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Bridge Conventions (List) Used in Precision to describe a positive response with 4-4-4-1 shape after partner opens 1C. Responder first gives negative 1D response, then jumps the bidding at his/her next turn, showing the singleton.
Impossible Negative Response to 1C opening
A bidding convention is an agreement between two players on a different meaning of a bid in the card game bridge. These agreements are made so that partners can more quickly determine which contract, with both their cards, they can win together. Often, conventions are forged together into one, which is then called a bidding system.
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