Suji: Difference between revisions

'''Suji''' {{kana|筋}} is a [[defense|defensive]] tactic that uses [[discard]]s and the [[furiten]] rule to determine which tiles are safer against a specific opponent. Suji only applies to number tiles ([[manzu]], [[pinzu]], [[souzu]]).

In short: a tile becomes safer against an opponent if they've discarded every possible tile (of the same suit) that is in an interval of 3 from that tile. For example, if an opponent had discarded a 4, then both 1 and 7 of the same suit are safer. If an opponent discarded both 1 and 7, then the 4 becomes safer. (If an opponent had only discarded a 1, the 4 is not much safer.)

The intervals for suji apply to any of the numbered suits.  Nine types of intervals are available.  For these examples, only 1 suit is used per interval, but all intervals apply to every suit.

{| class="wikitable" width=100%

!width=20%| Middle tiles !!width=10%| Waiting for !!width=30%| Interval name !!width=40%| Completion

|colspan=4 align=center|''Two-sided'', or ''[[Ryanmen]]''

| {{#mjt:23p}} || {{#mjt:14p}} || 1-4, or Iisuu {{kana|イースー}} || {{#mjt:123p}} or {{#mjt:234p}}  

| {{#mjt:34m}} || {{#mjt:25m}} || 2-5, or Ryanuu {{kana|リャンウー}} || {{#mjt:234m}} or {{#mjt:345m}}

| {{#mjt:45s}} || {{#mjt:36s}} || 3-6, or Saburou {{kana|サブロー}} || {{#mjt:345s}} or {{#mjt:456s}}

| {{#mjt:56p}} || {{#mjt:47p}} || 4-7, or Suuchii {{kana|スーチー}} || {{#mjt:456p}} or {{#mjt:567p}}  

| {{#mjt:78s}} || {{#mjt:69s}} || 6-9, or Roukyuu {{kana|ローキュー}} || {{#mjt:678s}} or {{#mjt:789s}}

| {{#mjt:45678s}} || {{#mjt:369s}} || 3-6-9, or Saburoukyuu {{kana|サブローキュー}} || {{#mjt:345s}} and {{#mjt:678s}}<br>OR<br>{{#mjt:456s}} and {{#mjt:678s}}<br>OR<br>{{#mjt:456s}} and {{#mjt:789s}}

The left column shows tiles that may appear in a player's hand, while the middle tiles show the tiles needed in order to complete a needed [[mentsu|tile group]]. The recognition makes it helpful to identify waiting tiles by association.  In the case of these [[machi|waiting patterns]], if a hand is waiting for one tile, it is likely waiting for another tile in the interval.  Even if these take on Japanese names, they are simply the numbers.  Finally, the end result shows the the waiting tiles as the completed tile grouping(s).

'''Nakasuji''' {{kana|中筋}} is literally the "middle suji".  In other words, given the three different intervals, they are the middle numbers of 4, 5, and 6.