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ID95-Commitment to Calling a Discard
Question: When am I committed to taking a tile I call for exposure?
Answer: A commitment to a called tile occurs when a player either takes tiles from their rack and exposes them on the flat part of their rack or places the called tile on the flat part of their rack. This ruling is not found in Mah Jongg Made Easy.
Source: National Mah Jongg League Bulletin (2023) (2020)