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Suji: Difference between revisions
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{{Mahjong intervals|caption=Read the numbers across.}} | {{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]]). | ||
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== | ==Basic Theory== | ||
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. | |||
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}. | *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}. | ||