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ID139-I have too Few or too Many Tiles
Question: What happens if during a game, I realized I had too few or too many tiles in my hand. Should I declare myself dead?
Answer: A player should not call their own hand dead. It is up to another player to call another player’s hand dead. One very good reason is that when a player’s hand is dead, your opponents will all get more picks from the wall.
If a player does declare their hand dead, another player must confirm that the hand is dead. If not, you just continue to play and play defensively. (See also ID78 and ID76).
Source: Mah Jongg Made Easy 2020, pg. 19, #10