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Defense: Difference between revisions
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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 | ====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]]). | |||
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]]. | ||