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CONSECUTIVE RUNS CANNOT START AT ZERO (Article 23)
4ommentary: Consecutive runs use suited tiles 1-9, and any hand that uses a consecutive run can start with any number unless “these numbers only” is stipulated in the hand description (e.g., Consecutive Run #1). The White Dragon is used as a zero only in blocks used for the year.
Question from a player: Can I use a “0” in a consecutive run?
Answer from the NMJL: A zero may never be used in a consecutive run.
Source: Mah Jongg Made Easy (2024 page 30 paragraph 6);
Other answers from the league: National Mah Jongg League Bulletin Q&A (2018)
CONSECUTIVE RUNS CANNOT START AT ZERO (Article 23)