"Farbzwang" (or "Bedienzwang") literally means "suit compulsion" and is the rule that players must follow the suit of the first card to be led to the trick, provided that they have a card of that suit. If a player does not have a card of the led suit, they may play ('discard') a card of their choice. If a player has several cards of the led suit, they may choose which to play. In most cases it makes sense to play a higher ranking card.