Suji: Difference between revisions

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 {{Mahjong intervals|caption=Read the numbers across.}}
-'''Suji''' {{kana|筋}} is a [[defense|defensive]] tactic that uses the [[furiten]] rule to determine which tiles are safer against a specific opponent. It only applies to number tiles ([[manzu]], [[pinzu]], [[souzu]]).
+'''Suji''' {{kana|筋}} is a [[defense|defensive]] tactic that uses the [[furiten]] rule to determine which tiles are safer against a specific opponent. When a tile is suji, a it is impossible for an opponent to have a [[ryanmen|certain type of wait]] without being in furiten. It only applies to number tiles ([[manzu]], [[pinzu]], [[souzu]]).
-It relies on the "mahjong intervals" of 1-4-7, 2-5-8, and 3-6-9, as shown in the picture to the right. When using suji, two adjacent numbers in an interval will be grouped, such as 1-4 or 2-5.
+When using suji, it is helpful to know the "mahjong intervals" of 1-4-7, 2-5-8, and 3-6-9, as shown in the picture to the right.
 ==Basic Theory==
-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.)
+A tile is safer against an opponent ''if'' they've discarded every type of tile (of the same suit) within an interval of three from your tile.
-The explanation is as follows:
+In other words:
+* With a 1/2/3 or 7/8/9 tile: if an opponent has discarded a tile that is 3 away, that tile is safer.
+* With a 4/5/6 tile: if an opponent has discarded two different tiles that are 3 away, that tile is safer.
+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 safer than normal, but still relatively dangerous.)
+===Why suji works===
+Suji defends against [[ryanmen]] waits
 *The most common type of wait is an [[ryanmen|open]] [[wait]] (i.e. [[ryanmen]] wait). An open wait is a wait that wins off two sides of a sequence, e.g. a hand containing {23}, or a hand containing {34}.