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Chanta: Difference between revisions
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==Development== | ==Development== | ||
While chanta can be seen as the converse of [[tanyao]], chanta is much slower. | While chanta can be seen as the converse of [[tanyao]], chanta is much slower. | ||
'''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 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 | *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). | *A lone 5 accepts 3, 4, 5, 6, or 7. There are two ways to get a ryanmen wait (45, 56). | ||
'''2. Cannot use [[ryanmen]] waits''' | |||
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 basic wait. | |||
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). | |||
'''3. Not valuable''' | |||
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 used when [[red five]]s are used, since tanyao + 1 aka dora is already worth as much aschanta. | |||
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 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 happen to get most of the required tiles already (e.g. 123 [[sanshoku]] with other terminals/honors mixed in). | ||