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ID79-Payout for a Self-Picked Singles and Pairs Hand
Question: Is the value of a Singles and Pairs hand doubled again if you make it?
Answer: The value of a Singles and Pairs hand is not doubled because they are already jokerless with the value built into them. However, the hands would still be doubled if your Mah Jongg is self-picked.
Source: Mah Jongg Made Easy 2020, pg. 25, para. 3