Penchan: Difference between revisions

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-A '''penchan machi''' is a type of [[machi]], i.e., a wait shape of a [[tenpai]] hand.
+{{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.
-A penchan machi contains the tiles 1 and 2 of the same suit, or 8 and 9 of the same suit, waiting for the completion of the shuntsu with a 3 or 7.
+== Pattern ==
+{{#mjt:00000000000z12s}}, winning tile: {{#mjt:3s}}
-{{#mjt:123m055m123p99p12s}}, winning tile: {{#mjt:3s}}
 '''Penchan''' is often used for a 1-2 or 8-9 shape within the hand, even while the entire hand has not reached tenpai.
@@ Line 13: / Line 21: @@
 {{#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 4-5-6 already in place, the hand would gain 2 fu, but lose 1 han for not scoring pinfu.mm
+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}}
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 == 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.
-Penchans are [[bad shape|bad shapes]]. Only one tile will immediately make a shuntsu. It is very hard to develop them otherwise: For a 1-2 penchan, the 4 of the same suit is a useful tile, on which the 1 may be discarded. A 2-4 shape can be completed with only one tile still, or turned into the [[ryanmen]] 4-5 by drawing the 5 and possibly discarding the 2.
+*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==
+{{jpwiki|辺張}}
+{{Navbox machi}}
 [[Category:Terminology]]
-[[Category:Waits]]
+[[Category:Machi]]