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Vugraph (or Viewgraph) is a method of displaying the bidding and play of bridge hands on a screen for viewing by an audience. [1] The basis of the current computer-generated display was originally developed by Fred Gitelman for the American Contract Bridge League in 1991 under a grant from the estate of Peter Pender, a champion player.
In contract bridge, various bidding systems have been devised to enable partners to describe their hands so that they may reach the optimum contract.Key to this process is that players evaluate and re-evaluate the trick-taking potential of their hands as the auction proceeds and additional information about partner's hand and the opponent's hands becomes available.
This is a list of bidding systems used in contract bridge. [1] [2] Systems listed have either had an historical impact on the development of bidding in the game or have been or are currently being used at the national or international levels of competition. Bidding systems are characterized as belonging to one of two broadly defined categories:
For example, on the sequence 1 ♣-1 ♠ (with or without opponent's interfering);1NT-2 ♣;2 ♦,2 ♥ will show an invitational hand with minimum five spades and four hearts, 2 ♠ an invitational hand with minimum five spades (in which case one does not have four hearts) or possibly six spades with or without four hearts. 2NT will show a balanced invitational hand, 3 ♣ typically an ...
If responder has 19 or 20 HCP, then a small slam is a possibility but more information is needed about opener's hand before it should be bid. This is where a quantitative bid should be made. A bid of 4NT "invites" opener to: bid 6NT with a maximum holding of 14 HCP (19 + 14 = 33 which is sufficient) pass with a minimum 12 HCP (20+ 12 = only 32)
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Opening bids of 3 of any suit are preemptive, showing a 7+ card suit and 6-10 points (mostly inside the bid suit). The meaning of 2 ♦, 2 ♥ and 2 ♠ varies. One common usage is that the bid shows a weak two bid, similar to a preemptive bid. Another is the strong two bid, which is natural and shows a very strong hand (too strong for a 1 ...
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