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After the Charleston the Game Must Continue (Article ID 120)
Abstract: Once the mandatory first and second Charleston moves have been completed the game must be played even if a player dislikes the tiles they have. Throwing one’s tiles in to request a do-over is not allowed. This ruling is not found in Mah Jongg Made Easy.
Question from a player: If one or more players’ don’t like their hand after the Charleston is over, can we throw in the tiles and start the game over?
Answer from the NMJL: “No game is ever thrown in and played over.”
Source: National Mah Jongg League Bulletin Q&A (1994 page 5) https://www.nationalmahjonggleague.org