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Ryanmen: Difference between revisions
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Ryanmen is the most frequently used wait in the game, due to its strength and probability. Approximately 50% of all hands, and 66% of all [[riichi]] hands, use a ryanmen wait. | Ryanmen is the most frequently used wait in the game, due to its strength and probability. Approximately 50% of all hands, and 66% of all [[riichi]] hands, use a ryanmen wait. | ||
*It is the most powerful of the basic waits. A ryanmen waits for a maximum of 8 tiles of two different types. All other basic wait patterns can wait for a maximum of 4 tiles - ryanmen is twice as big. | *It is the most powerful of the basic waits. A ryanmen waits for a maximum of 8 tiles of two different types. All other basic wait patterns can wait for a maximum of 4 tiles - ryanmen is twice as big. | ||
*Unlike [[complex waits]], ryanmen only requires two tiles to form, | *Unlike [[complex waits]], ryanmen only requires two tiles to form. Therefore, ryanmen is much more likely to form than a complex wait. | ||
*[[Pinfu]], a common [[yaku]], requires a ryanmen or ryanmen-derived wait. | *[[Pinfu]], a common [[yaku]], requires a ryanmen or ryanmen-derived wait. | ||
Whether a hand is in [[tenpai]] or not, ryanmen waits are efficient to use. | Whether a hand is in [[tenpai]] or not, ryanmen waits are [[tile efficiency|efficient]] to gather and use. | ||
===Suji=== | ===Suji=== | ||
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{{main|Suji}} | {{main|Suji}} | ||
[[Suji]] (i.e. "mahjong intervals") is a [[defense|defensive]] concept directly related to ryanmen waits. In essence, when a tile is suji, it would be impossible for an opponent to have a ryanmen wait without being in [[furiten]]. | [[Suji]] (i.e. the "mahjong intervals") is a [[defense|defensive]] concept directly related to ryanmen waits. | ||
In essence, when a tile is suji, it would be impossible for an opponent to have a ryanmen wait without being in [[furiten]]. | |||
* A ryanmen will always wait on tiles that are three apart, forming the intervals: 1-4-7, 2-5-8, and 3-6-9. For example, a 2-3 ryanmen waits for either a 1 or 4, and is thus part of the 1-4-7 interval. | * A ryanmen will always wait on tiles that are three apart, forming the intervals: 1-4-7, 2-5-8, and 3-6-9. For example, a 2-3 ryanmen waits for either a 1 or 4, and is thus part of the 1-4-7 interval. | ||
* Therefore, if an opponent discards a 4, they cannot have a ryanmen wait on a 1 or 7 of the same suit (without being in [[furiten]], which would prevent them from winning off ''your'' discarded tile). So after an opponent discards a 4, it is safer to discard a 1 or 7. | * Therefore, if an opponent discards a 4, they cannot have a ryanmen wait on a 1 or 7 of the same suit (without being in [[furiten]], which would prevent them from winning off ''your'' discarded tile). So after an opponent discards a 4, it is safer to discard a 1 or 7. | ||
* If the opponent discards a 1, then the 4 is not necessarily safe: they could still have a 4-7 ryanmen wait. For 4 to be "full" suji, both 1 and 7 must be discarded. | * If the opponent discards a 1, then the 4 is not necessarily safe: they could still have a 4-7 ryanmen wait. For 4 to be "full" suji, both 1 and 7 must be discarded. | ||
Suji works because ryanmen is so effective and common. | |||
==Related Complex Waits== | ==Related Complex Waits== | ||