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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: When one player calls a tile for exposure and another player declares Mah Jongg at the same time, the player who declares Mah Jongg wins out as Mah Jongg always Trumps a call for exposure.
Source: Mah Jongg Made Easy 2024 page 18, #10 (d)