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Payout for a Jokerless Hand (Article ID 151)
The value of a Jokerless hand is doubled. For example, if a player declares mah jongg on a hand that can use jokers but it is jokerless, the value of the hand is doubled. If the player self-picks their winning tile, the value is doubled again.
The values for hands in the Singles and Pairs category are not doubled since the value is built into the hand. In the case of a self-picked win, the value for those hands are just doubled.
Source: Mah Jongg Made Easy 2020, page 23, para. 3