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ID69-White Dragon is Considered Neutral
Question: I’ve heard a White Dragon (Soap) is also considered a neutral tile. What does this mean?
Answer: White Dragons (Soap), when represented as a zero, are considered neutral. When used as a zero, the soap isn’t considered a Dragon and isn’t required to match their partner suit. Therefore, in a grouping such as 2022, the 2s can be either Craks, Bams or Dots.
Source: Mah Jongg Made Easy 2020 page 6 para. 3