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Winning & Mah Jongg
False Mah Jongg
Declaring Mah Jongg with a hand that doesn't actually match any pattern on the card is a False Mah Jongg, usually caught by another player calling "Muggins."
A False Mah Jongg typically carries a penalty under house or league rules — often the offending player's hand is simply ruled dead for the rest of the round.
Example
If a player calls Mah Jongg but is missing a required pair, an opponent who spots it can call "Muggins" to challenge the claim.