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In the game of bridge, Ekren refers to a preemptive opening of 2 defined as 4-4, 4-5, 5-4 or 5-5 in the majors and 3-10 high card points. This conventional preempt was designed by Bjørn Olav Ekren from Norway and is an example of the modern style of highly aggressive preemptive bidding. ==Responses== Responses to a 2 Ekren opening:〔(Ekrens 2 preempt in The Weak Two Archive )〕 :Pass = to play (can be a tactical manoeuvre in the absence of a major suit fit and does not guarantee long diamonds) :2/ = to play :2NT = relay (invitational or stronger) :3 = natural, not forcing :3 = invitational with 3-3 in the majors :3/ = preemptive, to play :4/ = to play In responding to the 2NT relay the opener indicates whether he holds a minimum or a maximum (because of their playing strength 5-5's are generally considered maximum), and - in case of a maximum - the distribution in the majors: :3 = any minimum (responder's 3/ rebid now indicates an invite) :3 = 5-5 min or max (creates game force) :3 = 4-5 max (creates game force) :3 = 5-4 max (creates game force) :3NT = 4-4 max (creates game force) 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「Ekren convention」の詳細全文を読む スポンサード リンク
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