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Suji: Difference between revisions
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==Basic Theory== | ==Basic Theory== | ||
A tile is safer against an opponent ''if'' | A tile is safer against an opponent ''if'' every same-suit tile in an interval of 3 is [[genbutsu]] <small>(100% safe due to [[furiten]])</small> against that opponent. | ||
As a reminder, a tile is genbutsu if it was discarded by that opponent, if that opponent has declared riichi and then does not call [[ron]] that tile. In addition, | |||
In other words: | In other words: | ||
* | * If you have a 1/2/3 or 7/8/9 tile, and the tile that is 3-away is 100% safe, your tile is safer. | ||
* | * If you have a 4/5/6 tile, and both types of tiles that are 3 away are 100% safe, your tile is safer. | ||
For example, if an opponent had discarded a 4, then both 1 and 7 of the same suit are safer. If an opponent discarded both 1 and 7, then the 4 becomes safer. (If an opponent had only discarded a 1, the 4 is safer than normal, but still relatively dangerous.) | For example, if an opponent had discarded a 4, then both 1 and 7 of the same suit are safer. If an opponent discarded both 1 and 7, then the 4 becomes safer. (If an opponent had only discarded a 1, the 4 is still safer than normal, but still relatively dangerous.) | ||
===Why suji works=== | ===Why suji works=== | ||
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* 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> | * 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. | * [[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 tile in a suji interval is discarded, then the other tile in that interval become safer against that player. Genbutsu tiles are those that cause furiten, so tiles 3 away from genbutsu are safer than normal. | ||
** 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 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. | ** 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. | ||
==Intervals== | ==Intervals== | ||