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ID86-Simultaneous Call One for Mah Jongg and One for an Exposure
Question: If one player calls a tile and then another player declares Mah Jongg, who gets the tiles?
Answer: If one player calls a discard for exposure and another player calls that same discard for Mah Jongg, the Mah Jongg call takes precedence, even if the caller has already exposed their tiles. Mah Jongg always trumps.
Source: Mah Jongg Made Easy 2024 page 18, #10 (e)