Solo Whist, sometimes known as simply Solo, is a trick-taking card game whose direct ancestor is the 17th-century Spanish game Ombre, based on the English Whist. Its major distinctive feature is that one player often plays against the other three. However, players form temporary alliances with two players playing against the other two if "Prop and Cop" is the current bid. It requires four players using a standard 52 card deck with no jokers. Aces are high and the deal, bidding and play are clockwise.