Contract bridge awards a bonus for holding a certain combination of high cards), although some are common between the two. A larger bonus is awarded if the declaring side makes a small slam or grand slam, a contract of 12 or 13 tricks respectively. If the declaring side is not vulnerable, a small slam gets 500 points, and a grand slam 1000 points. If the declaring side is vulnerable, a small slam is 750 points and a grand slam is 1,500. In rubber bridge, the rubber finishes when a partnership has won two games, but the partnership receiving the most "overall" points
Contract bridge tricks taken, the contract, and various other factors which depend to some extent on the variation of the game being played. Rubber bridge is the most popular variation for casual play, but most club and tournament play involves some variant of duplicate bridge, in which the cards are not re-dealt on each occasion, but the same deal is played by two or more sets of players (or "tables") to enable comparative scoring. For competition level, so called IMP score is of high significance. One theory is that the name "bridge" has its origins in the name of an earlier game.