Rubber bridge is a form of contract bridge, played by two competing teams of two players each. A rubber is a best-of-three competition which is completed when one team is first to win two games. A team wins a game when it is first to score 100 or more contract points; a new game ensues until one team has won two games to conclude the rubber. Owing to the availability of various additional bonus and penalty points in the scoring, it is possible though less common to win the rubber by amassing more total points despite losing two games out of three. Rubber bridge involves a high degree of skill but there is also a fair amount of luck involved in who gets the best cards.