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{{main|Suji}}
{{main|Suji}}


'''Suji''' focuses on taking advantage of the furiten rule, and its application to the mahjong octaves. Most good waits wait on tiles in the same suji. For example, if a player has discarded 4-pin, the 1-pin and 7-pin are safe if the opponent has a ryanmen wait. Neither is perfectly safe, however, and the 7-pin is much more dangerous than the 1-pin. This is because the 1-pin can only complete a shanpon or tanki wait, while the 7-pin can also complete a penchan or kanchan wait. A discarded 8-sou does not make the 5-sou safe, but if both 8-sou and 2-sou are discarded, the 5-sou is suji. The order of suji safety is 19>double-suji 456>28>37.
'''Suji''' focuses on taking advantage of the furiten rule, and its application to the "mahjong intervals". Most good waits wait on tiles in the same suji. For example, if a player has discarded 4-pin, the 1-pin and 7-pin are safe if the opponent has a ryanmen wait. Neither is perfectly safe, however, and the 7-pin is much more dangerous than the 1-pin. This is because the 1-pin can only complete a shanpon or tanki wait, while the 7-pin can also complete a penchan or kanchan wait. A discarded 8-sou does not make the 5-sou safe, but if both 8-sou and 2-sou are discarded, the 5-sou is suji. The order of suji safety is 19>double-suji 456>28>37.


On the other hand, this strategy may actually work backwards, when suji is actually used to bait players into discarding tiles that appear to be safe. Suji tiles of tiles discarded after riichi are safer for this reason, while tiles discarded right before riichi and when declaring riichi are the most dangerous. It is common to riichi discarding 6 from 246 to bait out the 3. Players also declare riichi with bad waits, and suji is useless against them. Relying only in suji to defend will result in many play-ins. Suji should be used when genbutsu tiles have ran out, or in Uchi-mawashi.
On the other hand, this strategy may actually work backwards, when suji is actually used to bait players into discarding tiles that appear to be safe. Suji tiles of tiles discarded after riichi are safer for this reason, while tiles discarded right before riichi and when declaring riichi are the most dangerous. It is common to riichi discarding 6 from 246 to bait out the 3. Players also declare riichi with bad waits, and suji is useless against them. Relying only in suji to defend will result in many play-ins. Suji should be used when genbutsu tiles have ran out, or in Uchi-mawashi.
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