When a player announces that another player’s hand should cease to be played due to a rule violation, invalid exposureWhen a player creates an exposure that would make the player’s hand dead if another player issues a dead hand… More, unwinnable handA player’s hand is impossible to complete if the remaining tile(s) the player needs to achieve their hand are not… More, or player error.
The player’s challenge should be unambiguous and loud enough so that all players can hear the declaration.