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Lionel is a contract bridge bidding convention used in defense against an opposing 1NT openings. Using Lionel, over a 1NT opening of the opponents: : * a double is conventional and denotes spades and a lower suit (4-4 or longer), : * a 2/2 overcall denotes hearts and the suit bid (4-4 or longer), and : * a 2/2 overcalls is natural. Any of the overcalls denote high-card strength corresponding to 12+ (or good 11) high card points. The convention is named after Lionel Wright from New Zealand who published it in the International Popular Bridge Monthly magazine of May 1993.〔Lionel Wright, ''Lionel in Action'', International Popular Bridge Monthly, Vol. 19, No. 5 (May 1993).〕 ==Responses== Following the Lionel double, the partner of the double responds as follows: (1NT) - dbl - (pass) - ?? :pass = 10+ hcp, all subsequent doubles for penalty :2 = pass-or-correct bid (doubler to pass or bid second suit) :2 = Non-forcing, diamond length (typically 5+) with heart tolerance. Doubler can bid 2 with hearts as second suit and less than two diamonds. :2 = Natural, non-forcing :2 = Weak Raise :2NT = Invitational spade raise without a singleton side suit :3// = Invitational spade raise with singleton or void in bid suit :3 = preemptive raise After a minor suit Lionel overcall, the responses are straightforward. For instance: (1NT) - 2 - (pass) - ?? :Pass = to play :2 = to play :2 = weak raise :2 = to play :2NT = invitational heart raise :3 = preemptive :3 = preemptive 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「Lionel convention」の詳細全文を読む スポンサード リンク
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