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ID62-The Heavenly Hand and its Value
Question: What is a Heavenly Hand?
Answer: If after the tiles are dealt out, and before the Charleston begins, East player has Mah Jongg it is referred to as a Heavenly Hand. When the game ends, the winner (East) is paid double the value of the hand.
Source: Mah Jongg Made Easy (2020 page 12 The Charleston; page 14, para. 6)