card concealed in dummy
declarer and defenders did not notice dummy had only 12 cards on view. The 13th card appeared towards the end of play, Law41D describes Dummy's responsibility to display hand in a correct manner. Law 64 B3 No automatic trick adjustment following an established revoke. The B3 bit "any card belonging to dummy". After calling director, should the hand be played out and then analysed to identify any revoke before possibly applying Law 64C1 Redress of damage. Or should the problem be sorted out at the trick it was noticed? Shouldn't the players have a responsibility to notice dummy had only 12 cards showing?