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ID109-Calling a discard that a player threw before they picked
Question: If a player discards a tile prior to picking, can another player call that tile for an exposure.
Answer: No, if a player discards before they pick, their hand should be declared dead and the discarded tile would not be available to be claimed by anyone. This ruling is not found in Mah Jongg Made Easy.
Source: National Mah Jongg League Bulletin (2022)