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A sacrifice is a deliberate bid of a contract in duplicate bridge that is unlikely to make in the hope that the points will be less than the points likely to be gained by the opponents in making their contract. In rubber bridge, a sacrifice can be also made in an attempt to prevent the opponents scoring a game or rubber on the expectation that subsequent deals can be won to offset the loss of points. Owing to the difference in the methods of scoring, a sacrifice in rubber bridge is much less likely to be advantageous. ==Scoring context== In duplicate bridge scoring, making a game contract yields 600 or 620 points vulnerable and 400 or 420 points non-vulnerable, depending upon the and assuming no . Accordingly, a sacrifice will turn out profitable if the resultant loss in points is less than these amounts. Determination of the most number of tricks than can be lost to satisfy this condition is dependent upon the of each partnership, i.e. whether one, the other, both or neither are vulnerable. The determination is also based upon the assumption that the opposition will likely double the sacrifice bid thereby increasing the penalty points. The table at left summarises the various scenarios and outcomes. In summary, when the opponents are likely to make a game contract, a sacrifice bid is viable (i.e. one will still receive a positive relative duplicate score) if one can go down no more than 3 tricks if vulnerability is favourable, 2 if equal and 1 if unfavourable. Similar reasoning can be drawn for potential and contracts. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sacrifice (bridge)」の詳細全文を読む スポンサード リンク
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