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'''Suji''' takes advantage of the furiten rule and uses it to eliminate the most common type of wait.
'''Suji''' takes advantage of the furiten rule and uses it to eliminate the most common type of wait.


Suji states that, '''when a number tile is safe, other tiles that are 3-apart become safer.''' This is because a [[ryanmen]] wait, a two-sided wait to complete a sequence (e.g. {23} waiting for 1 or 4), is the most frequent wait in the game. A ryanmen always waits on tiles in an interval of 3, such as 1-4 or 4-7. Therefore, if a 4-pin is safe against a player, the 1-pin and 7-pin become safer against that player. Neither 1 or 7 is perfectly safe, but are significantly safer than normal.  
====Theory====
Suji states that, '''when a number tile is safe against a player, other tiles that are 3-apart become safer'''. A "safe" tile is a tile that would trigger [[furiten]] (either a tile discarded by that player, or any discarded tile after that player calls [[riichi]]).


There are three major intervals: 1-4-7, 2-5-8, and 3-6-9. These intervals of 3 are called "suji intervals".  
This is because a [[ryanmen]] wait, a two-sided wait to complete a sequence (e.g. {23} waiting for 1 or 4), is the most frequent wait in the game. A ryanmen always waits on tiles in an interval of 3, such as 1-4 or 4-7. If a player discards 4-pin, then that player cannot have a ryanmen wait on 1-pin or 7-pin without being in furiten. Therefore, when 4-pin is safe, 1-pin and 7-pin become safer. While neither 1-pin or 7-pin are perfectly safe, they are significantly safer than normal.


It is important to note that the middle tiles (4, 5, 6) require two tiles to be considered true suji. This is because the 4 is part of two suji intervals: 1-4 and 4-7. If a 1 is discarded, a player could still have a 4-7 ryanmen. The 4 is only full suji if ''both'' 1 and 7 are safe.
It is important to note that the middle tiles (4, 5, 6) require two tiles to be considered true suji. This is because the 4 is part of two suji intervals: 1-4 and 4-7. If a 1 is discarded, a player could still have a 4-7 ryanmen. The 4 is only full suji if ''both'' 1 and 7 are safe.


There are three major intervals: 1-4-7, 2-5-8, and 3-6-9. These intervals of 3 are called "suji intervals".
====Safety Level====
Some suji are safer than others:
Some suji are safer than others:
*Suji terminals (1 and 9) are the safest, as they can only be targeted by a [[tanki]] or [[shanpon]].
*Suji terminals (1 and 9) are the safest, as they can only be targeted by a [[tanki]] or [[shanpon]].
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