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Developed by Oswald Jacoby, Jacoby 2NT is a bridge convention in which a bid of two notrump (2NT) over partner's opening bid of one heart (1) or one spade (1) shows a hand with both * opening strength (normally 12 HCP or "Rule of 20" depending upon partnership agreement) and * support of at least four cards in the opening bidder's major suit. This response is considered to be forcing to game in the suit of the opening bid. If the partnership plays splinter bids, the Jacoby 2NT response also denies a splinter (either no singleton or void, or stronger than the agreed range for a splinter bid). ==Opener's Rebids Over a Jacoby 2NT Response== With a balanced hand, opener rebids as follows:〔ACBL ("Bidding Toolbox" Article )〕 * With 16 or more HCP opener rebids three of the agreed suit. * With 14-15 HCP, the opener rebids 3NT. * With fewer than 14 HCP bids four of the agreed suit. With an unbalanced hand, there are two common methods of continuing rebidding over a Jacoby 2NT response, the choice of which is a matter of agreement between the partners. These methods differ only in the definition of a bid of another suit. 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「Jacoby 2NT」の詳細全文を読む スポンサード リンク
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