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*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]].


Note that "half suji" tiles are not much safer than a regular tile. For instance, if a player has discarded 7-pin, 4-pin is not safe, because the 1-4 suji is not cleared. In order for 4 to be considered a full suji, both 1-pin and 7-pin have to be safe.
Note that 4, 5, and 6 require two suji to be safe, e.g. 4 requires both 1-4 and 4-7. A "half suji" is not much safer than a reguar tile. For instance, if a player has discarded 7-pin, 4-pin is not safe, because the 1-4 suji is not cleared. In order for 4 to be considered a full suji, both 1-pin and 7-pin have to be safe.


Using suji on the riichi declaration tile is more dangerous than normal. This is because of the ryankan shape (e.g. 135, 246, or 357). Ryankans are often kept as they can improve [[tile efficiency]]. But if the hand reaches tenpai with a ryankan intact, then it must discard one of the tiles. In this case, a player can discard the 5 and wait on the suji tile 2.
Using suji on the riichi declaration tile is more dangerous than normal. This is because of the ryankan shape (e.g. 135, 246, or 357). Ryankans are often kept as they can improve [[tile efficiency]]. But if the hand reaches tenpai with a ryankan intact, then it must discard one of the tiles. In this case, a player can discard the 5 and wait on the suji tile 2.
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