Chanta: Difference between revisions

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 By definition, every [[mentsu|tile group]] must include a [[terminal]] or [[jihai|honor]] tile. So combinations of tile groups involving 1-2-3, 7-8-9, 1-1-1, 9-9-9, and/or any honor [[jantou|pairs]]/[[koutsu|triplet]] qualify for chanta.
-===Speed===
+=== Compatibility ===
-While chanta can be seen as the converse of [[tanyao]], chanta is ''much'' slower than tanyao is. This is because the simple tiles are more [[tile efficiency|efficient]]. This can be measured by [[Ukeire|tile acceptance]] - the more tiles that can be used to form a sequence/pair/triplet, the higher the tile acceptance, and the more efficient the tile (generally) is.
+{{main|Yaku compatibility}}
+{{Yaku compatibility table|CHA}}
+Chanta's pattern is similar to [[junchan]]; however, the two can never combine as junchan implies a chanta hand. [[Honroutou]] likewise implies chanta and is thus incompatible. Chanta with [[toitoi]] or [[chiitoitsu]] actually forms honroutou instead of chanta, while chanta with [[chinitsu]] is actually junchan instead of chanta.
+Chanta is incompatible with [[tanyao]] and [[ittsu]] because both of those require a group which is not a terminal or honour -- in tanyao's case, it is required of all tiles in the hand, and for ittsu, a 4-5-6 sequence is needed.
+==Development==
+While chanta can be seen as the converse of [[tanyao]], chanta is much slower. This yaku is rarely seen in riichi mahjong, due to a few reasons:
+'''1. Smaller tile acceptance'''
+Middle tiles are more [[tile efficiency|efficient]] than terminals/honors for hand development. This can be measured by [[Ukeire|tile acceptance]] - the more tiles that can be used to form a sequence/pair/triplet, the higher the tile acceptance, and the more efficient the tile (generally) is.
 *A lone honor tile can only be used in a pair/triplet. Therefore, a lone honor only accepts itself.
-*A lone 1 accepts 1, 2, or 3. There is no way to get a [[ryanmen]] wait off with a lone 1.
+*A lone 1 accepts 1, 2, or 3. There is no way to get a ryanmen wait off with a lone 1.
 *A lone 5 accepts 3, 4, 5, 6, or 7. There are two ways to get a ryanmen wait (45, 56).
-In addition, to guarantee chanta, the hand must have a bad wait. It is possible to get a ryanmen wait with chanta, but this would be with a {23} or {78} wait. If you got a 4 or 6, respectively, chanta would be ruined.
+'''2. Cannot use [[ryanmen]] waits'''
-Since chanta is only worth 2 han (even less when open), it usually isn't worth the effort. There are many easier ways to get 2 han, such as tanyao + [[pinfu]], pinfu + 1 dora, pinfu + [[iipeikou]], and so on. Therefore, players will rarely aim for chanta. Chanta can be good to aim for when:
+A "[[ryanmen]]" is two consecutive tiles waiting to complete either side of a sequence, such as {34}, {45}, {78}. Terminals can never be part of a ryanmen shape - {12} and {89} are not ryanmen. A ryanmen has twice the acceptance as any other type of [[Machi#Basic_wait_patterns|basic wait]].
-*You need a quick hand, and chanta/junchan is your only realistic way your hand can complete open.
-*You happen to get most of the required tiles already (e.g. 123 [[sanshoku]] with other terminals/honors mixed in).
-=== Compatibility ===
+Chanta can technically can use ryanmen, via {23} and {78}. However, it is only half as effective, as you only get chanta with 1/2 of the winning tiles (1 and 9, respectively). Therefore, since chanta cannot use ryanmen, it is slower to develop than a regular hand. Plus, in order to guarantee chanta in [[tenpai]], your hand must have a bad wait (<= 4 tiles left in the wall).
-{{main|Yaku compatibility}}
-{{Yaku compatibility table|CHA}}
+'''3. Not valuable'''
-Chanta's pattern is similar to [[junchan]]; however, the two can never combine as junchan implies a chanta hand. [[Honroutou]] likewise implies chanta and is thus incompatible. Chanta with [[toitoi]] or [[chiitoitsu]] actually forms honroutou instead of chanta, while chanta with [[chinitsu]] is actually junchan instead of chanta.
+Since chanta is so slow, and only worth 2 han (even less when opened), it usually isn't worth the effort. Even without considering [[riichi]], there are easier ways to get 2 han, such as tanyao + [[pinfu]], pinfu + 1 dora, pinfu + [[iipeikou]], and so on. Therefore, players will rarely go for chanta. Chanta is even less common when [[red five]]s are used, since tanyao + 1 aka dora is already worth as much as chanta.
-Chanta is incompatible with [[tanyao]] and [[ittsu]] because both of those require a group which is not a terminal or honour -- in tanyao's case, it is required of all tiles in the hand, and for ittsu, a 4-5-6 sequence is needed.
+Chanta can be good to aim for when:
+*You need a quick hand, and chanta/junchan is your only realistic way your hand can complete open.
+*You happen to get most of the required tiles already (e.g. 123 [[sanshoku]] with other terminals/honors mixed in).
+*You were going for [[kokushi musou]], but kokushi became impossible early in the round, and you are desperate to win.
 ==External links==