-winning tile discarded by anyone becomes safe through furiten. Therefore, suji can also be applied to those discarded tiles. So if an opponent declares riichi, and the next opponent discards a 4, then 1 and 7 are considered suji against the riichi-declarer.


==Intervals==
==Intervals==
There are 6 distinct suji intervals per suit.
There are 6 distinct suji intervals per suit; each suit has all 6 intervals shown below.


{| class="wikitable" width=50%
{| class="wikitable" width=50%
|-
|-
!Middle tiles !! Waiting for !! Completion
!Wait pattern !! Waiting for !! Completion
|-
|-
| {{#mjt:23p}} || {{#mjt:14p}} || {{#mjt:123p}} or {{#mjt:234p}}  
| {{#mjt:23p}} || {{#mjt:14p}} || {{#mjt:123p}} or {{#mjt:234p}}  
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|}
|}


The left column shows tiles that could be in the player's hand, while the middle column shows the tiles needed in order to complete that [[tile group]]. If a hand is waiting for one tile, it is likely waiting for another tile in the suji interval.
The left column shows the tiles that could be in the player's hand, while the middle column shows the tiles needed in order to complete that [[tile group]]. If a hand is waiting for one tile, it is likely waiting for another tile in the suji interval.


===Nakasuji===
===Nakasuji===
'''Nakasuji''' {{kana|中筋}} is literally the "middle suji"; it refers to a 4/5/6 tile that has both of its "suji"
'''Nakasuji''' {{kana|中筋}} is literally the "middle suji"; it refers to a 4/5/6 tile when both tiles in its suji interval have been discarded before.
 
As mentioned above, the middle tiles (4,5,6) have two suji intervals to account for. A 4 has two suji intervals, 1-4 and 4-7. A discarded 1 does not make 4 much safer, because an opponent could still have a 4-7 ryanmen wait. In order for 4 to be a "full" suji, both 1 and 7 have to be safe. If both 1 and 7 have been discarded, 4 is a nakasuji.


== Defense ==
== Defense ==
Suji relies on the fact that a player is likely to use a [[ryanmen]] wait, or a related wait like [[ryanmenten]], [[nobetan]], or [[sanmentan]]. Ryanmen itself appears in around ~50% of winning hands, which is common, but not even close to guaranteed. Hands that do not use ryanmen, like [[toitoi]] and [[chiitoitsu]], are immune to suji.
Suji relies on the fact that a player is likely to use a [[ryanmen]] wait, or a related wait like [[ryanmenten]], [[nobetan]], or [[sanmentan]]. Ryanmen itself appears in around ~50% of winning hands, which is common, but not even close to guaranteed. Hands that do not use ryanmen, like [[toitoi]] and [[chiitoitsu]], are immune to suji.
As mentioned above, the middle tiles (4,5,6) have two suji intervals to account for. A 4 has two suji intervals, 1-4 and 4-7. A discarded 1 does not make 4 much safer, because an opponent could still have a 4-7 ryanmen wait. In order for 4 to be a "full" suji, both 1 and 7 have to be safe.


Not all suji are equally safe. This is because some tiles can be targeted by [[kanchan]] (24) or [[penchan]] (12) waits.
Not all suji are equally safe. This is because some tiles can be targeted by [[kanchan]] (24) or [[penchan]] (12) waits.
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