Suji: Difference between revisions

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*Early discarded {{#mjt:5p}} makes {{#mjt:14p}} and {{#mjt:69p}} more dangerous.
*Early discarded {{#mjt:5p}} makes {{#mjt:14p}} and {{#mjt:69p}} more dangerous.


(Discarded 1/2/8/9 tiles are not particularly noteworthy, since these tiles are often discarded early anyways.)
(Early discarded 1/2/8/9 tiles are not particularly noteworthy, since these tiles are often discarded early anyways.)


In the modern day, ura suji is often disregarded. It is true that, if an opponent discards a 5-pin early, then a non-suji 4-pin is at least somewhat more dangerous than normal. 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. It is true that, if an opponent discards a 5-pin early, then a non-suji 4-pin is at least somewhat more dangerous than normal. 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-safe non-suji tiles unless you had to. Even if you did, you wouldn't discard a middle tile if you could avoid it.
*If you were folding, you would not discard any non-safe non-suji tiles unless you had to. Even if you did, you wouldn't discard a middle tile if you could avoid it.
*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 so much more dangerous than a regular non-suji tile.
 
*In addition, ura suji theory assumes your opponent is going for maximum [[tile efficiency]]. If an opponent had sacrificed efficiency for points, it doesn't work.
In addition, ura suji theory assumes your opponent is going for maximum [[tile efficiency]].  


The reason ura suji is not that much more dangerous than normal is because it assumes a (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. Even if the kanchan did exist, an opponent could have completed the 23 sequence before reaching tenpai.
The reason ura suji is not that much more dangerous than normal is because it assumes a (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. Even if the kanchan did exist, an opponent could have completed the 23 sequence before reaching tenpai.
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