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XY Notrump convention : ウィキペディア英語版 | XY Notrump convention
XY Notrump is a bidding convention in contract bridge. == Using the convention == After opener's one of a suit (X), partner's one of a suit response (Y) and opener's 1NT rebid (a very common sequence), 2 from opener's partner forces 2 from opener. Holding a weak hand with diamonds, one can now pass. Other bids are invitational, describing also the nature of the hand. A 2 response to 1NT, however, is game forcing with any hand. Responder may also jump to 3 of any suit (except 3, which is signoff) to show a slammish hand with good suit(s).
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「XY Notrump convention」の詳細全文を読む
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