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The Carrot 1NT is a contract bridge convention, in which a 1NT opening bid shows a balanced hand 13-17 hcp. With 13-14 hcp, the opener may not have a 4-card major. With 15-17 hcp, all balanced hands (including 5-card major) may be opened 1NT. While originally developed for the Carrot Club system, this opening bid can easily be adopted in any system with a 15-17 1NT-opening. It combines the preemptive advantage of a weak 1NT-opening when opener lacks majors, with the constructive character of a strong 1NT-opening. To manage the "wide" hcp-range, a special response-structure has been designed, which distinguishes between ''weak'' invitational bids (ca 7-9 hcp, inviting the 15-17 hand only) and ''strong'' invitational bids (10-11 hcp, inviting the 13-14 hand and game-forcing to 15-17): * 2/2 are natural ''weak'' (7-9) invitations with a 5-card major. * 2NT is a ''strong'' (10-11) invitation, which may also contain 4-card major(s) (opener will only pass with 13-14, in which case he cannot have a 4-card major). * 2 is Stayman on most other hands (7-9 ''weak'' invitational, ''or'' game-forcing strength) but is also used with a 5-card major and ''strong'' invitation, 10-11. * 2 is a relay to 2 with sign-off hands or certain game-forcing hands. ==References== 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「Carrot 1NT」の詳細全文を読む スポンサード リンク
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