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Tile efficiency: Difference between revisions
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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: | 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]] + sequence ({{#mjt:24p}} + {{#mjt:567p}} | *{{#mjt:29p}} to create [[kanchan]] + sequence ({{#mjt:24p}} + {{#mjt:567p}}) | ||
*{{#mjt:3658p}} to create [[ryanmen]] or better ({{#mjt:34567p}} / {{#mjt:456p}} + {{#mjt:67p}}) | *{{#mjt:3658p}} to create [[ryanmen]] or better + sequence ({{#mjt:34567p}} / {{#mjt:456p}} + {{#mjt:67p}}) | ||
*{{#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 you have 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 you have 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 drops to a normal 4 or 7. | 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 drops to a normal 4 or 7. | ||
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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 2 ryanmen when used, it's great if you're going for [[pinfu]]. The chance for [[iipeikou]] also helps. If you already have all ryanmens, there's not much need to keep the bulging shape intact (discard the middle tile). | 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 2 ryanmen when used, it's great if you're going for [[pinfu]]. The chance for [[iipeikou]] also helps. If you already have all ryanmens, there's not much need to keep the bulging shape intact (discard the middle tile). | ||
Note: It's good to have a pair when you have a bulging shape. | 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. | ||
===Extended Ryankan=== | ===Extended Ryankan=== | ||