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ID37-The Winning Player is Responsible for Announcing the Value of Their Hand
Question: When we are playing for money or points, who is responsible for tallying a player’s score?
Answer: A winning player is responsible for announcing the value of their hand. In the situation where the winning player forgets to include the value for a jokerless hand and another player points it out, the winning player is only paid what they initially declared.
Source: Mah Jongg Made Easy (2020 page 30 para. 11)