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The support double is a bridge convention used to distinguish between 3-card and 4-card support for partner's suit response to one's opening bid in the scenario where his response is either overcalled or doubled by the opponents. A of two in partner's suit indicates four-card support and a call of double promises three-card support; if partner's suit bid is doubled instead of overcalled, a redouble serves the same meaning as double. The convention was invented by Eric Rodwell in 1974.〔Rodwell, Eric. NewInBridge - The Topics Collection; Topic 00 - Support Doubles and Redoubles. First published September 15, 2010; revised September 1, 2012.〕 For example, after 1 - (Pass) - 1 - (1) * Double shows three-card heart support * 2 shows four-card heart support * Pass or other bids: fewer than three hearts A support redouble applies when Right Hand Opponent makes a take-out double of the response of one of a major: 1 - (Pass) - 1 - (Double) * Redouble: three-card spade support * 2 shows four-card spade support * Pass or other bids: fewer than three spades The convention came as result of the scenario where in competitive auctions, the opening bidder would like to show his minimal three-card support for partner's suit on the possibility that partner has five or more cards in it. However, there would be a risk of a 4-3 fit, known as a ' which does not play as well as eight-card fits. Since the need to distinguish between three- and four-card support occurs more frequently than those cases where the opening bidder would like to make a penalty double over the opponent's 1-level overcall, the meaning of the double (and redouble) was modified to convey the conventional meaning of three-card support. ==Usage== Take the following auction: Playing support doubles, North, the opener, has shown three-card support for South's 1 call. This is important because South might only have four hearts. Based on the South no trump bid, it can be assumed that South doesn't have five or more hearts. Hand in hand with the support double is the support redouble which also shows three card support. Examine this auction, which is similar to the one above. North has shown three-card support for South's heart suit. South uses this information to form the next bid. 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「support double」の詳細全文を読む スポンサード リンク
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