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strong two clubs
Bridge bidding systems that incorporate a strong 2 clubs opening bid include modern Standard American, standard Acol, 2/1 game forcing and many others.
In most natural bridge bidding systems, the opening bid of 2 is used exclusively for hands too strong for an opening bid at the one-level. Typically, the bid is reserved for hands that are almost strong enough to bid to the game level on their own power, or even stronger. The exact requirements for the bid vary considerably depending upon the system used and partnership agreement.
In most early bidding systems,opening bids of two of a suit signified a very strong hand and were referred to as strong two bids. However, pioneer bridge inventors like Pierre Albarran and David Burnstine〔(BridgeGuys website description of strong artificial two clubs. )〕 saw that the frequency of such bids is fairly low, and that a 2 bid can be used for all strong hands, leaving other two-level opening bids for other purposes (for example, weak two bids).
==Bid requirements==
The strength requirements for the 2 bid differ slightly in different systems. In all cases they show a hand which is close to game forcing. For balanced hands, a 2 bid shows 22 or more points in Standard American (Yellow Card), and 23 or more points in standard Acol. For unbalanced hands, the typical strength is about 9 or more playing tricks, or 3 losers or less if using Losing-Trick Count.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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