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Tile efficiency: Difference between revisions
→Important concepts: + duplicate acceptance section
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**You can upgrade one of your joints (e.g. turning a 45 ryanmen joint into a 445 complex joint). | **You can upgrade one of your joints (e.g. turning a 45 ryanmen joint into a 445 complex joint). | ||
**You enter 1-shanten. | **You enter 1-shanten. | ||
**You have multiple kanchan/penchans and you get | **You have multiple kanchan/penchans and you get an isolated middle tile. (E.g. with 79 kanchan + 12 penchan, discard the penchan to accept a 5, hoping to get a ryanmen.) | ||
*When discarding the 6th block, discard the weakest block you have (the one that improves tile acceptance the least). For example, if deciding between a penchan and ryanmen, discard the penchan. If you have two blocks of 23-man + 56-man, they have "duplicate acceptance" on the 4-man, so discarding one of those only leads to a loss of 4 tiles of acceptance. | *When discarding the 6th block, discard the weakest block you have (the one that improves tile acceptance the least). For example, if deciding between a penchan and ryanmen, discard the penchan. If you have two blocks of 23-man + 56-man, they have "duplicate acceptance" on the 4-man, so discarding one of those only leads to a loss of 4 tiles of acceptance. | ||
*You may want to keep 6 blocks when aiming for a yaku, such as [[pinfu]] or [[sanshoku]]. | *You may want to keep 6 blocks when aiming for a yaku, such as [[pinfu]] or [[sanshoku]]. | ||
*Sometimes, there may be multiple different ways to interpret a hand's blocks (e.g. 5568 can be seen as 556 + isolated 8, or 55 + 68). | *Sometimes, there may be multiple different ways to interpret a hand's blocks (e.g. 5568 can be seen as 556 + isolated 8, or 55 + 68). | ||
===Duplicate acceptance=== | |||
When two joints and/or isolated tiles accept the same type of tile, they become worse for tile efficiency. | |||
*A {{#mjt:45s}} ryanmen accepts ({{#mjt:36s}}). A {{#mjt:78s}} ryanmen accepts ({{#mjt:69s}}). Combined, they accept {{#mjt:369s}}, which is 4 tiles worse than having 2 separate ryanmen joints. If you happen to draw a 6, you do you get the 3-sided 45678 [[sanmenchan]], but this comes at the cost of tile efficiency. | |||
*A {{#mjt:56p}} ryanmen accepts {{#mjt:47p}}. A {{#mjt:568p}} shape also accepts {{#mjt:47p}} (and {{#mjt:58p}} if you need a pair). Therefore, the {{#mjt:8p}} isn't doing much when you have already have {{#mjt:56p}} and a stable pair elsewhere. If you don't have a pair, the 568 is decent to keep. | |||
*A lone {{#mjt:4s}} accepts {{#mjt:23456s}}. Having a lone {{#mjt:1s}} accepts {{#mjt:123s}}. Therefore, if you have {{#mjt:14s}} in your hand, the {{#mjt:1s}} is extra bad, since it only adds acceptance of 1-sou (just slightly better than a guest wind). | |||
*A {{#mjt:2233m}} shape can be treated as two separate {{#mjt:23m}} ryanmen. However, they both accept the same tiles ({{#mjt:14m}}), so doing this isn't as efficient. The shape can be decent, since it has a ryanmen wait once you reach [[tenpai]], and you can make either 2-man or 3-man into a triplet. But fishing for the [[iipeikou]] will slow down the hand. | |||
==Yaku== | ==Yaku== | ||