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Tile efficiency: Difference between revisions
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→4+ tile complex joints
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==Important concepts== | ==Important concepts== | ||
The general ideas of tile efficiency are: | The general ideas of tile efficiency are: | ||
*Discard the tiles that have the fewest amount of upgrades | *Discard the tiles that contribute the least to tile acceptance / have the fewest amount of upgrades | ||
*Try to get a good wait at [[tenpai]] | *Try to get a good wait at [[tenpai]] | ||
*Prefer ryanmen over other types of joints | *Prefer ryanmen over other types of joints | ||
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===Five-block theory=== | ===Five-block theory=== | ||
"Five-block theory" states that a standard winning hand has five "blocks" - four groups + one pair. Each joint and sequence in the hand is considered a block. | "Five-block theory" states that a standard winning hand has five "blocks" - four groups + one pair. Each joint and sequence in the hand is considered a block. Pairs are also considered a block, since they can be turned into a triplet. When a hand has 6 blocks, one of them will eventually need to be discarded. Thus, it is good to build hands with 5 blocks in mind (i.e., having 6+ blocks is redundant). | ||
Example hand split into blocks: | Example hand split into blocks: | ||
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If you have 4 pairs you might want to consider [[chiitoitsu]], but if a sequence or triplet forms, you should probably discard a pair and go for a normal hand. At 5 pairs, you're at 1-shanten for chiitoitsu, so you should likely go for that. | If you have 4 pairs you might want to consider [[chiitoitsu]], but if a sequence or triplet forms, you should probably discard a pair and go for a normal hand. At 5 pairs, you're at 1-shanten for chiitoitsu, so you should likely go for that. | ||
==4+ tile complex | ==4+ tile complex shapes== | ||
These shapes are made out of 4+ tiles. | |||
===Sequence + Sequential tile=== | ===Sequence + Sequential tile=== | ||
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*{{#mjt:47p}} to create a pair. ({{#mjt:44567p}}) | *{{#mjt:47p}} to create a pair. ({{#mjt:44567p}}) | ||
In other words, it is an ''extremely strong'' floating tile. The ryanmen acceptance is about twice that of a normal 4 or 7! Therefore, keeping this shape is very powerful if your hand's joints are not entirely composed out of ryanmen-or-better. It's also great to keep if you need a pair (even if | In other words, it is an ''extremely strong'' floating tile. The ryanmen acceptance is about twice that of a normal 4 or 7! Therefore, keeping this shape is very powerful if your hand's joints are not entirely composed out of ryanmen-or-better. It's also great to keep if you need a pair (even if your hand has all ryanmens). | ||
Note: When this shape contains a terminal tile (1 or 9), it becomes much worse. It's still good if you need a pair, but the ryanmen acceptance | Note: When this shape contains a terminal tile (1 or 9), it becomes much worse. It's still good if you need a pair, but the ryanmen acceptance is halved, equal to a regular floating tile. | ||
===Sequence + Middle tile=== | ===Sequence + Middle tile=== | ||
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|} | |} | ||
Like the nobetan, the "bulging" shape can be seen as a floating 5 | Like the nobetan, the "bulging" shape can be seen as a floating 5 or as (45) ryanmen + (56) ryanmen. It accepts: | ||
*{{#mjt:3647p}} to create [[ryanmen]] + sequence ({{#mjt:345p}} + {{#mjt:56p}} / {{#mjt:44556p}}) | *{{#mjt:3647p}} to create [[ryanmen]] + sequence ({{#mjt:345p}} + {{#mjt:56p}} / {{#mjt:44556p}}) | ||
*{{#mjt:5p}} to create a pair. ({{#mjt:456p}} + {{#mjt:55p}}) | *{{#mjt:5p}} to create a pair. ({{#mjt:456p}} + {{#mjt:55p}}) | ||
There's no kanchan, so the acceptance is slightly worse than a nobetan. However, the ryanmen acceptance is still about twice that of normal floating tiles. Because this shape nearly guarantees | There's no ability to create a kanchan, so the acceptance is slightly worse than a nobetan. However, the ryanmen acceptance is still about twice that of normal floating tiles. Because this shape nearly guarantees a ryanmen when accepting a tile, it's great if you're going for [[pinfu]]. The chance for [[iipeikou]] also helps. If your hand's joints are already ryanmen-or-better, there's not much need to keep the bulging shape intact (here, discard the middle tile). | ||
Note: It's good to have a pair when you have a bulging shape. Also, like the nobetan, this shape becomes much worse if it contains a terminal tile. | Note: It's good to have a pair when you have a bulging shape. Also, like the nobetan, this shape becomes much worse if it contains a terminal tile. | ||
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|} | |} | ||
* A {{#mjt:245679p}} can be split into ({{#mjt:24p}} + {{#mjt:567p}} + {{#mjt:9p}}) or ({{#mjt:2p}} + {{#mjt:456p}} + {{#mjt:79p}}). It combines 2 kanchan shapes, so it is essentially the same as ryankan. | |||
: It accepts {{#mjt:3p}} or {{#mjt:8p}} to complete the 2nd sequence. Drawing a {{#mjt:5p}} or {{#mjt:6p}} upgrades it to a ryanmen. | |||
* A {{#mjt:455679p}} can be seen as ({{#mjt:456p}} + {{#mjt:79p}}) or ({{#mjt:45p}} + {{#mjt:67p}} + {{#mjt:9p}}). | |||
: It accepts {{#mjt:368p}} to complete a second sequence. | |||
==Yaku== | ==Yaku== | ||