receive a 500-point rubber bonus above the line. Total: The scores for each side are totalled and East-West (the 'They' on the score sheet) win the rubber. Duplicate bridge Scoring in duplicate bridge is done in two stages: Each deal is scored as in rubber bridge but with some variations in methodology. The result of each deal by each partnership is compared to all other results for the same deal by all other partnerships. Scoring deals In duplicate scoring, the score for each deal is independent from all others and is a single number resulting from the addition of points awarded in accordance with either of two cases: when the contract is successful, the declaring side receives a positive score which is the sum of the following elements, if applicable: (i) contract points, (ii) overtrick points, (iii) a part-game or game bonus, (iv) a bonus for making any doubled or redoubled contract, i.e. for 'insult', and (v) a slam or grand slam bonus; the defending side receives a negative score of the same absolute value. when the contract is defeated, the defending side receives a positive score based upon the number of tricks defeated, declarer's vulnerability, and whether undoubled, doubled or redoubled; the declaring side receives a negative score of the same absolute value. Example results for a sixteen board match In duplicate bridge, the dealer and the status of vulnerability for each side is predetermined by the board, there being sixteen possible combinations. Comparing deals Matchpoint scoring One common form of pairs scoring is by matchpoints. On each , a partnership scores two matchpoints for each other partnership that scored fewer points with the same cards, and one point for each other partnership that scored the same number of points. Thus, every board is weighted equally, with the best result earning 100 percent of the matchpoints available, and the worst earning no matchpoints; the opponents receive the complement score, e.g. an 80% score for a NS pair implies a 20% score for their EW opponents. Colloquially, a maximum matchpoints score on a board is known as a "top", and a zero score is a "bottom". The terms "high board" and "low board" are also used. Note 1: Using American Contract Bridge League (ACBL) methods, scoring is one point for each pair beaten, and one-half point for each pair tied. Note 2: The rule of two matchpoints for each pair