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Japanese mahjong scoring rules: Difference between revisions
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Players are encouraged to know yaku, their han values, and how much points a given hand is worth. This knowledge may help with various game decisions, particularly when [[Riichi strategy|calling riichi]] or [[Betaori|abandoning the hand]]. | Players are encouraged to know yaku, their han values, and how much points a given hand is worth. This knowledge may help with various game decisions, particularly when [[Riichi strategy|calling riichi]] or [[Betaori|abandoning the hand]]. | ||
As a general rule, for every +1 han, the hand doubles in value until reaching 4 han. There is a "[[mangan|cap]]" at 2000 base points (5 han; 4 han 40+ fu) | As a general rule, for every +1 han, the hand roughly doubles in value until reaching 4 han. There is a "[[mangan|cap]]" at 2000 base points (5 han; 4 han 40+ fu); a hand that scores this much is called a [[mangan]] hand. Once reaching mangan, fu no longer matters for points, and han is reduced in value. | ||
=== Fu === | === Fu === | ||
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# If the hand is a [[List of yaku|yakuman]], then the hand scores 8,000 basic points. | # If the hand is a [[List of yaku|yakuman]], then the hand scores 8,000 basic points. | ||
## If double yakuman are used, a double yakuman scores 16,000 basic points. If multiple (>2) yakuman are used, points are multiplied accordingly. | ## If double yakuman are used, a double yakuman scores 16,000 basic points. If multiple (>2) yakuman are used, points are multiplied accordingly. | ||
# Otherwise, determine all of the hand's valid [[yaku]]. | # Otherwise, determine all of the hand's valid [[yaku]] and determine the amount of [[dora]]. Count the number of han from these sources. | ||
## Some [[Yaku compatibility|yaku combinations]] such as [[chanta]] + [[junchan]] are not compatible with each other. | ## Some [[Yaku compatibility|yaku combinations]] such as [[chanta]] + [[junchan]] are not compatible with each other. | ||
# If the han count is 5 or more, then counting fu is no longer necessary. The hand is scored according to its han value: | # If the han count is 5 or more, then counting fu is no longer necessary. The hand is scored according to its han value: | ||
## 5 han: mangan hand worth 2,000 base points. | ## 5 han: mangan hand worth 2,000 base points. | ||
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# If the han count is 4 or less, then count fu. | # If the han count is 4 or less, then count fu. | ||
## If the hand is not [[chiitoitsu|seven pairs]], round the fu up to the nearest 10. | ## If the hand is not [[chiitoitsu|seven pairs]], round the fu up to the nearest 10. | ||
# To get the base points, plug in the equation <code>fu | # To get the base points, plug in the equation <code>fu × 2<sup>(2 + han)</sup></code> | ||
# If playing with [[kiriage mangan]], round a 1,920-point hand up to a 2,000-point mangan. | # If playing with [[kiriage mangan]], round a 1,920-point hand up to a 2,000-point mangan. | ||
# In any case, if the base points value would be above 2,000 for a hand with 4 or fewer han, it is instead a 2,000-point mangan. | # In any case, if the base points value would be above 2,000 for a hand with 4 or fewer han, it is instead a 2,000-point mangan. | ||