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Calling a discard that a player threw before they picked (Article ID 9)
Abstract: If a player discards a tile prior to picking, another player cannot call the tile for an exposure.
Question from a player: Someone threw a tile before they picked. Before the player’s hand was declared “dead” a player called the tile that was thrown. Can they claim that tile?
Answer from the NMJL: NO. You may not call a discarded tile that was thrown before a tile was picked.
Source: National Mah Jongg League Bulletin (2022)