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ID106-Rolling the Dice, Breaking the Wall
Question: Why do we roll the dice to break the wall in Mah Jongg?
Answer: In all games there are rules in place to ensure fair play, and this applies to American Mah Jongg as well. Rolling the dice to break the wall is similar to cutting a deck of cards and prevents cheating. This rule is not found in Mah Jongg Made Easy.
Source: National Mah Jongg League Bulletin (2021)