Suji: Difference between revisions

Suji defends against [[ryanmen|open]] [[wait]]s <small>([[ryanmen]] wait)</small>. An open wait is a wait that wins off two sides of a sequence, e.g. a hand containing {23}, or a hand containing {34}.  

* The most common type of wait is an open wait, which appears in ~50% of all winning hands, and ~58% of all [[riichi]] hands.<ref>Riichi hands: https://docs.google.com/spreadsheets/d/1x1CYlIPYTeOodGY4bmPevlbyeZOIcmHICcQaoSjHJEk/edit?gid=295861978#gid=295861978</ref>

* [[Sequence]]s are comprised of three sequential tiles, so an open wait always will win off two tiles that are 3-apart. For example, a {23} ryanmen can win off either a 1 or 4 of the same suit. {34} can win off a 2 or 5 of the same suit. This continues until you get the intervals of: 1-4, 4-7, 2-5, 5-8, 3-6, and 6-9.

* If a player is affected by [[furiten]], they become unable to ron ''any'' tile. For example, if an opponent discards a 1, and waits on 1-4, they cannot ron 4. Therefore, if every 3-away tile is genbutsu, the remaining tile becomes safer, since it is impossible to have an open wait without being in furiten.

** If an opponent discards a 4, it is ''impossible'' for an opponent to have an open wait on 1 (without being in furiten). There is only one interval for the 1, that being 1-4, which is eliminated. Therefore, the 1 is safer against that opponent. Likewise, the 7 becomes safer when a 4 is discarded, due to the 4-7 interval being impossible.

** If an opponent discards a 1, it is not impossible for an opponent to have an open wait on 4. There are two different intervals for 4: 1-4 and 4-7. After discarding a 1, an opponent could still have an open wait on 4-7 interval. In order for the 4 to be a "full" suji, both 1 and 7 have to be discarded. The same logic applies to tiles numbered 5 and 6.