Play then proceeds in a clockwise fashion with the high bidder having the first play of the first trick. All players must follow the lead with the same suit if possible, known as "following suit". If they do not have a domino matching the suit of the lead, they may play any domino. When led, each tile is considered to belong to the suit of its higher number, unless the tile is a trump. For example, the 4:3 domino is a 4 unless threes are trumps. The highest valued domino of the leading suit wins, unless a trump is played, in which case the highest trump wins. In any suit, the double of that suit is highest, and then the tiles are ranked by the off-suit pip.