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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 relies on [[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]]).
'''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]]).


Suji 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 numbers in an interval will be paired, such as 1-4 or 2-5.
Suji 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 numbers in an interval will be paired, such as 1-4 or 2-5.


==Basic Theory==
==Basic Theory==
In short: a tile becomes safer against an opponent if they've discarded every possible tile (of the same suit) that is 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.)
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 explanation is as follows:
The explanation is as follows:
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