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Tile efficiency: Difference between revisions
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| align=center| {{#mjt:4567p}} | | align=center| {{#mjt:4567p}} | ||
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It may be tempting to see the 4 or 7 as just an isolated tile. Technically, it is, but | It may be tempting to see the 4 or 7 as just an isolated tile. Technically, it is, but it can also be seen as a (45) ryanmen + (67) ryanmen. This shape accepts: | ||
*{{#mjt:29p}} to create [[kanchan]] + a sequence ({{#mjt:24p}} + {{#mjt:567p}}) | *{{#mjt:29p}} to create [[kanchan]] + a sequence ({{#mjt:24p}} + {{#mjt:567p}}) | ||
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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). | 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 | Note: When this shape contains a terminal tile (1 or 9), it becomes worse: it's equivalent to a regular 4/6 for ryanmen acceptance, though it's better at completing a pair, and you can chii to create a good shape. | ||
===Sequence + middle tile=== | ===Sequence + middle tile=== | ||
{| class="wikitable" | {| class="wikitable" | ||
! align=center| | ! align=center| Nakabukure | ||
|- | |- | ||
| align=center| {{#mjt:4556p}} | | align=center| {{#mjt:4556p}} | ||
|} | |} | ||
Like the nobetan, the "bulging" shape can be seen as a floating 5 or as (45) ryanmen + (56) ryanmen. It accepts: | Like the nobetan, the nakabukure ("bulging") shape can be seen as a floating 5 or as (45) ryanmen + (56) ryanmen. It accepts: | ||
*{{#mjt:3647p}} to create | *{{#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 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). | 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 | Note: It's good to have a pair when you have a nakabukure. Also, like the nobetan, this shape becomes much worse if it contains a terminal tile. | ||
===Extended ryankan=== | ===Extended ryankan=== | ||