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A '''penchan machi''' is a type of [[machi]], | {{infobox machi | ||
|kanji = 辺張 | |||
|english = Edge wait | |||
|fu = 2 fu | |||
|type = 1 | |||
|available = 4 | |||
|tilePattern = {{#mjt:12s}} | |||
|gameExample = [http://tenhou.net/0/?log=2014021820gm-0089-0000-70dd5966&tw=3&ts=9 Penchan] (1-2) | |||
}} | |||
A '''penchan machi''' {{kana|辺張待ち}} is a common type of [[machi|wait pattern]]. This wait pattern contains the tiles 1 and 2 of the same suit, or 8 and 9 of the same suit. The pattern is limited to waiting for the completion of the [[shuntsu]] with a 3 or 7. At maximum, only four tiles are available for completion. | |||
== Pattern == | |||
{{#mjt:00000000000z12s}}, winning tile: {{#mjt:3s}} | |||
{{#mjt: | |||
'''Penchan''' is often used for a 1-2 or 8-9 shape within the hand, even while the entire hand has not reached tenpai. | '''Penchan''' is often used for a 1-2 or 8-9 shape within the hand, even while the entire hand has not reached tenpai. | ||
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== Fu == | == Fu == | ||
Because the winning tile does not complete a shuntsu which was completable on two sides, winning from a penchan awards 2 [[fu]] to the hand and does not count as [[pinfu]]. | Because the winning tile does not complete a shuntsu which was completable on two sides, winning from a penchan awards 2 [[fu]] to the hand and does not count as [[pinfu]]. Sometimes, a winning tile can be interpreted to complete either a penchan or something else, and the higher-scoring interpretation will be used. | ||
{{#mjt:22m12345p345678s}}, winning tiles: {{#mjt:3p}} or {{#mjt:6p}} | |||
This hand qualifies for pinfu on both winning tiles. If a 3-pin is used, it is interpreted as completing the [[ryanmen]] 4-5 with the shuntsu 1-2-3 already in place. If it were interpreted as a 1-2 penchan winning with 3-pin and 3-4-5 already in place, the hand would gain 2 fu, but lose 1 han for not scoring pinfu. | |||
{{#mjt:22m12345p111s678s}}, tsumo: {{#mjt:3p}} | |||
This hand, however, will interpret the 3-pin to complete the penchan 1-2 instead of the ryanmen 4-5. It doesn't qualify for pinfu anyway because of the 1-sou ankou. This interpretation makes the hand worth 40 fu instead of 30: It has 20 base fu, 8 fu from the ankou, 2 fu for winning by tsumo, 2 fu for the penchan machi, making 32 fu in all, rounded to 40. | |||
== Strategy == | == Strategy == | ||
Penchan is considered to be a "bad wait", because it can only wait for a maximum of 4 tiles. Therefore, it is worse for [[tile efficiency|hand development]] than [[ryanmen]]. Like the other bad waits, it can be used to [[Suji#Offense|suji trap]] opponents. | |||
Both [[chanta]] and [[junchan]] often, but not always, use penchan waits. Both these yaku rely on tiles near the ends (1,2,3) and (7,8,9). | |||
===Kanchan vs Penchan=== | |||
A [[kanchan]] wait, while waiting for the same number of tiles, is considered stronger (better for efficiency) than penchan. This is because kanchans are easier to upgrade. | |||
*A {{#mjt:24p}} kanchan can be upgraded by drawing {{#mjt:5p}}, turning it into a {{#mjt:45p}} (two-sided) [[ryanmen]]. | |||
*A {{#mjt:12p}} penchan cannot be upgraded to ryanmen on its own. It must first draw a {{#mjt:4p}}, turning it into a {{#mjt:24p}} kanchan, then draw the {{#mjt:5p}} to get a ryanmen. | |||
As a penchan requires 2 tiles to be upgraded, it is inferior to keep before reaching tenpai. In addition, kanchan can be turned into a [[ryankan]] shape, while penchan cannot. However, once you reach tenpai, both kanchan and penchan become effectively identical. | |||
==External links== | ==External links== | ||
[[Category: | {{jpwiki|辺張}} | ||
{{Navbox machi}} | |||
[[Category:Terminology]] | |||
[[Category:Machi]] |
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