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Suji: Difference between revisions
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== Defense == | == Defense == | ||
Suji | Suji relies on the fact that a player is using a [[ryanmen]] wait, or a related wait like [[ryanmenten]], [[nobetan]], or [[sanmentan]]. Ryanmen itself appears in around ~50% of winning hands, which is common, but not even close to guaranteed. For example, hands like [[toitoi]] and [[chiitoitsu]] are immune to suji. | ||
Note that the middle tiles (4,5,6) have two different suji intervals to account for. For example, 4 is part of the intervals 1-4 and 4-7. If an opponent discards a 7, the 4 isn't much safer, because the ryanmen of 1-4 is still present. In order to make 4 safer, both 1 and 7 must be safe. If both 1 and 7 are safe, then 4 is considered a nakasuji. The same applies to the other intervals. | Note that the middle tiles (4,5,6) have two different suji intervals to account for. For example, 4 is part of the intervals 1-4 and 4-7. If an opponent discards a 7, the 4 isn't much safer, because the ryanmen of 1-4 is still present. In order to make 4 safer, both 1 and 7 must be safe. If both 1 and 7 are safe, then 4 is considered a nakasuji. The same applies to the other intervals. | ||
Not all suji are equally safe. This is because some tiles can be targeted by [[ | Not all suji are equally safe. This is because some tiles can be targeted by [[kanchan]] (24) or [[penchan]] (12) waits. | ||
*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]]. | ||
*Suji 2 and 8, as well as a completed nakasuji (4,5,6), are the next safest. They can be targeted by a tanki, shanpon, or kanchan. | *Suji 2 and 8, as well as a completed nakasuji (4,5,6), are the next safest. They can be targeted by a tanki, shanpon, or kanchan. | ||
*Suji 3 and 7 are the most dangerous, though still reasonably safe. They can be targeted by a tanki, shanpon, kanchan, or penchan. | *Suji 3 and 7 are the most dangerous, though still reasonably safe. They can be targeted by a tanki, shanpon, kanchan, or penchan. | ||
*"Half suji" tiles, e.g. a 4 after only a 7 has been discarded, are not much safer than a regular tile. | |||
"Half suji" tiles, e.g. a 4 after only a 7 has been discarded, are not much safer than a regular tile. | |||
Suji based off the riichi declaration tile is considered to be more dangerous than normal. This is due to the strength of a ryankan shape. See the [[#Offense|Offense]] section for more information. | Suji based off the riichi declaration tile is considered to be more dangerous than normal. This is due to the strength of a ryankan shape. See the [[#Offense|Offense]] section for more information. | ||
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===Checklist=== | ===Checklist=== | ||
For defense, eighteen different suji are in consideration | For defense, eighteen different suji are in consideration: there are six basic suji for each suit, and three suits total. By counting the number of visible suji, players can determine roughly how risky it is to discard a dangerous tile. | ||
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Say an opponent declares riichi on [[double riichi|turn 1]], discarding an honor tile, and your turn is next. If we assume the opponent has a ryanmen wait, there is only a 1/18 chance that any one of the untested suji intervals deals in. | Say an opponent declares riichi on [[double riichi|turn 1]], discarding an honor tile, and your turn is next. If we assume the opponent has a ryanmen wait, there is only a 1/18 chance that any one of the untested suji intervals deals in. | ||
If an opponent declares riichi after discarding 4-man, 2-pin, 6-pin, and 5-sou, then the following suji are safe: 1-4 man, | If an opponent declares riichi after discarding 4-man, 2-pin, 6-pin, and 5-sou, then the following suji are safe: 1-4 man, 4-7 man, 2-5 pin, 3-6 pin, 6-9 pin, 2-5 sou, and 5-8 sou. This "eliminates" 8 suji intervals, leaving 10 intervals unaccounted for. Therefore, if we assume the opponent has a ryanmen wait, an untested suji has a 1/10 chance to deal in. Basically, as more tiles become safe, the more dangerous the non-safe tiles become. | ||
== Offense == | == Offense == | ||
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In the modern day, ura suji is often disregarded. If an opponent discards 5-pin early, then declares riichi, then non-suji 4-pin would be a dangerous tile. However, a non-suji 4-man, 5-man, 4-sou, etc. would also be dangerous tiles. Therefore, knowing about ura suji would not change your behavior. | In the modern day, ura suji is often disregarded. If an opponent discards 5-pin early, then declares riichi, then non-suji 4-pin would be a dangerous tile. However, a non-suji 4-man, 5-man, 4-sou, etc. would also be dangerous tiles. Therefore, knowing about ura suji would not change your behavior. | ||
*If you were folding, you would not discard any non-suji unless you had to. | *If you were folding, you would not discard any non-safe non-suji tiles unless you had to. | ||
*If you were attacking, you would discard ura suji anyways, because an ura suji is not that much more dangerous than a regular non-suji tile. | *If you were attacking, you would discard ura suji anyways, because an ura suji is not that much more dangerous than a regular non-suji tile. | ||
In addition, ura suji assumes your opponent is going for maximum [[tile efficiency]]. It also assumes that the 35 kanchan had existed in the first place. The 5-pin could have been an unrelated tile, or it could have been part of a 57 kanchan, or part of a completed 556 shape, or part of a completed 135 shape, | In addition, ura suji assumes your opponent is going for maximum [[tile efficiency]]. It also assumes that the 35 kanchan had existed in the first place. The 5-pin could have been an unrelated tile, or it could have been part of a 57 kanchan, or part of a completed 556 shape, or part of a completed 135 shape, etc. Finally, the opponent could've completed the 23 before | ||
== External links == | == External links == | ||