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USING JOKERS IN EXPOSURES (Article 48)
Commentary: A player can use any number of jokers in a block of three or more identical tiles.
Question from a player: Can I use jokers to claim a discard to make an exposure?
Answer from the NMJL: A Joker or Jokers may be used to replace any tile or tiles in a Pung, Kong, Quint or Sextet.
Source: Mah Jongg Made Easy (2024 page 7 paragraph 1)
Other answers from the NMJL:
“A player may use her jokers and call a symbol tile, but it is a waste unless this “call and exposure” sets the hand for mah jongg.”
Source for other answers: National Mah Jongg League Bulletin Q&A (1967 page 5, 1968 page 5)
USING JOKERS IN EXPOSURES (Article 48)