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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 | 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% | ||
|- | |- | ||
! | !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 | '''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. | ||
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. | ||