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Tile efficiency: Difference between revisions
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Isolated tiles, also known as "lone" or "floating" tiles, are those with no neighbors. A tile is isolated when there is no tiles numerically or categorically adjacent. Therefore, they may not be used for [[naki|tile calls]]. | Isolated tiles, also known as "lone" or "floating" tiles, are those with no neighbors. A tile is isolated when there is no tiles numerically or categorically adjacent. Therefore, they may not be used for [[naki|tile calls]]. | ||
These tiles are not very useful, so they are often discarded first. However, an isolated tile may be used to "upgrade" the hand. | These tiles are not very useful, so they are often discarded first. However, an isolated tile may be used to "upgrade" the hand. An isolated 5 can be kept to try and improve the hand's shape. An isolated [[dora]] can be kept to increase the value of the hand. An isolated [[yakuhai]] can be paired and then [[pon]]'d. | ||
===Taatsu=== | ===Taatsu=== | ||
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A hand's [[shanten]] measures how far a hand is from [[tenpai]]. A hand that is 1-shanten is 1-away from tenpai, a hand in 2-shanten is 2-away from tenpai, and so on. | A hand's [[shanten]] measures how far a hand is from [[tenpai]]. A hand that is 1-shanten is 1-away from tenpai, a hand in 2-shanten is 2-away from tenpai, and so on. | ||
[[Ukeire]], or tile acceptance, measures how many tiles can be used to reduce a hand's shanten. | [[Ukeire]], or tile acceptance, measures how many tiles can be used to reduce a hand's shanten. A hand may have a tile acceptance of 40 tiles, meaning that there are 40 different tiles ''that can be drawn'' to advance the hand. The hand may have 10, 14, 16 distinct ''types'' of tiles that improve the hand, but "tile acceptance of 40" means there are 40 tiles that can physically be drawn. | ||
Note: when measuring tile acceptance in actual games, it is important to note the amount of tiles actually available. Any tile discarded, used in your hand, used in an opponents call, or in the dora indicators can no longer be drawn, which affects the hand's tile acceptance. For example, a 67-pin ryanmen joint normally has an acceptance of 8 (four 5-pins; four 8-pins). If all four 5-pin and three of the 8-pin are discarded, the wait effectively has an acceptance of 1 tile. | Note: when measuring tile acceptance in actual games, it is important to note the amount of tiles actually available. Any tile discarded, used in your hand, used in an opponents call, or in the dora indicators can no longer be drawn, which affects the hand's tile acceptance. For example, a 67-pin ryanmen joint normally has an acceptance of 8 (four 5-pins; four 8-pins). If all four 5-pin and three of the 8-pin are discarded, the wait effectively has an acceptance of 1 tile. | ||
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The hand with 6 blocks has a better tile acceptance right now, since it can accept 28 tiles total. (Note: the 5 block hand | The hand with 6 blocks has a better tile acceptance right now, since it can accept 28 tiles total. (Note: the 5 block hand accepts the same # of ''types'' of tile, but some tiles are already in the hand, lowering acceptance.) But once a useful tile is drawn, the hand with 6 blocks has to discard one of the blocks, lowering the efficiency in the future. | ||
{| class="wikitable" | {| class="wikitable" | ||
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**You enter 1-shanten. | **You enter 1-shanten. | ||
**You have multiple kanchan/penchans and you get an isolated middle tile. (E.g. with 79 kanchan + 12 penchan & 6 blocks, discard the penchan to accept a 5, hoping to get a ryanmen.) | **You have multiple kanchan/penchans and you get an isolated middle tile. (E.g. with 79 kanchan + 12 penchan & 6 blocks, discard the penchan to accept a 5, hoping to get a ryanmen.) | ||
*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). | ||
5 block theory is always better in isolation. But, when considering opponents' actions, keeping 6 blocks can be more flexible. If somebody calls a [[kan]] on 4-pin while you have 23-pin, the 23-pin becomes much weaker, so you can discard it and be better off than if you just had 5 blocks. | |||
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. | |||
===Duplicate acceptance=== | ===Duplicate acceptance=== | ||